Warning - hold time violation found in a path from clock

Anonymous · ‎Jul 05, 2015

Hi,

I'm trying to build my project, but I get the following error which I can't seem to solve:

sta.M0019: hold time violation found in a path from clock (cyBUS_clk) to clock (Pin_5(0)_ SYNC/OUT)

My project includes 1 SPI master and another (not related) SPI slave blocks.

I suspect the problem is due to the SPI slave which is controlled by an outside clock.

I've attached my project top design schematics.

Thanks in advance,

Igal Nudelman

Bob_Marlowe · ‎Jul 05, 2015

Welcome in the forum, Igal.

Your SPIS component's MOSI-pin (Pin_4) uses double sync at its input that is causing the warning. When set to none (no syncing) the warning passes.

Additionally: I would suggest to use an internal clock, since there is no need in your case for an external one on Pin_33. This clock is not controlling the bit-rate, it is for the component's internal updating of the states.

Bob

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Warning - hold time violation found in a path from clock

Warning - hold time violation found in a path from clock

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