From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Thu, 23 Apr 2020 17:15:17 +0000 (+0100)
Subject: comment req_done
X-Git-Tag: div_pipeline~1407
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=d359395540073305c29209c0340b9bda53c93018;p=soc.git

comment req_done
---

diff --git a/src/soc/experiment/compalu_multi.py b/src/soc/experiment/compalu_multi.py
index ad80894d..f9cb83ea 100644
--- a/src/soc/experiment/compalu_multi.py
+++ b/src/soc/experiment/compalu_multi.py
@@ -105,6 +105,8 @@ class MultiCompUnit(Elaboratable):
                     (((~self.rd.rel) | self.rd.go).all()))
 
         # write_requests all done
+        # req_done works because any one of the last of the writes
+        # is enough, when combined with when read-phase is done (rst_l.q)
         wr_any = Signal(reset_less=True)
         req_done = Signal(reset_less=True)
         m.d.comb += self.done_o.eq(self.busy_o & ~(self.wr.rel.bool()))