Maxim Integrated DS33Z41 User Manual

Page 57

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DS33Z41 Quad IMUX Ethernet Mapper

57 of 167

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

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.