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Relationship between SDRAM spec and system performance

CalvinTai
Intellectual 850 points
Other Parts Discussed in Thread: OMAP-L137

Dear all:

   I use OMAP-L137. As the SDRAM can be optioned as 16 bits or 32 bits (half/full bandwidth) and the speed (ex. PC-100, PC-133) and refresh rate are another options can be set. How can I get a rough performance v.s. above parameters so I can choose a proper SDRAM type for project?

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    TI__Mastermind 27585 points

    The simple calculation is (bus_size/8)*CLK. In this case, you will get about 200MB/s for a 16-bit PC-100 memory, and 532MB/s for a 32-bit PC-133 memory.

    In terms of real world performance, the EMIFB interface can reach from 85-95% of the theoretical throughput, while EMIFA will be significantly less.

    The refresh rate is slow enough not to be a factor in throughput.

    Jeff