137 lines
4.6 KiB
Verilog
137 lines
4.6 KiB
Verilog
// © IBM Corp. 2020
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// Licensed under the Apache License, Version 2.0 (the "License"), as modified by
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// the terms below; you may not use the files in this repository except in
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// compliance with the License as modified.
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// You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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//
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// Modified Terms:
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//
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// 1) For the purpose of the patent license granted to you in Section 3 of the
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// License, the "Work" hereby includes implementations of the work of authorship
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// in physical form.
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//
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// 2) Notwithstanding any terms to the contrary in the License, any licenses
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// necessary for implementation of the Work that are available from OpenPOWER
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// via the Power ISA End User License Agreement (EULA) are explicitly excluded
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// hereunder, and may be obtained from OpenPOWER under the terms and conditions
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// of the EULA.
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//
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// Unless required by applicable law or agreed to in writing, the reference design
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// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License
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// for the specific language governing permissions and limitations under the License.
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//
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// Additional rights, including the ability to physically implement a softcore that
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// is compliant with the required sections of the Power ISA Specification, are
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// available at no cost under the terms of the OpenPOWER Power ISA EULA, which can be
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// obtained (along with the Power ISA) here: https://openpowerfoundation.org.
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`timescale 1 ns / 1 ns
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// Description: XU CPL - Configurable Flush Delay Counter
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//
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//*****************************************************************************
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`include "tri_a2o.vh"
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module xu_fctr
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#(
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parameter CLOCKGATE = 1,
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parameter PASSTHRU = 1,
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parameter DELAY_WIDTH = 4,
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parameter WIDTH = 2
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)
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(
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input clk,
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input rst,
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input force_t,
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input thold_b,
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input sg,
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input d_mode,
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input delay_lclkr,
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input mpw1_b,
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input mpw2_b,
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input scin,
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output scout,
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input [0:WIDTH-1] din,
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output [0:WIDTH-1] dout,
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input [0:DELAY_WIDTH-1] delay,
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inout vdd,
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inout gnd
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);
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// Latches
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wire [0:DELAY_WIDTH-1] delay_q[0:WIDTH-1];
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wire [0:DELAY_WIDTH-1] delay_d[0:WIDTH-1];
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// Scanchains
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localparam delay_offset = 0;
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localparam scan_right = delay_offset + DELAY_WIDTH*WIDTH;
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wire [0:scan_right-1] siv;
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wire [0:scan_right-1] sov;
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// Signals
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wire [0:WIDTH-1] set;
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wire [0:WIDTH-1] zero_b;
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wire [0:WIDTH-1] act;
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generate
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genvar t;
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for (t=0;t<=WIDTH-1;t=t+1)
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begin : threads_gen
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wire [0:DELAY_WIDTH-1] delay_m1;
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assign set[t] = din[t];
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assign zero_b[t] = |(delay_q[t]);
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assign delay_m1 = delay_q[t] - {{DELAY_WIDTH-1{1'b0}},1'b1};
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if (CLOCKGATE == 0) begin : clockgate_0
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assign act[t] = set[t] | zero_b[t];
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assign delay_d[t] = ({set[t], zero_b[t]} == 2'b11) ? delay :
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({set[t], zero_b[t]} == 2'b10) ? delay :
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({set[t], zero_b[t]} == 2'b01) ? delay_m1 :
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delay_q[t];
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end
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if (CLOCKGATE == 1) begin : clockgate_1
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assign act[t] = set[t] | zero_b[t];
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assign delay_d[t] = (set[t] == 1'b1) ? delay :
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delay_m1;
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end
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if (PASSTHRU == 1)begin : PASSTHRU_gen_1
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assign dout[t] = zero_b[t] | din[t];
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end
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if (PASSTHRU == 0) begin : PASSTHRU_gen_0
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assign dout[t] = zero_b[t];
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end
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tri_rlmreg_p #(.WIDTH(DELAY_WIDTH), .INIT(0), .NEEDS_SRESET(1)) delay_latch(
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.clk(clk),
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.rst(rst),
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.vd(vdd),
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.gd(gnd),
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.act(act[t]),
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.force_t(force_t),
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.d_mode(d_mode),
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.delay_lclkr(delay_lclkr),
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.mpw1_b(mpw1_b),
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.mpw2_b(mpw2_b),
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.thold_b(thold_b),
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.sg(sg),
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.scin(siv[delay_offset+DELAY_WIDTH*t:delay_offset+DELAY_WIDTH*(t+1)-1]),
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.scout(sov[delay_offset+DELAY_WIDTH*t:delay_offset+DELAY_WIDTH*(t+1)-1]),
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.din(delay_d[t]),
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.dout(delay_q[t])
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);
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end
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endgenerate
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assign siv[0:scan_right - 1] = {sov[1:scan_right - 1], scin};
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assign scout = sov[0];
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endmodule
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