On Sun, Sep 27, 2020 at 8:23 PM Clay Daniels firstname.lastname@example.org wrote:
Looking for schematic for: MSI X570-A PRO (MS-7C37)
Ivan Ivanov pointed out a very nice detailed view which I could not find in MSI marketing propaganda, and it looks like I will need to use a CH341A external programmer. This means I need to know if the vcc to the chip is 3.3v or 5v. I have no real clues without a schematic. Are these available?
VCC for SPI flash chips is never 5V. It's usually either 3.3V or 1.8V, and the best way to know is to look at the chip itself. It's a WSON8 package located between the first PCIe x16 slot and the CPU heatsink mount bracket, next to a connector labelled JSPI1. This connector is NOT meant for in-system programming, but for plugging in another flash chip and disabling the onboard one.
I think the chip in the picture is a Winbond. `W25Q*V*` chips run on 3.3V, whereas `W25Q*W*` chips are 1.8V parts. Note the `V` vs `W` difference.
See nice Russian NIX picture at: https://www.nix.ru/autocatalog/motherboards_msi/MSI-X570-A-PRO-RTL-AM4-X570-...
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