From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Tue, 4 Aug 2020 15:04:43 +0000 (+0100)
Subject: allow instruction to run if initiated whilst "stopped" requested
X-Git-Tag: semi_working_ecp5~451
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=6a8960189546bef1887422964049b97d0dc15d98;p=soc.git

allow instruction to run if initiated whilst "stopped" requested
---

diff --git a/src/soc/simple/core.py b/src/soc/simple/core.py
index 3b195d24..fb341b10 100644
--- a/src/soc/simple/core.py
+++ b/src/soc/simple/core.py
@@ -129,9 +129,6 @@ class NonProductionCore(Elaboratable):
         fu_bitdict = {}
         for i, funame in enumerate(fus.keys()):
             fu_bitdict[funame] = fu_enable[i]
-        # only run when allowed and when instruction is valid
-        can_run = Signal(reset_less=True)
-        comb += can_run.eq(self.ivalid_i & ~self.core_stopped_i)
 
         # enable the required Function Unit based on the opcode decode
         # note: this *only* works correctly for simple core when one and
@@ -148,7 +145,7 @@ class NonProductionCore(Elaboratable):
             sync += counter.eq(counter - 1)
             comb += self.busy_o.eq(1)
 
-        with m.If(can_run):
+        with m.If(self.ivalid_i): # run only when valid
             with m.Switch(dec2.e.do.insn_type):
                 # check for ATTN: halt if true
                 with m.Case(MicrOp.OP_ATTN):