4 line Nor flash speed during memory map mode

[Zhou JianQiang]

Hi 

I use STM32H743XI and W25Q256 for my design.

And I notice W25Q256 has two speed 133Mhz(W25Q256JV) and 104Mhz(W25Q256FV), currently I use W25Q256FV, since I only use this flash with memory map mode, is it necessary to replace with W25Q256JV? Will their performance vary greatly?

W25Q256FV:

W25Q256JV:

[jiangfan · Accepted solution]

133Mhz(W25Q256JV) vs. 104Mhz(W25Q256FV), for STM32H743XI with memory map mode, performance increase for read may be 10% or less, I suppose.

[Zhou JianQiang]

Hi @jiangfan :

Thank you for your reply!