NXP DesignsのトピックRe: MPC5777C Flash timing analysis

MPC5777C Flash timing analysis

manaswini1317 — Thu, 01 Oct 2020 02:32:22 GMT

Hi,

I have written1MB of data to internal flash (C55FMC). My requirement is, while writing, an LED on the board should be SOLID ON. I went through the electrical characteristics of programming to internal flash and the data says, it takes 4000ms to program 256KB of data. Ideally, 1MB should take 16 seconds.

But in my case, I see that 1MB of data is flashed not in less than 4-5 seconds (LED is solid ON for 4-5 seconds). My theoretical and practical timing values are not close. Is this huge difference/behavior expected?

Please help me understand.

Re: MPC5777C Flash timing analysis

lukaszadrapa — Thu, 01 Oct 2020 14:41:17 GMT

Hi,

4000ms is "Lifetime Max" parameter. It is real and guaranteed maximum.

For normal operation, you should consider rather these values:

And as mentioned in the footnotes, the spec does not include SW overhead and quad-page programming is expected. So, 4-5s sounds as a reasonable time.

Regards,

Lukas

Re: MPC5777C Flash timing analysis

manaswini1317 — Fri, 02 Oct 2020 01:55:54 GMT

Thanks Lukas. This helps