MPC5xxx中的主题 Flash optimization in MPC5777C

Flash optimization in MPC5777C

sourabhjain — Thu, 03 Jan 2019 08:38:39 GMT

Hi,

I am using MPC5777C with system clock 192MHz and platform clock for flash is 96MHz. I want to configure the flash optimization to make MPC5777C run faster. Can you suggest me in details how to do it?

thanks and Regards,

Sourabh

Re: Flash optimization in MPC5777C

davidtosenovjan — Thu, 03 Jan 2019 09:14:51 GMT

Hi, pay attention to chapter 4.1 in AN5191 describing process of flash optimization. RWSC and APC value for flatp=96MHz you may find in device's datasheet, section 3.12.6.

https://www.nxp.com/docs/en/application-note/AN5191.pdf

https://www.nxp.com/docs/en/data-sheet/MPC5777C.pdf

Re: Flash optimization in MPC5777C

sourabhjain — Fri, 04 Jan 2019 05:15:02 GMT

Can you please tell me what is Flash memory read latency on mini-cache hit or miss value signify?

i am using MPC5777C with platform clock 96MHz so for this Flash memory read latency on mini-cache hit or miss value is 5 and 1. so does this meaning and how to calculate read latency in terms of time?

Re: Flash optimization in MPC5777C

davidtosenovjan — Fri, 04 Jan 2019 09:22:21 GMT

Flash controller on this device contain mini-cache memory (instead of simple preftech buffer) where every cache line (i.e. set) consists of 32 bytes.

If read data are already pre-fetched (for instance they are accessed second time) then access time is 1 platform clock, it is cache hit.
If read data are not pre-fetched (for instance accessed first time) then access time 5 platfrom clocks, it is cache miss.

Re: Flash optimization in MPC5777C

sourabhjain — Wed, 09 Jan 2019 11:29:19 GMT

Hi David,

How to measure the performance after doing flash optimization? Is there any particular code for this where i can check the performance of code?

Re: Flash optimization in MPC5777C

sourabhjain — Fri, 11 Jan 2019 08:46:06 GMT

Hi,

Do you have any flash optimization code?