SRAM Size Verification - SPC5746CSMKU6

[x-pwisniewski]

Dear NXP Support Team,
We are using the SPC5746CSMKU6 microcontroller in our automotive application and need urgent clarification regarding the SRAM size.

Physical chip marking:

SPC5746CSMKU6
1N84S
QTC2244D

Issue:
Documentation is unclear whether this part has 384KB or 512KB SRAM.
Our Test:
We performed direct memory write/read tests:

volatile uint8_t* ptr = reinterpret_cast<volatile uint8_t*>(0x40070000); // 448KB
*ptr = 0xAA;
uint8_t readback = *ptr; // Successfully read back 0xAA

Results:
0x40070000 (448KB):

Read/Write successful

Question:
Does SPC5746CSMKU6 have 512KB SRAM? Can we safely use the full  that range in production?
Thank you,

Przemyslaw Wisniewski from key solutions

[petervlna]

Hello,

Always refer to the datasheet:

3. Contact NXP representative for part number

So here is the explanation directly for your part:

So for your case  "S" version - it is 384kB of SRAM.

You can only use what you paid for, in this case 384kB of SRAM. Otherwise we do not guarantee functionality.

Best regards,

Peter