Maximum 4bit port bandwidth

Technical discussions around xCORE processors (e.g. General Purpose (L/G), xCORE-USB, xCORE-Analog, xCORE-XA).
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Folknology
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Maximum 4bit port bandwidth

Postby Folknology » Wed Apr 28, 2010 11:00 am

What is the maximum rate I can clock in or out of a 4 bit port in regular 4 bit mode (not Links) on an L1-64?
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Woody
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Postby Woody » Wed Apr 28, 2010 11:57 am

If you run the port off of the 100MHz reference clock and put the port into buffered mode, then you can clock it at 100MHz. You need to use buffered mode because you won't be able to input/output the data at that rate unless you concatenate 4 bit samples into a 32 bit word and shift in/out 8x4bit values every 80ns.
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Folknology
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Postby Folknology » Wed Apr 28, 2010 2:22 pm

Cool, up to approx 50MB/sec.
Thanks Woody

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