DSP48 use of P when PCOUT is used, size of PCIN AND PCOUT

[e-gore]

Hey community,

I want to cascade DSP48 slices. But what happens with the regular P output when I cascade with the PCOUT. Just put it on a signal and never use it?

Furthermore, is there a possibility to set the size of PCIN and PCOUT? The wizard choose every time the maximum size of 48 bits which I would like to avoid.

Thanks

C 

[awillen · Accepted solution]

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I want to cascade DSP48 slices. But what happens with the regular P output when I cascade with the PCOUT. Just put it on a signal and never use it?

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If you don't need it, just ignore it.

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Furthermore, is there a possibility to set the size of PCIN and PCOUT? The wizard choose every time the maximum size of 48 bits which I would like to avoid.

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No, PCOUT is routed directly to the next PCIN, there's no way to manipulate or read it.

[pedro_uno]

On the other hand, if you want to access the value on PCOUT, the P output is still available and should have exactly the same value.