First pass at an external JTAG port
The verilator simulation interface uses the remote_bitbang protocol from openocd. I have a simple implementation for urjtag too. Signed-off-by: Anton Blanchard <anton@linux.ibm.com>asic-3
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-- JTAG to DMI interface, based on the Xilinx version
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--
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-- DMI bus
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--
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-- req : ____/------------\_____
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-- addr: xxxx< >xxxxx, based on the Xilinx version
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-- dout: xxxx< >xxxxx
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-- wr : xxxx< >xxxxx
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-- din : xxxxxxxxxxxx< >xxx
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-- ack : ____________/------\___
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--
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-- * addr/dout set along with req, can be latched on same cycle by slave
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-- * ack & din remain up until req is dropped by master, the slave must
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-- provide a stable output on din on reads during that time.
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-- * req remains low at until at least one sysclk after ack seen down.
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--
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-- JTAG (tck) DMI (sys_clk)
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--
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-- * jtag_req = 1
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-- (jtag_req_0) *
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-- (jtag_req_1) -> * dmi_req = 1 >
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-- *.../...
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-- * dmi_ack = 1 <
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-- * (dmi_ack_0)
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-- * <- (dmi_ack_1)
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-- * jtag_req = 0 (and latch dmi_din)
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-- (jtag_req_0) *
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-- (jtag_req_1) -> * dmi_req = 0 >
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-- * dmi_ack = 0 <
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-- * (dmi_ack_0)
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-- * <- (dmi_ack_1)
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--
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-- jtag_req can go back to 1 when jtag_rsp_1 is 0
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--
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-- Questions/TODO:
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-- - I use 2 flip fops for sync, is that enough ?
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-- - I treat the jtag_trst as an async reset, is that necessary ?
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-- - Dbl check reset situation since we have two different resets
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-- each only resetting part of the logic...
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-- - Look at optionally removing the synchronizer on the ack path,
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-- assuming JTAG is always slow enough that ack will have been
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-- stable long enough by the time CAPTURE comes in.
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-- - We could avoid the latched request by not shifting while a
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-- request is in progress (and force TDO to 1 to return a busy
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-- status).
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--
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-- WARNING: This isn't the real DMI JTAG protocol (at least not yet).
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-- a command while busy will be ignored. A response of "11"
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-- means the previous command is still going, try again.
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-- As such We don't implement the DMI "error" status, and
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-- we don't implement DTMCS yet... This may still all change
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-- but for now it's easier that way as the real DMI protocol
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-- requires for a command to work properly that enough TCK
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-- are sent while IDLE and I'm having trouble getting that
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-- working with UrJtag and the Xilinx BSCAN2 for now.
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library ieee;
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use ieee.std_logic_1164.all;
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use ieee.math_real.all;
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library work;
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use work.wishbone_types.all;
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entity dmi_dtm_jtag is
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generic(ABITS : INTEGER:=8;
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DBITS : INTEGER:=32);
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port(sys_clk : in std_ulogic;
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sys_reset : in std_ulogic;
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dmi_addr : out std_ulogic_vector(ABITS - 1 downto 0);
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dmi_din : in std_ulogic_vector(DBITS - 1 downto 0);
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dmi_dout : out std_ulogic_vector(DBITS - 1 downto 0);
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dmi_req : out std_ulogic;
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dmi_wr : out std_ulogic;
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dmi_ack : in std_ulogic;
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-- dmi_err : in std_ulogic TODO: Add error response
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jtag_tck : in std_ulogic;
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jtag_tdi : in std_ulogic;
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jtag_tms : in std_ulogic;
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jtag_trst : in std_ulogic;
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jtag_tdo : out std_ulogic
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);
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end entity dmi_dtm_jtag;
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architecture behaviour of dmi_dtm_jtag is
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-- Signals coming out of the JTAG TAP controller
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signal capture : std_ulogic;
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signal update : std_ulogic;
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signal sel : std_ulogic;
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signal shift : std_ulogic;
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signal tdi : std_ulogic;
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signal tdo : std_ulogic;
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-- ** JTAG clock domain **
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-- Shift register
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signal shiftr : std_ulogic_vector(ABITS + DBITS + 1 downto 0);
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-- Latched request
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signal request : std_ulogic_vector(ABITS + DBITS + 1 downto 0);
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-- A request is present
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signal jtag_req : std_ulogic;
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-- Synchronizer for jtag_rsp (sys clk -> jtag_tck)
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signal dmi_ack_0 : std_ulogic;
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signal dmi_ack_1 : std_ulogic;
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-- ** sys clock domain **
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-- Synchronizer for jtag_req (jtag clk -> sys clk)
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signal jtag_req_0 : std_ulogic;
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signal jtag_req_1 : std_ulogic;
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-- ** combination signals
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signal jtag_bsy : std_ulogic;
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signal op_valid : std_ulogic;
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signal rsp_op : std_ulogic_vector(1 downto 0);
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-- ** Constants **
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constant DMI_REQ_NOP : std_ulogic_vector(1 downto 0) := "00";
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constant DMI_REQ_RD : std_ulogic_vector(1 downto 0) := "01";
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constant DMI_REQ_WR : std_ulogic_vector(1 downto 0) := "10";
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constant DMI_RSP_OK : std_ulogic_vector(1 downto 0) := "00";
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constant DMI_RSP_BSY : std_ulogic_vector(1 downto 0) := "11";
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attribute ASYNC_REG : string;
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attribute ASYNC_REG of jtag_req_0: signal is "TRUE";
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attribute ASYNC_REG of jtag_req_1: signal is "TRUE";
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attribute ASYNC_REG of dmi_ack_0: signal is "TRUE";
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attribute ASYNC_REG of dmi_ack_1: signal is "TRUE";
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component tap_top port (
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-- JTAG pads
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tms_pad_i : in std_ulogic;
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tck_pad_i : in std_ulogic;
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trst_pad_i : in std_ulogic;
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tdi_pad_i : in std_ulogic;
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tdo_pad_o : out std_ulogic;
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tdo_padoe_o : out std_ulogic;
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-- TAP states
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shift_dr_o : out std_ulogic;
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pause_dr_o : out std_ulogic;
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update_dr_o : out std_ulogic;
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capture_dr_o : out std_ulogic;
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-- Select signals for boundary scan or mbist
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extest_select_o : out std_ulogic;
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sample_preload_select_o : out std_ulogic;
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mbist_select_o : out std_ulogic;
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debug_select_o : out std_ulogic;
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-- TDO signal that is connected to TDI of sub-modules.
