DRAM and SPM Access Latency

Any technical questions about the Epiphany chip and Parallella HW Platform.

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DRAM and SPM Access Latency

Postby vanchiramani » Tue Mar 07, 2017 2:05 am

The memory micro benchmarks provided in the Epiphany examples measure the bandwidth of copying data from DRAM to SPM. However, I am interested is finding the latency.

I want to find the access latency for obtaining 4 bytes of data by directly reading from off-chip DRAM (VS) reading it from local SPM. Is 1 cycle for local SPM access and 100 cycles for reading directly from off-chip memory a reasonable value?

Thanks a lot in advance.
vanchiramani
 
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