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SPI over FMC Connector

Former Member

Hi @all
I'm planning on designing a high performance ADC/DAC Board for control applications.
The two ICs (ADC,DAC) will have SPI ports. In order to connect them to the ZedBoard, I'd like to use the FMC connector. The reason I chose FMC oder Pmod is the high clock frequency I need for the converters, which is not suitable for Pmod according to http://www.digilentinc.com/Pmods/Digilent-Pmod_%20Interface_Specification.pdf .
In the Zynq-7000 Technical Reference Manual it says, SPI can be routed to MIOs and EMIOs, but I can't figure out, which one can be routed to the FMC connector pins.
Sidequestion: I also read, that SPI_Ref_CLK must be lower than CPU_1x_CLK. Does that mean, when for example using an SPI_CLK of 35MHz, I have to limit my CPU to under 35MHZ?

Thanks for your help with this (probably stupid) question.
Greets,
Philipp

  • 0

    Hi Phillip,

    I am a newbie myself and my project also involves interfacing a high speed adc with the zedboard. Im using EVAL-Ad7961FMCZ board that is a 5MHz ADC.

    When you use a slower clock for your SPI interface that just needs a slower clock that must be applied through the clock generator. It does not affect the zedboard's main clock speed.

    I will keep you posted about my work.

    Best of luck.

    Shan