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tdo_o : out std_ulogic;
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-- TDI signals from sub-modules
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debug_tdi_i : in std_ulogic;
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bs_chain_tdi_i : in std_ulogic;
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mbist_tdi_i : in std_ulogic
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);
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end component;
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begin
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tap_top0 : tap_top
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port map (
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tms_pad_i => jtag_tms,
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tck_pad_i => jtag_tck,
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trst_pad_i => jtag_trst,
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tdi_pad_i => jtag_tdi,
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tdo_pad_o => jtag_tdo,
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tdo_padoe_o => open, -- what to do with this?
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shift_dr_o => shift,
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pause_dr_o => open, -- what to do with this?
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update_dr_o => update,
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capture_dr_o => capture,
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-- connect boundary scan and mbist?
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extest_select_o => open,
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sample_preload_select_o => open,
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mbist_select_o => open,
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debug_select_o => sel,
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tdo_o => tdi,
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debug_tdi_i => tdo,
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bs_chain_tdi_i => '0',
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mbist_tdi_i => '0'
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);
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-- dmi_req synchronization
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dmi_req_sync : process(sys_clk)
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begin
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-- sys_reset is synchronous
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if rising_edge(sys_clk) then
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if (sys_reset = '1') then
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jtag_req_0 <= '0';
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jtag_req_1 <= '0';
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else
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jtag_req_0 <= jtag_req;
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jtag_req_1 <= jtag_req_0;
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end if;
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end if;
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end process;
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dmi_req <= jtag_req_1;
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-- dmi_ack synchronization
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dmi_ack_sync: process(jtag_tck, jtag_trst)
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begin
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-- jtag_trst is async (see comments)
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if jtag_trst = '1' then
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dmi_ack_0 <= '0';
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dmi_ack_1 <= '0';
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elsif rising_edge(jtag_tck) then
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dmi_ack_0 <= dmi_ack;
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dmi_ack_1 <= dmi_ack_0;
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end if;
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end process;
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-- jtag_bsy indicates whether we can start a new request, we can when
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-- we aren't already processing one (jtag_req) and the synchronized ack
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-- of the previous one is 0.
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--
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jtag_bsy <= jtag_req or dmi_ack_1;
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-- decode request type in shift register
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with shiftr(1 downto 0) select op_valid <=
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'1' when DMI_REQ_RD,
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'1' when DMI_REQ_WR,
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'0' when others;
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-- encode response op
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rsp_op <= DMI_RSP_BSY when jtag_bsy = '1' else DMI_RSP_OK;
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-- Some DMI out signals are directly driven from the request register
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dmi_addr <= request(ABITS + DBITS + 1 downto DBITS + 2);
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dmi_dout <= request(DBITS + 1 downto 2);
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dmi_wr <= '1' when request(1 downto 0) = DMI_REQ_WR else '0';
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-- TDO is wired to shift register bit 0
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tdo <= shiftr(0);
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-- Main state machine. Handles shift registers, request latch and
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-- jtag_req latch. Could be split into 3 processes but it's probably
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-- not worthwhile.
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--
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shifter: process(jtag_tck, jtag_trst, sys_reset)
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begin
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if jtag_trst = '1' or sys_reset = '1' then
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shiftr <= (others => '0');
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jtag_req <= '0';
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request <= (others => '0');
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elsif rising_edge(jtag_tck) then
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-- Handle jtag "commands" when sel is 1
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if sel = '1' then
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-- Shift state, rotate the register
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if shift = '1' then
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shiftr <= tdi & shiftr(ABITS + DBITS + 1 downto 1);
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end if;
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-- Update state (trigger)
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--
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-- Latch the request if we aren't already processing one and
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-- it has a valid command opcode.
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--
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if update = '1' and op_valid = '1' then
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if jtag_bsy = '0' then
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request <= shiftr;
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jtag_req <= '1';
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end if;
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-- Set the shift register "op" to "busy". This will prevent
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-- us from re-starting the command on the next update if
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-- the command completes before that.
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shiftr(1 downto 0) <= DMI_RSP_BSY;
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end if;
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-- Request completion.
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--
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-- Capture the response data for reads and clear request flag.
