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prjxray/fuzzers/012-clbn5ffmux
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Felix Held 0d6e327229 introduce vivado wrapper 
This fixes the problem that when sourcing the vivado settings file the
library search path is modified resulting in non-vivado binaries not working
due to being dynamically linked against the vivado libraries instead of the
system ones.

Signed-off-by: Felix Held <felix-github@felixheld.de>
 		2018-12-28 19:05:49 +01:00
..
Makefile fuzzers: consolidate build scripts, move products to build dir 2018-11-07 14:28:31 -08:00
README.md Added tags for headers, subheaders and structured README files a bit 2018-02-14 12:24:18 +01:00
generate.py Make Segmaker db_root be implicit. 2018-10-22 12:04:55 -07:00
generate.sh introduce vivado wrapper 2018-12-28 19:05:49 +01:00
generate.tcl tcl: reformat existing code 2018-12-05 16:52:56 -08:00
top.py fuzzers: replace inline verilog with top_harnesS() 2018-10-23 14:27:08 -07:00

README.md

CLBn5FFMUX Fuzzer

Purpose

Document A5FFMUX family of CLB muxes

Algorithm

5FFMUX
Inputs can come from either the LUT6_2 NO5 output or the CLB NX input
To perturb the CLB the smallest, want LUT6 always instantiated
However, some routing congestion that would require putting FFs in bypass
(which turns out is actually okay, but didn't realize that at the time)
Decided instead ot instantiate LUT8, but not use the output
Turns out this is okay and won't optimize things away
So then, the 5FF D input is switched between the O5 output and an external CLB input

Outcome

Bits are one hot encoded per mux position