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The FPGA sends request messages to the ASIC in the serial protocol data payload tranport (in-between SOF and EOF). The ASIC processes the message and responds back to the FPGA. Only 1 message is in flight at any time to remove the requirement of back pressuring the link. Both the request message and responds message are the same size (13 bytes).
ASIC Inbound (FPGA Outbound) Request Format
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Overview
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