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--
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-- Note: We clear req (and thus dmi_req) here which relies on tck
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-- ticking and sel set. This means we are stuck with dmi_req up if
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-- the jtag interface stops. Slaves must be resilient to this.
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--
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if jtag_req = '1' and dmi_ack_1 = '1' then
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jtag_req <= '0';
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if request(1 downto 0) = DMI_REQ_RD then
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request(DBITS + 1 downto 2) <= dmi_din;
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end if;
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end if;
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-- Capture state, grab latch content with updated status
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if capture = '1' then
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shiftr <= request(ABITS + DBITS + 1 downto 2) & rsp_op;
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end if;
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end if;
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end if;
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end process;
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end architecture behaviour;
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@ -0,0 +1,640 @@
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//////////////////////////////////////////////////////////////////////
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//// ////
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//// tap_top.v ////
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//// ////
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//// ////
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//// This file is part of the JTAG Test Access Port (TAP) ////
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//// http://www.opencores.org/projects/jtag/ ////
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//// ////
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//// Author(s): ////
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//// Igor Mohor (igorm@opencores.org) ////
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//// ////
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//// ////
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//// All additional information is avaliable in the README.txt ////
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//// file. ////
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//// ////
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//////////////////////////////////////////////////////////////////////
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//// ////
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//// Copyright (C) 2000 - 2003 Authors ////
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//// ////
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//// This source file may be used and distributed without ////
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//// restriction provided that this copyright statement is not ////
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//// removed from the file and that any derivative work contains ////
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//// the original copyright notice and the associated disclaimer. ////
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//// ////
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//// This source file is free software; you can redistribute it ////
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//// and/or modify it under the terms of the GNU Lesser General ////
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//// Public License as published by the Free Software Foundation; ////
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//// either version 2.1 of the License, or (at your option) any ////
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//// later version. ////
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//// ////
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//// This source is distributed in the hope that it will be ////
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//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
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//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
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//// PURPOSE. See the GNU Lesser General Public License for more ////
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//// details. ////
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//// ////
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//// You should have received a copy of the GNU Lesser General ////
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//// Public License along with this source; if not, download it ////
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//// from http://www.opencores.org/lgpl.shtml ////
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//// ////
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//////////////////////////////////////////////////////////////////////
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//
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// CVS Revision History
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//
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// $Log: not supported by cvs2svn $
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// Revision 1.5 2004/01/18 09:27:39 simons
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// Blocking non blocking assignmenst fixed.
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//
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// Revision 1.4 2004/01/17 17:37:44 mohor
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// capture_dr_o added to ports.
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//
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// Revision 1.3 2004/01/14 13:50:56 mohor
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// 5 consecutive TMS=1 causes reset of TAP.
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//
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// Revision 1.2 2004/01/08 10:29:44 mohor
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// Control signals for tdo_pad_o mux are changed to negedge.
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//
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// Revision 1.1 2003/12/23 14:52:14 mohor
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// Directory structure changed. New version of TAP.
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//
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// Revision 1.10 2003/10/23 18:08:01 mohor
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// MBIST chain connection fixed.
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//
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// Revision 1.9 2003/10/23 16:17:02 mohor
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// CRC logic changed.
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//
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// Revision 1.8 2003/10/21 09:48:31 simons
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// Mbist support added.
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//
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// Revision 1.7 2002/11/06 14:30:10 mohor
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// Trst active high. Inverted on higher layer.
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//
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// Revision 1.6 2002/04/22 12:55:56 mohor
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// tdo_padoen_o changed to tdo_padoe_o. Signal is active high.
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//
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// Revision 1.5 2002/03/26 14:23:38 mohor
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// Signal tdo_padoe_o changed back to tdo_padoen_o.
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//
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// Revision 1.4 2002/03/25 13:16:15 mohor
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// tdo_padoen_o changed to tdo_padoe_o. Signal was always active high, just
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// not named correctly.
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//
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// Revision 1.3 2002/03/12 14:30:05 mohor
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// Few outputs for boundary scan chain added.
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//
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// Revision 1.2 2002/03/12 10:31:53 mohor
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// tap_top and dbg_top modules are put into two separate modules. tap_top
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// contains only tap state machine and related logic. dbg_top contains all
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// logic necessery for debugging.
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//
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// Revision 1.1 2002/03/08 15:28:16 mohor
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// Structure changed. Hooks for jtag chain added.
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//
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//
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//
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//
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// Top module
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module tap_top #(parameter
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// 0001 version
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// 0100100101010001 part number (IQ)
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// 00011100001 manufacturer id (flextronics)
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// 1 required by standard
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IDCODE_VALUE = 32'h149511c3,
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IR_LENGTH = 4)
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(
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// JTAG pads
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tms_pad_i,
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tck_pad_i,
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trst_pad_i,
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tdi_pad_i,
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tdo_pad_o,
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tdo_padoe_o,
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// TAP states
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shift_dr_o,
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pause_dr_o,
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update_dr_o,
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capture_dr_o,
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// Select signals for boundary scan or mbist
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extest_select_o,
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sample_preload_select_o,
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mbist_select_o,
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debug_select_o,
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// TDO signal that is connected to TDI of sub-modules.
