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VLYNQ 2.X Packets
An example of a write burst flowed and interrupted by a read return data burst is shown below. In the
example, a 1 indicates a data return channel (it is actually the return data command) and a 0 indicates a
command channel, which is the command for the transaction.
IIIIclaaaadddd Iclddd III1dddd II0ddddddddddddd IIIIII0dddT IIIII1dT IIII
A command, length, address, and start receive data from the idle stream. A flow enable was received for
the command channel, but there is data to return, so the flow is followed by a channel 1 descriptor (the
command for return data actually indicates a channel 1), and the channel 1 packet is now under way. A
flow is now received for channel 1, but it is soon disabled so the channel 1 packet continues. The flow is
enabled for channel one again, quickly after flow is released for channel 0, so the data continues for
channel 0 when a flow is received again for channel 0. Channel 0 then receives a flow disable, completes
its packet, followed by channel 1 flow disable, where the channel 1 packet is also completed.
SPRUF89 – October 2007 VLYNQ Protocol Specifications 49
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