BIOS Chip question

[jayjayuk]

Just had a quick question about bios chip numbering please.

for example..

WINBOND W25Q256FVEQ

Anyone know what the last 2 characters represent?

Reason I ask is that i've been looking for a replacement bios chip and wondered if i needed the exact matching last 2 characters,

or could I say use a W25Q256FVEG instead?

Thanks

[Per Hansson]

Re: BIOS Chip question

Hunt for datasheets, it will be in them.
But I did not find one with a quick search ending in "EQ" at all, so are you sure about that?

https://www.digikey.se/products/sv?keywords=W25Q256FVE
https://cdn.badcaps-static.com/pdfs/...88fc4ccac8.pdf

[jayjayuk]

Re: BIOS Chip question

Hunt for datasheets, it will be in them.
But I did not find one with a quick search ending in "EQ" at all, so are you sure about that?

https://www.digikey.se/products/sv?keywords=W25Q256FVE
https://cdn.badcaps-static.com/pdfs/...88fc4ccac8.pdf

Thanks yeah i did look at datasheets, but I couldn't find much of an answer.

https://cdn.badcaps-static.com/pdfs/...88fc4ccac8.pdf

Both W25Q256FVEIQ (25Q256FVEQ) and W25Q256FVEIG (25Q256FVEG) are in there under the same area Package type E, so i assume they're interchangeable??

[Per Hansson]

Re: BIOS Chip question

I would not just blindly count on it, see for example this:

7.1.9 Quad Enable (QE) – Volatile/Non-Volatile Writable
The Quad Enable (QE) bit is a non-volatile read/write bit in the status register (S9) that enables Quad SPI
operation. When the QE bit is set to a 0 state (factory default for part number with ordering options “IG”
and “IF”), the /WP pin and /HOLD are enabled, the device operates in Standard/Dual SPI modes. When
the QE bit is set to a 1(factory default for Quad Enabled part numbers with ordering option “IQ”), the Quad
IO2 and IO3 pins are enabled, and /WP and /HOLD functions are disabled, the device operates in
Standard/Dual/Quad SPI modes.

[jayjayuk]

Re: BIOS Chip question

I would not just blindly count on it, see for example this:

7.1.9 Quad Enable (QE) – Volatile/Non-Volatile Writable
The Quad Enable (QE) bit is a non-volatile read/write bit in the status register (S9) that enables Quad SPI
operation. When the QE bit is set to a 0 state (factory default for part number with ordering options “IG”
and “IF”), the /WP pin and /HOLD are enabled, the device operates in Standard/Dual SPI modes. When
the QE bit is set to a 1(factory default for Quad Enabled part numbers with ordering option “IQ”), the Quad
IO2 and IO3 pins are enabled, and /WP and /HOLD functions are disabled, the device operates in
Standard/Dual/Quad SPI modes.

OK, Thanks

It doesn't seem clear though that the last 2 characters indicate this feature, you would assume if it were the EQ meant Enabled quad or something, however when i google search the other one ending EG it states on websites it's also a Quad enabled SPI.

Why is this not clearer?

[piernov]

Re: BIOS Chip question

.

[jayjayuk]

Re: BIOS Chip question

.

Nice find, thanks for your help. Much appreciated