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tdo_o,
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// TDI signals from sub-modules
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debug_tdi_i, // from debug module
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bs_chain_tdi_i, // from Boundary Scan Chain
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mbist_tdi_i // from Mbist Chain
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);
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// JTAG pins
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input tms_pad_i; // JTAG test mode select pad
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input tck_pad_i; // JTAG test clock pad
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input trst_pad_i; // JTAG test reset pad
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input tdi_pad_i; // JTAG test data input pad
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output tdo_pad_o; // JTAG test data output pad
|
||||
output tdo_padoe_o; // Output enable for JTAG test data output pad
|
||||
|
||||
// TAP states
|
||||
output shift_dr_o;
|
||||
output pause_dr_o;
|
||||
output update_dr_o;
|
||||
output capture_dr_o;
|
||||
|
||||
// Select signals for boundary scan or mbist
|
||||
output extest_select_o;
|
||||
output sample_preload_select_o;
|
||||
output mbist_select_o;
|
||||
output debug_select_o;
|
||||
|
||||
// TDO signal that is connected to TDI of sub-modules.
|
||||
output tdo_o;
|
||||
|
||||
// TDI signals from sub-modules
|
||||
input debug_tdi_i; // from debug module
|
||||
input bs_chain_tdi_i; // from Boundary Scan Chain
|
||||
input mbist_tdi_i; // from Mbist Chain
|
||||
|
||||
//Internal constants
|
||||
localparam EXTEST = 4'b0000;
|
||||
localparam SAMPLE_PRELOAD = 4'b0001;
|
||||
localparam IDCODE = 4'b0010;
|
||||
localparam DEBUG = 4'b1000;
|
||||
localparam MBIST = 4'b1001;
|
||||
localparam BYPASS = 4'b1111;
|
||||
|
||||
// Registers
|
||||
reg test_logic_reset;
|
||||
reg run_test_idle;
|
||||
reg select_dr_scan;
|
||||
reg capture_dr;
|
||||
reg shift_dr;
|
||||
reg exit1_dr;
|
||||
reg pause_dr;
|
||||
reg exit2_dr;
|
||||
reg update_dr;
|
||||
reg select_ir_scan;
|
||||
reg capture_ir;
|
||||
reg shift_ir, shift_ir_neg;
|
||||
reg exit1_ir;
|
||||
reg pause_ir;
|
||||
reg exit2_ir;
|
||||
reg update_ir;
|
||||
reg extest_select;
|
||||
reg sample_preload_select;
|
||||
reg idcode_select;
|
||||
reg mbist_select;
|
||||
reg debug_select;
|
||||
reg bypass_select;
|
||||
reg tdo_pad_o;
|
||||
reg tdo_padoe_o;
|
||||
reg tms_q1, tms_q2, tms_q3, tms_q4;
|
||||
wire tms_reset;
|
||||
|
||||
assign tdo_o = tdi_pad_i;
|
||||
assign shift_dr_o = shift_dr;
|
||||
assign pause_dr_o = pause_dr;
|
||||
assign update_dr_o = update_dr;
|
||||
assign capture_dr_o = capture_dr;
|
||||
|
||||
assign extest_select_o = extest_select;
|
||||
assign sample_preload_select_o = sample_preload_select;
|
||||
assign mbist_select_o = mbist_select;
|
||||
assign debug_select_o = debug_select;
|
||||
|
||||
|
||||
always @ (posedge tck_pad_i)
|
||||
begin
|
||||
tms_q1 <= tms_pad_i;
|
||||
tms_q2 <= tms_q1;
|
||||
tms_q3 <= tms_q2;
|
||||
tms_q4 <= tms_q3;
|
||||
end
|
||||
|
||||
|
||||
assign tms_reset = tms_q1 & tms_q2 & tms_q3 & tms_q4 & tms_pad_i; // 5 consecutive TMS=1 causes reset
|
||||
|
||||
|
||||
/**********************************************************************************
|
||||
* *
|
||||
* TAP State Machine: Fully JTAG compliant *
|
||||
* *
|
||||
**********************************************************************************/
|
||||
|
||||
// test_logic_reset state
|
||||
always @ (posedge tck_pad_i or posedge trst_pad_i)
|
||||
begin
|
||||
if(trst_pad_i)
|
||||
test_logic_reset<= 1'b1;
|
||||
else if (tms_reset)
|
||||
test_logic_reset<= 1'b1;
|
||||
else
|
||||
begin
|
||||
if(tms_pad_i & (test_logic_reset | select_ir_scan))
|
||||
test_logic_reset<= 1'b1;
|
||||
else
|
||||
test_logic_reset<= 1'b0;
