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Observer shall785
Observer
164 Views
Registered: ‎09-18-2018

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

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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

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Xilinx Employee
Xilinx Employee
147 Views
Registered: ‎08-13-2007

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

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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

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2 Replies
Xilinx Employee
Xilinx Employee
148 Views
Registered: ‎08-13-2007

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

Jump to 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

View solution in original post

Observer shall785
Observer
136 Views
Registered: ‎09-18-2018

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

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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.

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