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Thank you for contacting Cypress Semiconductor.
- The difference between Quad mode and QPI mode is that the instructions in QPI mode is also transferred on four IO lines, however the instructions in Quad mode are sent on a single line.
- When QPI mode is enabled by setting the QA_NV bit (CR2NV) bit the QUAD_NV bit (CR1NV) automatically gets set. However, when the QA_NV bit is reset it does not have any effect on the QUAD_NV bit.
- Similarly, when the QA (CR2V) bit is set to QPI Mode, the QUAD bit (CR1V) is also set to Quad Mode (CR1V=1). When this bit is cleared to legacy SPI Mode, the QUAD bit is not affected.
- I would like to inform you that Single SPI commands still continue to work in Quad mode but not in QPI mode. In QPI mode, all instructions, address and data are sent and received on four IO lines.
Please let me know if you have any more questions.
I'm clear now. thanks.