topic Re: SRAM CS definition in i.MXRT1170 in i.MX RT Crossover MCUs

SRAM CS definition in i.MXRT1170

Eugene3 — Wed, 25 Oct 2023 06:18:35 GMT

There are some wordings about SRAM chip select in the i.MXRT1170 reference manual.

"SRAM CE# X" is used on IOCR section.

"SRAM CS X" is used on BRn section.

"SRAM device X" is used on SRAMCRn section.

Are "SRAM CE# 0", "SRAM CS 0" and "SRAM device 0" same meaning?

Re: SRAM CS definition in i.MXRT1170

Omar_Anguiano — Wed, 01 Nov 2023 00:33:42 GMT

SRAM CE# is used as there are some pins that can optionally be configurable as Chip Enable.
In BRn CS is referred to as SRAM devices that can be connected to SEMC, as you know you can connect up to 4 devices with 4 different CS.
SRAM CSn can be used to refer to a specific device e.g. CS0 is used in SRAM device 0; while CE# refers specifically to the ChipEnable signal.

Best regards,
Omar

Re: SRAM CS definition in i.MXRT1170

Eugene3 — Wed, 01 Nov 2023 00:50:47 GMT

Hi @Omar_Anguiano

Thank you for your kindly answer.

CSn is used in SRAM device n, and its ChipEnable signal is CE# n.

n = 0 to 3.

Is my understanding correct?

Re: SRAM CS definition in i.MXRT1170

Omar_Anguiano — Wed, 01 Nov 2023 20:03:12 GMT

Your understanding is correct.
It is important to clarify that CE and CS make reference to the same signal.

Best regards,
Omar

Re: SRAM CS definition in i.MXRT1170

Eugene3 — Wed, 01 Nov 2023 23:41:09 GMT

Hi @Omar_Anguiano

Thank you. I completely understand.