Reccommended Kintex 7 325 Flash size

[syssurge]

I´m working on a custom board based on the Kintex 7. I want to use a i2c programmable Flash for the board, but I´m unsure if 32 MB is enough, my intent is to make sure that there is space enough for the largest bitstream that could fit in the Kintex 7 325 based on the number of flip-flops etc available. the 325 has 50,950 slices, 326,080 logic cells, 407,600 flip-flops, 16,020 bytes block ram. Any help appreciated, thank you. 

[markg@prosensing.com · Accepted solution]

@syssurge 

The size of the configuration file (bitstream) for the 7K325T is shown to be about 92 Mb (not MB) by Table 1-1 in UG470(v1.13.1).  I recommend you use flash memory that can hold two configuration files in case you someday want to do multiboot (see Chap 7 of UG470).

Finally, flash with SPI (not I2C) interface is used to configure the Kintex-7 and you should select from the Xilinx approved devices shown in Appendix E of UG908(v2020.1).

Cheers, Mark

[syssurge]

192 Megabits is 23 Megabytes, so using a 32 Megabyte QSPI should be ok then, perhaps I can find one with 24Megabyte even. I see some reference boards use a 256 Megabyte QSPI, any idea why as it seems like an overkill?

[syssurge]

Nevermind my previous question, I see now that the reference oards use 256 MegaBITS and not MegaBYTES.