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soc/cores/jtag: Add p_INIT/p_init workaround on ECP5JTAG to support Diamond and Trellis toolchains without manual changes.

This commit is contained in:
Florent Kermarrec 2024-11-04 12:40:39 +01:00
parent 4368d5a9ed
commit 175e63ac4c
1 changed files with 5 additions and 1 deletions
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6
litex/soc/cores/jtag.py
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@ -373,13 +373,17 @@ class ECP5JTAG(LiteXModule):
i_JTDO1 = self.tdo, # FF(negedge TCK, JTDO1) if (IR==0x32 && FSM==Shift-DR) i_JTDO1 = self.tdo, # FF(negedge TCK, JTDO1) if (IR==0x32 && FSM==Shift-DR)
) )
# NextPnr/Diamond LUT4 p_INIT/p_init workaround.
from litex.build.lattice.diamond import LatticeDiamondToolchain
p_init_name = {False: "p_INIT", True: "p_init"}[isinstance(LiteXContext.toolchain, LatticeDiamondToolchain)]
# TDI/TCK are synchronous on JTAGG output (TDI being registered with TCK). Introduce a delay # TDI/TCK are synchronous on JTAGG output (TDI being registered with TCK). Introduce a delay
# on TCK with multiple LUT4s to allow its use as the JTAG Clk. # on TCK with multiple LUT4s to allow its use as the JTAG Clk.
for i in range(tck_delay_luts): for i in range(tck_delay_luts):
new_tck = Signal() new_tck = Signal()
self.specials += Instance("LUT4", self.specials += Instance("LUT4",
attr = {"keep"}, attr = {"keep"},
p_INIT = 2, **{f"p_{p_init_name}": 2}, # Use toolchain-specific INIT parameter name.
i_A = tck, i_A = tck,
i_B = 0, i_B = 0,
i_C = 0, i_C = 0,