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single-cycle mode fix on wb "wen" signal, must hold fully until ACKed
author
Luke Kenneth Casson Leighton
<lkcl@lkcl.net>
Fri, 16 Apr 2021 22:47:15 +0000
(23:47 +0100)
committer
Luke Kenneth Casson Leighton
<lkcl@lkcl.net>
Fri, 16 Apr 2021 22:47:15 +0000
(23:47 +0100)
c4m/nmigen/jtag/tap.py
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diff --git
a/c4m/nmigen/jtag/tap.py
b/c4m/nmigen/jtag/tap.py
index 5743363a5b8bc5ba007249f4c764f0742f71c844..09da1fb8f7e7f0b8f8857962a436c241272fad09 100755
(executable)
--- a/
c4m/nmigen/jtag/tap.py
+++ b/
c4m/nmigen/jtag/tap.py
@@
-789,6
+789,7
@@
class TAP(Elaboratable):
if hasattr(wb, "stall"):
m.d.comb += wb.stb.eq(fsm.ongoing("READ") |
fsm.ongoing("WRITEREAD"))
if hasattr(wb, "stall"):
m.d.comb += wb.stb.eq(fsm.ongoing("READ") |
fsm.ongoing("WRITEREAD"))
+ m.d.comb += wb.we.eq(fsm.ongoing("WRITEREAD"))
else:
# non-stall is single-cycle (litex), must assert stb
# until ack is sent
else:
# non-stall is single-cycle (litex), must assert stb
# until ack is sent
@@
-796,7
+797,6
@@
class TAP(Elaboratable):
fsm.ongoing("WRITEREAD") |
fsm.ongoing("READACK") |
fsm.ongoing("WRITEREADACK"))
fsm.ongoing("WRITEREAD") |
fsm.ongoing("READACK") |
fsm.ongoing("WRITEREADACK"))
- m.d.comb += [
- wb.cyc.eq(~fsm.ongoing("IDLE")),
- wb.we.eq(fsm.ongoing("WRITEREAD")),
- ]
+ m.d.comb += wb.we.eq(fsm.ongoing("WRITEREAD") |
+ fsm.ongoing("WRITEREADACK"))
+ m.d.comb += wb.cyc.eq(~fsm.ongoing("IDLE"))