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Interfacing Spartan-3A with DSP (blackfin) board through SPI

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Hi all,

I'm working on AES implemtation in FPGA. I need to send Encrypted data's to DSP (or FFT/IFFT) through SPI port.
I have written SPI controller module in verilog. I want to know to how to calculate Set-up / Hold time to interface with DSP board SPI peripherals.?. On What basis we have to write Timing Constraints ?

Kindly help me.

Thanks,
Kumar.
 

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