Is it possible to change the FlexSPI chip select interval during runtime by writing to the register or would we need to follow a special setup routine for it to avoid issues?

[imxrtuser]

Hello,

is it possible to change the FlexSPI chip select interval during runtime by writing to the register or would we need to follow a special setup routine for it to avoid issues?

The flash we are planning to use defines two different values depending on the commands executed.

For read to read 15 ns and for write/program/erase to read status 50 ns therefore we would like to set the CSINTERVAL to 50 ns after a write/program/erase and back to 15 ns after the first status register read.

I would change the value with

FLEXSPI->FLSHCR1[port] = (FLEXSPI->FLSHCR1[port] & ~FLEXSPI_FLSHCR1_CSINTERVAL_MASK) | FLEXSPI_FLSHCR1_CSINTERVAL(CSInterval);‍

Kind regards,

Stefan

[FelipeGarcia · Accepted solution]

Hello Stefan,

I would recommend to use the same method used in our FlexSPI examples with FLEXSPI_SetFlashConfig function. Maybe you could try the following.

    /* Configure flash settings according to serial flash feature. */
    FLEXSPI_SetFlashConfig(base, &deviceconfig, kFLEXSPI_PortA1);
 
    /* Do software reset. */
    FLEXSPI_SoftwareReset(base);‍‍‍‍‍‍‍‍‍‍

I hope it helps!

Best regards,

Felipe

[imxrtuser]

Hello Felipe,

thank you for your answer. This function will set a lot more than necessary and produce (time-)overhead because it reconfigures the DLL and has 100 NOPs for DLL locking. We will use 50ns for for now.

Kind regards,

Stefan