FF/Latch Trimming : Xilinx ISE 6.3i

[erjs]

HI,
I'm doing an AES code.
In one of the blocks i'm setting a value to a constant

[snip]
4'h0: rcon_func=32'h01_00_00_00;
[snip]

When synthesizing this ocde,the bits [23:0] are being trimmed out
leading to wiping out a whole bunch of further data mappings.

Any suggestions on how to get the ISe not to trip latches or a better
way of declaring the values.

erjs

 

[Jason Zheng]

erjs wrote:

HI,
I'm doing an AES code.
In one of the blocks i'm setting a value to a constant

[snip]
4'h0: rcon_func=32'h01_00_00_00;
[snip]

When synthesizing this ocde,the bits [23:0] are being trimmed out
leading to wiping out a whole bunch of further data mappings.

Any suggestions on how to get the ISe not to trip latches or a better
way of declaring the values.

erjs

post the whole block if you can?