Synthesis

[atashsa_b]

how can remove these warning?

why they occur?

NING:Xst:1895 - Due to other FF/Latch trimming, FF/Latch <_mux0003_0> (without init value) has a constant value of 1 in block <Find_Min_Values_one_row>. This FF/Latch will be trimmed during the optimization process.
WARNING:Xst:1895 - Due to other FF/Latch trimming, FF/Latch <_mux0005_0> (without init value) has a constant value of 1 in block <Find_Min_Values_one_row>. This FF/Latch will be trimmed during the optimization process.
WARNING:Xst:1895 - Due to other FF/Latch trimming, FF/Latch <_mux0006_0> (without init value) has a constant value of 1 in block <Find_Min_Values_one_row>. This FF/Latch will be trimmed during the optimization process.
WARNING:Xst:1895 - Due to other FF/Latch trimming, FF/Latch <_mux0007_0> (without init value) has a constant value of 1 in block <Find_Min_Values_one_row>. This FF/Latch will be trimmed during the optimization process.
WARNING:Xst:1710 - FF/Latch <_mux0002_0> (without init value) has a constant value of 1 in block <Find_Min_Values_one_row>. This FF/Latch will be trimmed during the optimization process.
WARNING:Xst:1895 - Due to other FF/Latch trimming, FF/Latch <_mux0000_0> (without init value) has a constant value of 1 in block <Find_Min_Values_one_row>. This FF/Latch will be trimmed during the optimization process.
WARNING:Xst:1895 - Due to other FF/Latch trimming, FF/Latch <_mux0001_0> (without init value) has a constant value of 1 in block <Find_Min_Values_one_row>. This FF/Latch will be trimmed during the optimization process.
WARNING:Xst:1895 - Due to other FF/Latch trimming, FF/Latch <_mux0003_0> (without init value) has a constant value of 1 in block <Find_Min_Values_one_row>. This FF/Latch will be trimmed during the optimization process.
WARNING:Xst:1895 - Due to other FF/Latch trimming, FF/Latch <_mux0004_0> (without init value) has a constant value of 1 in block <Find_Min_Values_one_row>. This FF/Latch will be trimmed during the optimization process.
WARNING:Xst:1895 - Due to other FF/Latch trimming, FF/Latch <_mux0005_0> (without init value) has a constant value of 1 in block <Find_Min_Values_one_row>. This FF/Latch will be trimmed during the optimization process.
WARNING:Xst:1895 - Due to other FF/Latch trimming, FF/Latch <_mux0006_0> (without init value) has a constant value of 1 in block <Find_Min_Values_one_row>. This FF/Latch will be trimmed during the optimization process.
WARNING:Xst:1895 - Due to other FF/Latch trimming, FF/Latch <_mux0007_0> (without init value) has a constant value of 1 in block <Find_Min_Values_one_row>. This FF/Latch will be trimmed during the optimization process.
WARNING:Xst:1293

[rcingham]

> why they occur?

Because the code for 'Find_Min_Values_one_row' is inefficient or generalised.
Did you write it?
If it is part of some IP, you will just have to put up with the warnings.

[sauravs]

hi,

trimming means signal is left unconnected/ undriven/ unloaded. to avoid trimming i suggest you to use " keep " / " save " attribute on that signal.

to use that attribute refer synthesis constraint guide.

[vemulad]

Hi,

From the error message, it appears that the input of the flip flop has been driven to constant value. This may be due to coding or it may occur if some other logic driving this flip flop gets trimmed.

XST trims the flip flops that are unconnected / driven to constant values. This can be avoided by using save flag. This saves the flipflop as well as the net connected to it from trimming.

Thanks,

Deepika.