[Q] DSP & MCU DFT method?

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I am confused about the DFT method in DSP or MCU/CPU design. In mod CPU design, employ custom design method. There is no standard clock, in GHz design.
There are just many phase signal as traditional clcok.
Anyone know this?
 

what is phase signal ?
 

The clock is not always on. Just give the posedge or negedge of the clock in some conditions. I know they will emply functional pattern, or BIST to running test.
Another, how to do DFT IN FPGA chip. Before vendor shipping the chip, chip test should be done. We can make scan chain in FPGA? I don't think so.
I want to know detail about this.
 

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