FF/Latch <idex_signimm_8> (without init value) has a constant value of 0 in block

[Spacebottle]

HTE WARINGS like these:
WARNING:Xst:1710 - FF/Latch <idex_signimm_8> (without init value) has a constant value of 0 in block <mips/stage_ex>.
WARNING:Xst:1710 - FF/Latch <idex_signimm_7> (without init value) has a constant value of 0 in block <mips/stage_ex>.
WARNING:Xst:1710 - FF/Latch <idex_signimm_6> (without init value) has a constant value of 0 in block <mips/stage_ex>.
WARNING:Xst:1710 - FF/Latch <idex_signimm_5> (without init value) has a constant value of 0 in block <mips/stage_ex>.
WARNING:Xst:1710 - FF/Latch <idex_signimm_4> (without init value) has a constant value of 0 in block <mips/stage_ex>.
WARNING:Xst:1710 - FF/Latch <idex_signimm_3> (without init value) has a constant value of 0 in block <mips/stage_ex>.
WARNING:Xst:1710 - FF/Latch <idex_signimm_2> (without init value) has a constant value of 0 in block <mips/stage_ex>.
WARNING:Xst:1710 - FF/Latch <idex_signimm_1> (without init value) has a constant value of 0 in block <mips/stage_ex>.
WARNING:Xst:1710 - FF/Latch <idex_signimm_0> (without init value) has a constant value of 0 in block <mips/stage_ex>.


could someone tell what's the matter of them?

 

[joris]

I think it's simply saying that the synthesizer found out that, that particular variable/signal idex_signimm, the mentioned bits (8-0) can only have a value of 0 because of the code.
If this is truly unexpected there may be a bug in your code.