From: Eddie Hung <eddie@fpgeh.com>
Date: Sat, 22 Jun 2019 21:28:24 +0000 (-0700)
Subject: Add comment to xc7 box
X-Git-Tag: working-ls180~1237^2~53
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=792d0670c3bfe5af7946c6deb0df4656b820d195;p=yosys.git

Add comment to xc7 box
---

diff --git a/techlibs/xilinx/abc_xc7.box b/techlibs/xilinx/abc_xc7.box
index 0a6a6eaf0..b5817a6e0 100644
--- a/techlibs/xilinx/abc_xc7.box
+++ b/techlibs/xilinx/abc_xc7.box
@@ -1,5 +1,8 @@
 # Max delays from https://github.com/SymbiFlow/prjxray-db/blob/34ea6eb08a63d21ec16264ad37a0a7b142ff6031/artix7/timings/CLBLL_L.sdf
 
+# NB: Inputs/Outputs must be ordered alphabetically
+#     (with exceptions for carry in/out)
+
 # F7BMUX slower than F7AMUX
 # Inputs: I0 I1 S0
 # Outputs: O