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Observer
Observer
3,109 Views
Registered: ‎05-02-2013

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

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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

 

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Mentor
Mentor
3,982 Views
Registered: ‎11-29-2007

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?

If you don't need it, just ignore 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.

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



Please google your question before asking it.
If someone answers your question, mark the post with "Accept as solution". If you see a particularly good and informative post, consider giving it Kudos (the star on the left).

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Mentor
Mentor
3,983 Views
Registered: ‎11-29-2007

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?

If you don't need it, just ignore 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.

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



Please google your question before asking it.
If someone answers your question, mark the post with "Accept as solution". If you see a particularly good and informative post, consider giving it Kudos (the star on the left).

View solution in original post

Advisor
Advisor
1,652 Views
Registered: ‎02-12-2013
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.
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DSP in hardware and software
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