|
||||
end
|
||||
end
|
||||
|
||||
// run_test_idle state
|
||||
always @ (posedge tck_pad_i or posedge trst_pad_i)
|
||||
begin
|
||||
if(trst_pad_i)
|
||||
run_test_idle<= 1'b0;
|
||||
else if (tms_reset)
|
||||
run_test_idle<= 1'b0;
|
||||
else
|
||||
if(~tms_pad_i & (test_logic_reset | run_test_idle | update_dr | update_ir))
|
||||
run_test_idle<= 1'b1;
|
||||
else
|
||||
run_test_idle<= 1'b0;
|
||||
end
|
||||
|
||||
// select_dr_scan state
|
||||
always @ (posedge tck_pad_i or posedge trst_pad_i)
|
||||
begin
|
||||
if(trst_pad_i)
|
||||
select_dr_scan<= 1'b0;
|
||||
else if (tms_reset)
|
||||
select_dr_scan<= 1'b0;
|
||||
else
|
||||
if(tms_pad_i & (run_test_idle | update_dr | update_ir))
|
||||
select_dr_scan<= 1'b1;
|
||||
else
|
||||
select_dr_scan<= 1'b0;
|
||||
end
|
||||
|
||||
// capture_dr state
|
||||
always @ (posedge tck_pad_i or posedge trst_pad_i)
|
||||
begin
|
||||
if(trst_pad_i)
|
||||
capture_dr<= 1'b0;
|
||||
else if (tms_reset)
|
||||
capture_dr<= 1'b0;
|
||||
else
|
||||
if(~tms_pad_i & select_dr_scan)
|
||||
capture_dr<= 1'b1;
|
||||
else
|
||||
capture_dr<= 1'b0;
|
||||
end
|
||||
|
||||
// shift_dr state
|
||||
always @ (posedge tck_pad_i or posedge trst_pad_i)
|
||||
begin
|
||||
if(trst_pad_i)
|
||||
shift_dr<= 1'b0;
|
||||
else if (tms_reset)
|
||||
shift_dr<= 1'b0;
|
||||
else
|
||||
if(~tms_pad_i & (capture_dr | shift_dr | exit2_dr))
|
||||
shift_dr<= 1'b1;
|
||||
else
|
||||
shift_dr<= 1'b0;
|
||||
end
|
||||
|
||||
// exit1_dr state
|
||||
always @ (posedge tck_pad_i or posedge trst_pad_i)
|
||||
begin
|
||||
if(trst_pad_i)
|
||||
exit1_dr<= 1'b0;
|
||||
else if (tms_reset)
|
||||
exit1_dr<= 1'b0;
|
||||
else
|
||||
if(tms_pad_i & (capture_dr | shift_dr))
|
||||
exit1_dr<= 1'b1;
|
||||
else
|
||||
exit1_dr<= 1'b0;
|
||||
end
|
||||
|
||||
// pause_dr state
|
||||
always @ (posedge tck_pad_i or posedge trst_pad_i)
|
||||
begin
|
||||
if(trst_pad_i)
|
||||
pause_dr<= 1'b0;
|
||||
else if (tms_reset)
|
||||
pause_dr<= 1'b0;
|
||||
else
|
||||
if(~tms_pad_i & (exit1_dr | pause_dr))
|
||||
pause_dr<= 1'b1;
|
||||
else
|
||||
pause_dr<= 1'b0;
|
||||
end
|
||||
|
||||
// exit2_dr state
|
||||
always @ (posedge tck_pad_i or posedge trst_pad_i)
|
||||
begin
|
||||
if(trst_pad_i)
|
||||
exit2_dr<= 1'b0;
|
||||
else if (tms_reset)
|
||||
exit2_dr<= 1'b0;
|
||||
else
|
||||
if(tms_pad_i & pause_dr)
|
||||
exit2_dr<= 1'b1;
|
||||
else
|
||||
exit2_dr<= 1'b0;
|
||||
end
|
||||
|
||||
// update_dr state
|
||||
always @ (posedge tck_pad_i or posedge trst_pad_i)
|
||||
begin
|
||||
if(trst_pad_i)
|
||||
update_dr<= 1'b0;
|
||||
else if (tms_reset)
|
||||
update_dr<= 1'b0;
|
||||
else
|
||||
if(tms_pad_i & (exit1_dr | exit2_dr))
|
||||
update_dr<= 1'b1;
|
||||
else
|
||||
update_dr<= 1'b0;
|
||||
end
|
||||
|
||||
// select_ir_scan state
|
||||
always @ (posedge tck_pad_i or posedge trst_pad_i)
|
||||
begin
|
||||
if(trst_pad_i)
|
||||
select_ir_scan<= 1'b0;
|
||||
else if (tms_reset)
|
||||
select_ir_scan<= 1'b0;
|
||||
else
|
||||
if(tms_pad_i & select_dr_scan)
|
||||
select_ir_scan<= 1'b1;
|
||||
else
|
||||
select_ir_scan<= 1'b0;
|
||||
end
|
||||
|
||||
// capture_ir state
|
||||
always @ (posedge tck_pad_i or posedge trst_pad_i)
|
||||
begin
|
||||
if(trst_pad_i)
|
||||
capture_ir<= 1'b0;
|
||||
else if (tms_reset)
|
||||
capture_ir<= 1'b0;
|
||||
else
|
||||
if(~tms_pad_i & select_ir_scan)
|
||||
capture_ir<= 1'b1;
|
||||
else
|
||||
capture_ir<= 1'b0;
|
||||
end
|
||||
|
||||
// shift_ir state
|
||||
always @ (posedge tck_pad_i or posedge trst_pad_i)
|
||||
begin
|
||||
if(trst_pad_i)
|
||||
shift_ir<= 1'b0;
|
||||
else if (tms_reset)
|
||||
shift_ir<= 1'b0;
|
||||
else
|
||||
if(~tms_pad_i & (capture_ir | shift_ir | exit2_ir))
|
||||
shift_ir<= 1'b1;
|
||||
else
|
||||
shift_ir<= 1'b0;
|
||||
end
|
||||
|
||||
// exit1_ir state
|
||||
always @ (posedge tck_pad_i or posedge trst_pad_i)
|
||||
begin
|
||||
if(trst_pad_i)
|
||||
exit1_ir<= 1'b0;
|
||||
else if (tms_reset)
|
||||
