SDRAM vs. DDRAM Performance

Some info can be found in followong graph : testresults (http://users.pandora.be/svhb/test%20results%20jpeg%20algorithm.pdf)

Some explanations about the graph :

CPU 85 PM DDR MTXA130 DM DDR MTXA130 means :

CPU 85 : cpu speed 85Mc,

PM DDR MTX 130 = program memory DDR Microtronix core 130Mc

DM DDR MTXA130 = data memory (stack, ...) DDR Microtronix core 130Mc

All CPUs on 52Mc are NIOSII in a cyclone device

All others are NIOSII in CycloneII

The CPU is generated as standard (s-version), with smalles possible instruction cache, no data cache (we want to test memory access here!).

The algorithme is a JPEG encoder, the different steps in the encoding are measured also. No Hardware optimisations!

Synchronuous SRAM seems to be best, but more expensive.

Hope this helps.

Stefaan