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Observer bobbyl
Observer
545 Views
Registered: ‎10-24-2018

SPI pins

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Where can I find which pins to put in the constraints file to use the SPI interface post-configuration? I'm using an XC7A50T-2CSG325 on a PicoEVB board.

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Accepted Solutions
491 Views
Registered: ‎01-22-2015

Re: SPI pins

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@bobbyl

The schematics that came with your board should identify the FPGA pins that you need. 

For example, the schematic found <here> might be for your board.  I assume you are referring to the SPI interface that connects the FPGA to the Flash memory, U2? 
PicoEVB.jpg

For this interface, the schematic shows that the FPGA pins (K16, L17, J15, J16, L15, and FPGA_CCLK_O_B) are used.  In your HDL, you can access all these pins directly except FPGA_CCLK_O_B, which must be accessed via the STARTUPE2 primitive (port USRCCLKO) described on about page 595 of UG953.

Cheers,
Mark

3 Replies
492 Views
Registered: ‎01-22-2015

Re: SPI pins

Jump to solution

@bobbyl

The schematics that came with your board should identify the FPGA pins that you need. 

For example, the schematic found <here> might be for your board.  I assume you are referring to the SPI interface that connects the FPGA to the Flash memory, U2? 
PicoEVB.jpg

For this interface, the schematic shows that the FPGA pins (K16, L17, J15, J16, L15, and FPGA_CCLK_O_B) are used.  In your HDL, you can access all these pins directly except FPGA_CCLK_O_B, which must be accessed via the STARTUPE2 primitive (port USRCCLKO) described on about page 595 of UG953.

Cheers,
Mark

Xilinx Employee
Xilinx Employee
444 Views
Registered: ‎08-25-2010

回复: SPI pins

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Hi

Here is an AR on this:
https://www.xilinx.com/support/answers/63174.html

Thanks
Simon
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Observer bobbyl
Observer
404 Views
Registered: ‎10-24-2018

回复: SPI pins

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Thanks folks

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