im using stm32l433rbt6 controller in that im working on nor flash using qspi mode i have written some dummy data and im reading that and im getting output as 0xCC when im reading rather than which i gave why im getting 0xCC?

Forum|Forum|5 years ago
December 8, 2020
7 replies
1370 views

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Tesla DeLorean

Guru

Could be a couple of things, most likely a Quad Mode setting or dummy cycles.

Did it read 0xFF when erased?

Normally when bringing up you should try the READ ID in the 1, 2 and 4-bit modes, and similarly the reads and writes

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Sjosh.2Author

Associate II

i have checked device ids for 1,4 qspi line, for 1 line im getting the correct device ids, for 4 qspi lines im getting the wrong values and for erase operation for 1 qspi lines im getting 0xFF and when i erased for 4 qspi lines im getting 0xCC instead of 0xFF.

why im getting 0xCC?

Tesla DeLorean

Guru

Sounds like your unspecified memory chip is not in Quad Mode.

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