exit1_ir<= 1'b0;
|
||||
else
|
||||
if(tms_pad_i & (capture_ir | shift_ir))
|
||||
exit1_ir<= 1'b1;
|
||||
else
|
||||
exit1_ir<= 1'b0;
|
||||
end
|
||||
|
||||
// pause_ir state
|
||||
always @ (posedge tck_pad_i or posedge trst_pad_i)
|
||||
begin
|
||||
if(trst_pad_i)
|
||||
pause_ir<= 1'b0;
|
||||
else if (tms_reset)
|
||||
pause_ir<= 1'b0;
|
||||
else
|
||||
if(~tms_pad_i & (exit1_ir | pause_ir))
|
||||
pause_ir<= 1'b1;
|
||||
else
|
||||
pause_ir<= 1'b0;
|
||||
end
|
||||
|
||||
// exit2_ir state
|
||||
always @ (posedge tck_pad_i or posedge trst_pad_i)
|
||||
begin
|
||||
if(trst_pad_i)
|
||||
exit2_ir<= 1'b0;
|
||||
else if (tms_reset)
|
||||
exit2_ir<= 1'b0;
|
||||
else
|
||||
if(tms_pad_i & pause_ir)
|
||||
exit2_ir<= 1'b1;
|
||||
else
|
||||
exit2_ir<= 1'b0;
|
||||
end
|
||||
|
||||
// update_ir state
|
||||
always @ (posedge tck_pad_i or posedge trst_pad_i)
|
||||
begin
|
||||
if(trst_pad_i)
|
||||
update_ir<= 1'b0;
|
||||
else if (tms_reset)
|
||||
update_ir<= 1'b0;
|
||||
else
|
||||
if(tms_pad_i & (exit1_ir | exit2_ir))
|
||||
update_ir<= 1'b1;
|
||||
else
|
||||
update_ir<= 1'b0;
|
||||
end
|
||||
|
||||
/**********************************************************************************
|
||||
* *
|
||||
* End: TAP State Machine *
|
||||
* *
|
||||
**********************************************************************************/
|
||||
|
||||
|
||||
|
||||
/**********************************************************************************
|
||||
* *
|
||||
* jtag_ir: JTAG Instruction Register *
|
||||
* *
|
||||
**********************************************************************************/
|
||||
reg [IR_LENGTH-1:0] jtag_ir; // Instruction register
|
||||
reg [IR_LENGTH-1:0] latched_jtag_ir, latched_jtag_ir_neg;
|
||||
reg instruction_tdo;
|
||||
|
||||
always @ (posedge tck_pad_i or posedge trst_pad_i)
|
||||
begin
|
||||
if(trst_pad_i)
|
||||
jtag_ir[IR_LENGTH-1:0] <= {IR_LENGTH{1'b0}};
|
||||
else if(capture_ir)
|
||||
jtag_ir <= 4'b0101; // This value is fixed for easier fault detection
|
||||
else if(shift_ir)
|
||||
jtag_ir[IR_LENGTH-1:0] <= {tdi_pad_i, jtag_ir[IR_LENGTH-1:1]};
|
||||
end
|
||||
|
||||
always @ (negedge tck_pad_i)
|
||||
begin
|
||||
instruction_tdo <= jtag_ir[0];
|
||||
end
|
||||
/**********************************************************************************
|
||||
* *
|
||||
* End: jtag_ir *
|
||||
* *
|
||||
**********************************************************************************/
|
||||
|
||||
|
||||
|
||||
/**********************************************************************************
|
||||
* *
|
||||
* idcode logic *
|
||||
* *
|
||||
**********************************************************************************/
|
||||
reg [31:0] idcode_reg;
|
||||
reg idcode_tdo;
|
||||
|
||||
always @ (posedge tck_pad_i)
|
||||
begin
|
||||
if(idcode_select & shift_dr)
|
||||
idcode_reg <= {tdi_pad_i, idcode_reg[31:1]};
|
||||
else
|
||||
idcode_reg <= IDCODE_VALUE;
|
||||
end
|
||||
|
||||
always @ (negedge tck_pad_i)
|
||||
begin
|
||||
idcode_tdo <= idcode_reg[0];
|
||||
end
|
||||
/**********************************************************************************
|
||||
* *
|
||||
* End: idcode logic *
|
||||
* *
|
||||
**********************************************************************************/
|
||||
|
||||
|
||||
/**********************************************************************************
|
||||
* *
|
||||
* Bypass logic *
|
||||
* *
|
||||
**********************************************************************************/
|
||||
reg bypassed_tdo;
|
||||
reg bypass_reg;
|
||||
|
||||
always @ (posedge tck_pad_i or posedge trst_pad_i)
|
||||
begin
|
||||
if (trst_pad_i)
|
||||
bypass_reg<= 1'b0;
|
||||
else if(shift_dr)
|
||||
bypass_reg<= tdi_pad_i;
|
||||
end
|
||||
|
||||
always @ (negedge tck_pad_i)
|
||||
begin
|
||||
bypassed_tdo <= bypass_reg;
|
||||
end
|
||||
/**********************************************************************************
