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13 years ago

How to report Tco, Tsu, Th of a derived clock or PLL clock?

Hello,

I am using a EP2C8 device and using classic timing analysiser to check the timing relationship of my design. I used a PLL and used the PLL output as a global clock. How can I obtain the Tco, Tsu and Th related to the PLL output clock? Quartus only report these parameter related to the PLL input clock.

PLL input: 65.536M

PLL output 1: 51.2M, use as FPGA global clock

PLL output 2: 51.2M, output from PLL output pin to drive external device(SDRAM)

I want to adjust the phase relationship between PLL output 1 and PLL output 2. I can not use 51.2M clock chip directly because I had to use 65.536M clock to drive another device.

best, regard
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