S32KのトピックRe: 【SRAM Random value for S32K146】

【SRAM Random value for S32K146】

ZJ123321 — Thu, 21 Mar 2024 09:03:30 GMT

Hello:

There was a no initialized variable (address in 0x2000EFA8, SRAM) in our project.

For a same chip, we found that no matter how much times we power on and power off, this variable has value either equal to 0x55 or equal to 0x57.

We have tested several chips, the value may be random between different chips, but for the same chip, the values were almost the same after power off->power on (may be only one bit different.)

We want to know why the SRAM has such behavior, could please tell us the principle of this, thank you very much!

Re: 【SRAM Random value for S32K146】

davidtosenovjan — Thu, 21 Mar 2024 13:30:24 GMT

After POR, there can be any content in RAM before ECC is initialized.

Random data is not necessarily "random", there may well be some patterns.

Re: 【SRAM Random value for S32K146】

ZJ123321 — Tue, 02 Apr 2024 06:45:01 GMT

Got it ! Thank U very much!