Commit Graph

4 Commits (e3013f5754ccd78a5da499f0800deea661c5e27c)

Author SHA1 Message Date
Benjamin Herrenschmidt 9961d70dfb Improve PLL/MMCM clocks configuration
We can now pass both the input clock and target clock frequency
via generics. Add support for both 50Mhz and 100Mhz target freqs
for both cases.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
5 years ago
Anton Blanchard 142a722ce4 Remove names from end record statements
These are optional, and vhdlpp from iverilog barfs on them.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
5 years ago
Anton Blanchard 03fd06deaf Rework SOC reset
The old reset code was overly complicated and never worked properly.
Replace it with a simpler sequence that uses a couple of shift registers
to assert resets:

- Wait a number of external clock cycles before removing reset from
  the PLL.

- After the PLL locks and the external reset button isn't pressed,
  wait a number of PLL clock cycles before removing reset from the SOC.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
5 years ago
Olof Kindgren 12327034d6 Add and use plle2 primitive for nexys boards 5 years ago