Benchmark for external memory access timing on C6748 LCDK

Jing Song

Hi,

I'm developing a custom boot loader on C6748 LCDK. For now, I want to collect the timing data of my boot loader, especially for coping the application from external memory (nand flash) into L2-RAM. What is the best and accurate way to do it?

BTW, I'm using CCS v5 with a XDS510 emulator.

thanks,

Jane

over 11 years ago

0 Titusrathinaraj Stalin over 11 years ago

TI__Guru** 116100 points

Hi Jane,

It depends on size of the executable (bootloader) which is resides on flash, And also type of emulator has been used.

0 Jing Song over 11 years ago in reply to Titusrathinaraj Stalin

Prodigy 200 points

Hi Titusrathinaraj,

We use HPI boot mode to copy the secondary bootloader into L2-RAM. Then the secondary bootloader will initialize PLL and EMIF and load application from falsh into L2-RAM. I think I can use timer to collect the timing data, it's precise enough, right?

Thanks,

Jane

0 RandyP over 11 years ago in reply to Jing Song

TI__Guru* 84110 points

Jane,

The timer will work fine. You will need to note the clock divider ratio and then multiply the timer count by that divider and then by the DSP clock period.

It might be easier to use an oscilloscope to watch the time spent with the NAND accesses occurring. That may be helpful for figuring out how efficient your NAND reads are, in case you want to try to make it faster.

Regards,
RandyP

Processors

Processors forum

Benchmark for external memory access timing on C6748 LCDK