luke
/
nextpnr
mirror of https://github.com/YosysHQ/nextpnr.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

gowin: Add timings for BRAM 

Signed-off-by: gatecat <gatecat@ds0.me>
This commit is contained in:
gatecat 2026-02-26 14:46:25 +01:00 committed by myrtle
parent 60f02a200d
commit 84856bd669
1 changed files with 53 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
himbaechel/uarch/gowin/gowin_arch_gen.py
View File

@ -1627,6 +1627,15 @@ def create_timing_info(chip: Chip, db: chipdb.Device):
rf = int(group[3] * 1000)
return TimingValue(min(ff, fr, rf, rr), max(ff, fr, rf, rr))
def add_bram_bus_input(cell, clock, bus, width, group):
for i in range(width):
cell.add_setup_hold(clock, f"{bus}{i}", ClockEdge.RISING, group_to_timingvalue(arc[f"{group}_set"]), group_to_timingvalue(arc[f"{group}_hold"]))
def add_bram_bus_output(cell, clock, bus, width, group):
for i in range(width):
cell.add_clock_out(clock, f"{bus}{i}", ClockEdge.RISING, group_to_timingvalue(arc[group]))
speed_grades = []
for speed in db.timing.keys():
speed_grades.append(speed)
@ -1709,7 +1718,50 @@ def create_timing_info(chip: Chip, db: chipdb.Device):
dff.add_setup_hold("CLK", port, ClockEdge.FALLING, group_to_timingvalue(arc["lsr_clksetneg_asyn"]), group_to_timingvalue(arc["lsr_clkholdneg_asyn"]))
dff.add_comb_arc(port, "Q", group_to_timingvalue(arc["lsr_q"]))
elif group == "bram":
pass # TODO
for sp_type in ("SP", "SPX9"):
sp = tmg.add_cell_variant(speed, sp_type)
add_bram_bus_output(sp, "CLK", "DO", 36 if sp_type == "SPX9" else 32, "clk_do_bypass")
add_bram_bus_input(sp, "CLK", "DI", 36 if sp_type == "SPX9" else 32, "clk_di")
add_bram_bus_input(sp, "CLK", "AD", 14, "clk_ad")
add_bram_bus_input(sp, "CLK", "BLKSEL", 3, "clk_blksel")
for sig in ["CE", "WRE", "OCE", "RESET"]:
sp.add_setup_hold("CLK", sig, ClockEdge.RISING, group_to_timingvalue(arc[f"clk_{sig.lower()}_set"]), group_to_timingvalue(arc[f"clk_{sig.lower()}_hold"]))
for sdp_type in ("SDP", "SDPX9", "SDPB", "SDPX9B"):
sdp = tmg.add_cell_variant(speed, sdp_type)
add_bram_bus_output(sdp, "CLKB", "DO", 36 if sdp_type.startswith("SDPX9") else 32, "clkb_do_bypass")
add_bram_bus_input(sdp, "CLKA", "DI", 36 if sdp_type.startswith("SDPX9") else 32, "clka_di")
add_bram_bus_input(sdp, "CLKA", "ADA", 14, "clka_ada")
add_bram_bus_input(sdp, "CLKB", "ADB", 14, "clkb_adb")
add_bram_bus_input(sdp, "CLKA", "BLKSELA", 3, "clka_blksel")
add_bram_bus_input(sdp, "CLKB", "BLKSELB", 3, "clkb_blksel")
for sig in ["CEA", "WREA", "RESETA"]:
sdp.add_setup_hold("CLKA", sig, ClockEdge.RISING, group_to_timingvalue(arc[f"clka_{sig.lower()}_set"]), group_to_timingvalue(arc[f"clka_{sig.lower()}_hold"]))
for sig in ["CEB", "OCEB", "RESETB"]:
sdp.add_setup_hold("CLKB", sig, ClockEdge.RISING, group_to_timingvalue(arc[f"clkb_{sig.lower()}_set"]), group_to_timingvalue(arc[f"clkb_{sig.lower()}_hold"]))
for dp_type in ("DP", "DPX9", "DPB", "DPX9B"):
dp = tmg.add_cell_variant(speed, dp_type)
add_bram_bus_output(dp, "CLKA", "DOA", 36 if dp_type.startswith("DPX9") else 32, "clka_doa_bypass")
add_bram_bus_output(dp, "CLKB", "DO", 36 if dp_type.startswith("DPX9") else 32, "clkb_dob_bypass")
add_bram_bus_input(dp, "CLKA", "DIA", 36 if dp_type.startswith("DPX9") else 32, "clka_dia")
add_bram_bus_input(dp, "CLKB", "DIB", 36 if dp_type.startswith("DPX9") else 32, "clkb_dib")
add_bram_bus_input(dp, "CLKA", "ADA", 14, "clka_ada")
add_bram_bus_input(sp, "CLKB", "ADB", 14, "clkb_adb")
add_bram_bus_input(dp, "CLKA", "BLKSELA", 3, "clka_blksel")
add_bram_bus_input(dp, "CLKB", "BLKSELB", 3, "clkb_blksel")
for sig in ["CEA", "OCEA", "WREA", "RESETA"]:
dp.add_setup_hold("CLKA", sig, ClockEdge.RISING, group_to_timingvalue(arc[f"clka_{sig.lower()}_set"]), group_to_timingvalue(arc[f"clka_{sig.lower()}_hold"]))
for sig in ["CEB", "OCEB", "WREB", "RESETB"]:
dp.add_setup_hold("CLKB", sig, ClockEdge.RISING, group_to_timingvalue(arc[f"clkb_{sig.lower()}_set"]), group_to_timingvalue(arc[f"clkb_{sig.lower()}_hold"]))
elif group == "fanout":
pass # handled in "wire"
elif group == "glbsrc":