A simple question about the streaming interface. I can see examples of the relationship between 'Valid' and 'Ready' and successfully implemented some stuff, but only mid-packet.
What is the relationship between 'Start Of Packet' and 'Ready'?
If 'Ready' is low and a new packet presents on the interface, 'Valid' will signal high.
What does 'SOP' do?
Does it go high for one clock cycle or does it stay high until 'Ready' goes high?
I cannot seem to find a definition for this in the streaming spec.
startofpacket is always single-cycle. You would not assert it and mark it as valid if ready from the sink is not already asserted, and it's not held while waiting for ready to go high like when a host sees the waitrequest signal in a memory-mapped interface.
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