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Visitor
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Registered: ‎01-31-2019

Using QPI mode in zynq7000 for s25fl256l

Hello,

I suspect that i have accidently set the flash chip into QPI mode after which the read ID and other read/write commands fail (0x00 returned for all reads). In QPI mode the flash expects the instruction cycle to be also in 4 lines.

From the datasheet its mentioned that 0xF5 has to be send to exit this mode. But i'm unsure as to how i can modify the qspi driver to send 1 byte in 4 lines as shown below.

Its not clear from the Zynq TRM how the bus width for the transfer is selected in I/O mode.

image.png

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