How to write DC constraint scripts for RGMII IP CORE

[tavidu]

rgmii waveform

I'v designed RGMII IP CORE
but I really dont know how to write dc constraits script of design compiler, because
RGMII use rising&falling edge of a clock.

Anyone can give me any suggestion?

Thanks

 

[utmseng]

Re: dc scripts of RGMII

Hi,

Can you describe more on your design's clock waveform? I thought DC's create_clock is able to constraint your design. You can man create_clock to take a closer look.

 

[ami]

Re: dc scripts of RGMII

1. Define input clock.
2. Set_input_delay with respect to rising edge of the clock.
3. Set_input_delay with respect to falling edge of the clock using “-clock_fall” switch.

Use similar rule for output timing constraints.