From d71e93117005592c53b8bff7651b7ad934dde871 Mon Sep 17 00:00:00 2001
From: Erik Kooistra <kooistra@astron.nl>
Date: Thu, 5 Feb 2015 13:34:18 +0000
Subject: [PATCH] Added 100o) Conditional include of IP libraries to avoid
Quartus exit due to missing IP signals
---
tools/hdltool_readme.txt | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/tools/hdltool_readme.txt b/tools/hdltool_readme.txt
index 24daacaa8c..ee4ad315d9 100644
--- a/tools/hdltool_readme.txt
+++ b/tools/hdltool_readme.txt
@@ -695,7 +695,21 @@ m) (FIXED) Issue exit error when a library name occurs double
n) Rename modelsim_compile_ip_files into more precise name eg. modelsim_execute or modelsim_pre_execute
-
+o) Conditional include of IP libraries to avoid Quartus exit due to missing IP signals
+ Quartus can exit with error if IP is included in the hdl_lib_uses list of libraries but not actually used in
+ the design, eg due to a sdc file that is then sourced but that cannot find some IP signals.
+ If the error is changed into warning then Quartus continues. Such modification of the sdc file could be automated
+ by using 'sed' to edit the sdc after it was generated by generate_ip.tcl.
+ In some designs we want to be able to temporarily disable the synthesis of an IO component (eg. io_ddr) to reduce
+ synthesis time. In that case the Quartus should not need to source the qip and sdc settings for that IP. It
+ would be sufficient to only source an io_ddr entity with empty architecture. We already have the revision capability
+ for designs and this could also be applied to IO libraries. Still the question remains how select between using
+ the component declaration only library when it is not used for synthesis and how to include the full library when
+ it is used for synthesis. This could be done if the io_ddr library is only included at the design level, because
+ then the design that uses the io_ddr has hdl_lib_uses = io_ddr in its hdllib.cfg whereas the design that does not
+ use io_ddr should in have hdl_lib_uses = io_ddr_empty, where io_ddr_empty is a revision of io_ddr with only the
+ entity and an emtpy architecture.
+
101) More ideas
--
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