|
||||
* *
|
||||
* End: Bypass logic *
|
||||
* *
|
||||
**********************************************************************************/
|
||||
|
||||
|
||||
/**********************************************************************************
|
||||
* *
|
||||
* Activating Instructions *
|
||||
* *
|
||||
**********************************************************************************/
|
||||
// Updating jtag_ir (Instruction Register)
|
||||
always @ (posedge tck_pad_i or posedge trst_pad_i)
|
||||
begin
|
||||
if(trst_pad_i)
|
||||
latched_jtag_ir <= IDCODE; // IDCODE selected after reset
|
||||
else if (tms_reset)
|
||||
latched_jtag_ir <= IDCODE; // IDCODE selected after reset
|
||||
else if(update_ir)
|
||||
latched_jtag_ir <= jtag_ir;
|
||||
end
|
||||
|
||||
/**********************************************************************************
|
||||
* *
|
||||
* End: Activating Instructions *
|
||||
* *
|
||||
**********************************************************************************/
|
||||
|
||||
|
||||
// Updating jtag_ir (Instruction Register)
|
||||
always @ (latched_jtag_ir)
|
||||
begin
|
||||
extest_select = 1'b0;
|
||||
sample_preload_select = 1'b0;
|
||||
idcode_select = 1'b0;
|
||||
mbist_select = 1'b0;
|
||||
debug_select = 1'b0;
|
||||
bypass_select = 1'b0;
|
||||
|
||||
case(latched_jtag_ir) /* synthesis parallel_case */
|
||||
EXTEST: extest_select = 1'b1; // External test
|
||||
SAMPLE_PRELOAD: sample_preload_select = 1'b1; // Sample preload
|
||||
IDCODE: idcode_select = 1'b1; // ID Code
|
||||
MBIST: mbist_select = 1'b1; // Mbist test
|
||||
DEBUG: debug_select = 1'b1; // Debug
|
||||
BYPASS: bypass_select = 1'b1; // BYPASS
|
||||
default: bypass_select = 1'b1; // BYPASS
|
||||
endcase
|
||||
end
|
||||
|
||||
|
||||
|
||||
/**********************************************************************************
|
||||
* *
|
||||
* Multiplexing TDO data *
|
||||
* *
|
||||
**********************************************************************************/
|
||||
always @ (shift_ir_neg or exit1_ir or instruction_tdo or latched_jtag_ir_neg or idcode_tdo or
|
||||
debug_tdi_i or bs_chain_tdi_i or mbist_tdi_i or
|
||||
bypassed_tdo)
|
||||
begin
|
||||
if(shift_ir_neg)
|
||||
tdo_pad_o = instruction_tdo;
|
||||
else
|
||||
begin
|
||||
case(latched_jtag_ir_neg) // synthesis parallel_case
|
||||
IDCODE: tdo_pad_o = idcode_tdo; // Reading ID code
|
||||
DEBUG: tdo_pad_o = debug_tdi_i; // Debug
|
||||
SAMPLE_PRELOAD: tdo_pad_o = bs_chain_tdi_i; // Sampling/Preloading
|
||||
EXTEST: tdo_pad_o = bs_chain_tdi_i; // External test
|
||||
MBIST: tdo_pad_o = mbist_tdi_i; // Mbist test
|
||||
default: tdo_pad_o = bypassed_tdo; // BYPASS instruction
|
||||
endcase
|
||||
end
|
||||
end
|
||||
|
||||
|
||||
// Tristate control for tdo_pad_o pin
|
||||
always @ (negedge tck_pad_i)
|
||||
begin
|
||||
tdo_padoe_o <= shift_ir | shift_dr | (pause_dr & debug_select);
|
||||
end
|
||||
/**********************************************************************************
|
||||
* *
|
||||
* End: Multiplexing TDO data *
|
||||
* *
|
||||
**********************************************************************************/
|
||||
|
||||
|
||||
always @ (negedge tck_pad_i)
|
||||
begin
|
||||
shift_ir_neg <= shift_ir;
|
||||
latched_jtag_ir_neg <= latched_jtag_ir;
|
||||
end
|
||||
|
||||
|
||||
endmodule
|
||||
@ -0,0 +1,196 @@
|
||||
#include <stdint.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <unistd.h>
|
||||
#include <poll.h>
|
||||
#include <signal.h>
|
||||
#include <fcntl.h>
|
||||
#include <stdint.h>
|
||||
#include <sys/types.h>
|
||||
#include <sys/socket.h>
|
||||
#include <netinet/in.h>
|
||||
|
||||
#undef DEBUG
|
||||
|
||||
/* XXX Make that some parameter */
|
||||
#define TCP_PORT 13245
|
||||
|
||||
static int fd = -1;
|
||||
static int cfd = -1;
|
||||
|
||||
static void open_socket(void)
|
||||
{
|
||||
struct sockaddr_in addr;
|
||||
int opt, rc, flags;
|
||||
|
||||
