Junior Member level 2
I'm new in this area. Could anybody give me some suggestion about how to decide clock strategy. My design has three clocks (all are asynchronous) and for scan , these clocks are muxed to used only one clock which is external clock. since scan clock is going to all flip-flops in scan mode, the CTS was performed in scan mode and then optimization was done in both functional and scan-mode. No timing issue seen in PrimeTime, but in functional mode one of the clock-domain has huge clock skew around 14ns. What's wrong with this , do I need to change CTS strategy to reduce this skew or should I ignore this huge skew as no timing issue seen in PT. What do you people generally do , please share.