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PicoZed SDR Software-Defined Radio Negative Slack

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Negative Slack

ags1 over 8 years ago

I have a design (an IP) which is working fine with ZC706 but the same design is giving me a negative slack problem when used with PicoZed.

Please let me know the difference between the two on functional level.

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0 drozwood90 over 8 years ago

Hi there,

Which PicoZed?
We have some that use Artix fabric (PicoZed 7010,7015,7020). We also have one that uses Kintex Fabric (PicoZed 7030).

If you are moving from a ZC706 (which uses a Zynq 7045 device), you have Kintex fabric.
https://www.xilinx.com/products/boards-and-kits/ek-z7-zc706-g.html

The Kintex fabric is faster. If your constraints are not 100% solid, you can certainly see issues like this. If your constraints are 100%, the tools will adjust the timing paths in order to account for the differences in fabric speed.

This is especially true running a lot of asynchronous latching.

--Dan
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0 drozwood90 over 8 years ago

Hi there,

Which PicoZed?
We have some that use Artix fabric (PicoZed 7010,7015,7020). We also have one that uses Kintex Fabric (PicoZed 7030).

If you are moving from a ZC706 (which uses a Zynq 7045 device), you have Kintex fabric.
https://www.xilinx.com/products/boards-and-kits/ek-z7-zc706-g.html

The Kintex fabric is faster. If your constraints are not 100% solid, you can certainly see issues like this. If your constraints are 100%, the tools will adjust the timing paths in order to account for the differences in fabric speed.

This is especially true running a lot of asynchronous latching.

--Dan
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