if (fd >= 0 || fd < -1)
|
||||
return;
|
||||
|
||||
signal(SIGPIPE, SIG_IGN);
|
||||
fd = socket(AF_INET, SOCK_STREAM, 0);
|
||||
if (fd < 0) {
|
||||
fprintf(stderr, "Failed to open debug socket\r\n");
|
||||
goto fail;
|
||||
}
|
||||
|
||||
rc = 0;
|
||||
flags = fcntl(fd, F_GETFL);
|
||||
if (flags >= 0)
|
||||
rc = fcntl(fd, F_SETFL, flags | O_NONBLOCK);
|
||||
if (flags < 0 || rc < 0) {
|
||||
fprintf(stderr, "Failed to configure debug socket\r\n");
|
||||
}
|
||||
|
||||
memset(&addr, 0, sizeof(addr));
|
||||
addr.sin_family = AF_INET;
|
||||
addr.sin_port = htons(TCP_PORT);
|
||||
addr.sin_addr.s_addr = htonl(INADDR_ANY);
|
||||
opt = 1;
|
||||
setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
|
||||
rc = bind(fd, (struct sockaddr *)&addr, sizeof(addr));
|
||||
if (rc < 0) {
|
||||
fprintf(stderr, "Failed to bind debug socket\r\n");
|
||||
goto fail;
|
||||
}
|
||||
rc = listen(fd,1);
|
||||
if (rc < 0) {
|
||||
fprintf(stderr, "Failed to listen to debug socket\r\n");
|
||||
goto fail;
|
||||
}
|
||||
#ifdef DEBUG
|
||||
fprintf(stdout, "Debug socket ready\r\n");
|
||||
#endif
|
||||
return;
|
||||
fail:
|
||||
if (fd >= 0)
|
||||
close(fd);
|
||||
fd = -2;
|
||||
}
|
||||
|
||||
static void check_connection(void)
|
||||
{
|
||||
struct sockaddr_in addr;
|
||||
socklen_t addr_len = sizeof(addr);
|
||||
|
||||
cfd = accept(fd, (struct sockaddr *)&addr, &addr_len);
|
||||
if (cfd < 0)
|
||||
return;
|
||||
#ifdef DEBUG
|
||||
fprintf(stdout, "Debug client connected\r\n");
|
||||
#endif
|
||||
}
|
||||
|
||||
static bool read_one_byte(char *c)
|
||||
{
|
||||
struct pollfd fdset[1];
|
||||
int rc;
|
||||
|
||||
if (fd == -1)
|
||||
open_socket();
|
||||
if (fd < 0)
|
||||
return false;
|
||||
if (cfd < 0)
|
||||
check_connection();
|
||||
if (cfd < 0)
|
||||
return false;
|
||||
|
||||
memset(fdset, 0, sizeof(fdset));
|
||||
fdset[0].fd = cfd;
|
||||
fdset[0].events = POLLIN;
|
||||
rc = poll(fdset, 1, 0);
|
||||
if (rc <= 0)
|
||||
return false;
|
||||
rc = read(cfd, c, 1);
|
||||
if (rc != 1) {
|
||||
#ifdef DEBUG
|
||||
fprintf(stdout, "Debug read error, assuming client disconnected !\r\n");
|
||||
#endif
|
||||
close(cfd);
|
||||
cfd = -1;
|
||||
return false;
|
||||
}
|
||||
|
||||
#ifdef DEBUG
|
||||
fprintf(stdout, "Got message: %c\n", *c);
|
||||
#endif
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
static void write_one_byte(char c)
|
||||
{
|
||||
int rc;
|
||||
|
||||
#ifdef DEBUG
|
||||
fprintf(stdout, "Sending message: %c\r\n", c);
|
||||
#endif
|
||||
|
||||
rc = write(cfd, &c, 1);
|
||||
if (rc != 1) {
|
||||
#ifdef DEBUG
|
||||
fprintf(stdout, "JTAG write error, disconnecting\r\n");
|
||||
#endif
|
||||
close(cfd);
|
||||
cfd = -1;
|
||||
}
|
||||
}
|
||||
|
||||
struct jtag_in {
|
||||
uint8_t tck;
|
||||
uint8_t tms;
|
||||
uint8_t tdi;
|
||||
uint8_t trst;
|
||||
};
|
||||
|
||||
static struct jtag_in jtag_in;
|
||||
|
||||
struct jtag_in jtag_one_cycle(uint8_t tdo)
|
||||
{
|
||||
char c;
|
||||
|
||||
if (read_one_byte(&c) == false)
|
||||
goto out;
|
||||
|
||||
// Write request
|
||||
if ((c >= '0') && (c <= '7')) {
|
||||
uint8_t val = c - '0';
|
||||
|
||||
jtag_in.tck = (val >> 2) & 1;
|
||||
jtag_in.tms = (val >> 1) & 1;
|
||||
jtag_in.tdi = (val >> 0) & 1;
|
||||
|
||||
goto out;
|
||||
}
|
||||
|
||||
// Reset request
|
||||
if ((c >= 'r') && (c <= 'u')) {
|
||||
uint8_t val = c - 'r';
|
||||
|
||||
jtag_in.trst = (val >> 1) & 1;
|
||||
}
|
||||
|
||||
switch (c) {
|
||||
case 'B': // Blink on
|
||||
case 'b': // Blink off
|
||||
goto out;
|
||||
|
||||
case 'R': // Read request
|
||||
write_one_byte(tdo + '0');
|
||||
goto out;
|
||||
|
||||
case 'Q': // Quit request
|
||||
#ifdef DEBUG
|
||||
fprintf(stdout, "Disconnecting JTAG\r\n");
|
||||
#endif
|
||||
close(cfd);
|
||||
cfd = -1;
|
||||
goto out;
|
||||
|
||||
default:
|
||||
fprintf(stderr, "Unknown JTAG command %c\r\n", c);
|
||||
}
|
||||
|
||||
out:
|
||||
return jtag_in;
|
||||
}
|
||||
Loading…
Reference in New Issue