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Limit outstanding range

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outstanding can only ever be -1 to 2 at the moment (0 or 1 on a
rising clock edge). Vivado is synthesizing a much wider adder
which is silly. Constrain it with a range statement. This should
be good for timing and saves us about 85 LUTs.

This will get relaxed when we add more pipelining, but only by a
few bits.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
This commit is contained in:
Anton Blanchard
2019-10-10 17:14:55 +11:00
committed by Anton Blanchard
parent 3c6e66dc96
commit 4016f69e70
1 changed files with 1 additions and 1 deletions
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decode2.vhdl
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@@ -40,7 +40,7 @@ architecture behaviour of decode2 is
type reg_internal_type is record
state : state_type;
outstanding : integer;
outstanding : integer range -1 to 2;
end record;
type reg_type is record