Changing from XC7A35T to XC7A100T: how large should the configuration flash be?

[shall785]

Hello,

I am running out of space on a XC7A35T, which uses a N25Q128 configuration flash.  

If I change to a XC7A100T FPGA, will I need increase the configuration flash size?

Stephen

[barriet · Accepted solution]

It depends on your current Flash size... You are going from ~17Mb (rounded up) to ~31Mb for uncompressed bitstream sizes (base 10 - not base 2)

see https://www.xilinx.com/support/documentation/user_guides/ug470_7Series_Config.pdf page 14

But since flash generally comes in power of 2 sizes, I suspect you'll be fine for this particular case.

Cheers,

bt

[shall785]

According to the document posted, the minimum flash size for XC7A100T is 32Mbits, so I should be fine using the 128Mb flash I am currently using.

Thanks.