Visible to Intel only — GUID: ljw1473709807227
Ixiasoft
4.1.2.2. IP Core Strict SFD Checking
The 50GbE core RX MAC checks all incoming packets for a correct Start byte (0xFB). If you turn on Enable strict SFD check in the 50GbE parameter editor, you enable the RX MAC to check the incoming preamble and SFD for the following values:
- SFD = 0xD5
- Preamble = 0x555555555555
The RX MAC checks one or both of these values depending on the values in bits [4:3] of the RXMAC_CONTROL register at offset 0x50A.
Enable strict SFD check | 0x50A[4]: Preamble Check | 0x50A[3]: SFD Check | Fields Checked | Behavior if Check Fails |
---|---|---|---|---|
Off | Don't Care | Don't Care | Start byte | IP core does not recognize a malformed Start byte as a Start byte |
On | 0 | 0 | Start byte | |
0 | 1 | Start byte and SFD | IP Core drops the packet | |
1 | 0 | Start byte and preamble | ||
1 | 1 | Start byte and preamble and SFD |
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