Pipelined read in Avalon Interface

If you're doing pipelined transfers, it's recommended to have waitrequest control from the slave (responder). It's required if you do pipelined transfers with variable latency. It's not necessarily required if you use fixed latency.

See the spec for details:

https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/manual/mnl_avalon_spec.pdf

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