Maxim Integrated DS33Z41 - Manual (Page 57)

DS33Z41 Quad IMUX Ethernet Mapper
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The X86 received frame is aborted if:
• If 7d, 7E is detected. This is an abort packet sequence in X.86.
• Invalid FCS is detected.
• The received frame has less than 6 octets.
• Control, SAPI and address field are mismatched to the programmed value.
• Octet 7d and octet other than 5d, 5e, 7e, or dd is detected.
For the transmitter if X.86 is enabled the sequence of processing is as follows:
• Construct frame including start flag SAPI, Control and MAC frame
• Calculate FCS
• Perform transparency processing - 7E is translated to 7D5E, 7D is translated to 7D5D
• Append the end flag(7E)
• Scramble the sequence X 43 +1
Note that the Serial transmit and receive registers apply to the X.86 implementations with specific exceptions. The
exceptions are outlined in the Serial Interface transmit and receive register sections.