184.108.40.206. Avalon-ST Source Interface
When the packet size is greater than one (multichannel), the source interface expects your application to supply the count of data starting from 1 to the packet size. When the source interface receives the valid flag together with the data_count = 1, it starts sending out data by driving both the ast_source_sop and ast_source_valid signals high. When data_count equals the packet size, the ast_source_eop signal is driven high together with the ast_source_valid signal.
If the downstream components are not ready to accept any data, the source interface drives the source_stall signal high to tell the design to stall.
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