Abouth Flexspi Pin Configuration

[omerkaanbasakin]

Hello we are using IMXRT-1052 on custom board. Also we are using MCUXpresso IDE and PE Micro UniversalMutilink  for debugging. On the custom board we used IS25LP064A as  external flash. We want connect flash  to mcu from the following pins:

GPIO_SD_B1_06 -> FlexSPI_SSO  -> FLEXSPI_A_SSO_B

GPIO_SD_B1_07 -> FlexSPI_CLK -> FLEXSPI_A_SCLK

GPIO_SD_B1_08 -> FlexSPI_DO  -> FLEXSPI_A_DATA0

GPIO_SD_B1_09 -> FlexSPI_D1 ->  FLEXSPI_A_DATA1

GPIO_AD_B1_11 -> FlexSPI_D2 -> FLEXSPI_A_DATA2

GPIO_AD_B1_10 -> FlexSPI_D3 -> FLEXSPI_A_DATA3

1) What is the meaning of the naming FLEXSPI_A_SSO_B ?  It is obvious that this pin is used for FlexSPI_A but what is the meaning of "_B"? Another feature?  

2) Can non-sequential FexSPI pins be used  ( D2 and D3  are sequential  but separate from other pins)? If it can, will it effect the flash boot process or flash speed? 

Kind Regards.

[Yuri · Accepted solution]

@omerkaanbasakin 
Hello,

Use Table 74 (Boot through FlexSPI) of the Datasheet
for selecting pins, used for boot. (Looks like FLEXSPI_A_DATA2 and
FLEXSPI_A_DATA3 are mixed up in Your configuration)

https://www.nxp.com/docs/en/data-sheet/IMXRT1050CEC.pdf

"_B" suffix means active LOW signal.

Regards,
Yuri.

[omerkaanbasakin]

Hi @Yuri,

Thanks for your detailed and understandable reply.

We missed the Table 74. We will not able to  use d2 and d3 pinsto boot on the pins ı have already specified.

Kind Regards,

Kaan.