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If TYPE = 16-bit AXI stream, then appended tail is 8 bytes.
If TYPE = 32-bit AXI stream, then appended tail is 8 bytes.
If TYPE = 64-bit AXI stream, then appended tail is 8 bytes.
If TYPE = 128-bit AXI stream, then appended tail is 16 bytes.
If TYPE = 256-bit AXI stream, then appended header is 32 bytes.
If TYPE = 512-bit AXI stream, then appended header is 64 bytes.
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Larry Ruckman
ruckman@slac.stanford.edu