L137 SDRAM vs L138 DDR2 comparison

Alp Nail

Other Parts Discussed in Thread: OMAPL138

Hi guys.

I had been working with c6747 for quite some time, and I am also familiar with L137. I am considering C6748 and L138 for my future work( because of upp, 2 sd card support, 475 Mhz possibility).

I need performance data access of "133 Mhz 32 bit SDRAM access in C6747" (and 16 bit version if you can) against "150 Mhz 16 bit DDR2 access in C6748", with code in L2 ram , doing multiplication and addition of 32 bit float variables residing in external memory, when two dsp's have same clock (300 Mhz). Caching of SDRAM should be closed(with MAR registers). . If you can provide code performance residing in external RAM( with no code caching), that will also be beneficial to my work.
I currently have none of the EVM's in my reach, therefore cannot produce these results.
Any application note, benchmark , experience is more than welcomed.
Thanks for the enlightenment :)

over 13 years ago

0 Mukul Bhatnagar over 13 years ago

TI__Guru* 86305 points

We don't have any benchmark data to share between the external memory performance on OMAPL137 vs OMAPL138, but you will effectively get the same throughput on 133 MHz x 32 bit SDRAM on OMAPL137 vs 133 MHz x 16 bit DDR2 (double data rate) on OMAPL138. They are also roughly at the same place in the chip topology from a latency perspective.

Hope this helps.

Regards

Mukul

0 Alp Nail over 13 years ago in reply to Mukul Bhatnagar

Prodigy 185 points

Thanks Mukul. Before accepting your answer, can you also give me some insight about mddr(lpddr) performance as an alternative option?

Thanks, regards.

Kaan

0 Mukul Bhatnagar over 13 years ago in reply to Alp Nail

TI__Guru* 86305 points

Kaan

If you are operating mDDR/LPDDR at the same frequency as you were planning to run the DDR2, you will be the same performance/throughput.

Regards

Mukul

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L137 SDRAM vs L138 DDR2 comparison