How is CFI information read?
To read CFI information on Cypress Flash memory, you must put the device into CFI query mode. The device enters the CFI query mode when the system writes the CFI Query command, 98h, to address 55h, any time the device is in read mode or autoselect mode. Once in CFI query mode, you can read CFI information from the addresses (see the device data sheet). To terminate CFI query mode, the system must write the reset command.