From: Eddie Hung <eddie@fpgeh.com>
Date: Sat, 22 Jun 2019 21:33:47 +0000 (-0700)
Subject: Add comments to ecp5 box
X-Git-Tag: working-ls180~1237^2~52
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=6027549464bf91cee4d4bcbe9586e719dce78c80;p=yosys.git

Add comments to ecp5 box
---

diff --git a/techlibs/ecp5/abc_5g.box b/techlibs/ecp5/abc_5g.box
index 72af6d9cb..15e26b5d5 100644
--- a/techlibs/ecp5/abc_5g.box
+++ b/techlibs/ecp5/abc_5g.box
@@ -1,5 +1,11 @@
+# NB: Inputs/Outputs must be ordered alphabetically
+#     (with exceptions for carry in/out)
+
 # Box 1 : CCU2C (2xCARRY + 2xLUT4)
 # Outputs: S0, S1, COUT
+#   (NB: carry chain input/output must be last
+#        input/output and have been moved there
+#        overriding the alphabetical ordering)
 # name  ID   w/b   ins    outs
 CCU2C   1      1   9      3