DS33Z41 Quad IMUX Ethernet Mapper
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The X86 received frame is aborted if:
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If 7d, 7E is detected. This is an abort packet sequence in X.86.
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Invalid FCS is detected.
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The received frame has less than 6 octets.
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Control, SAPI and address field are mismatched to the programmed value.
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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:
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Construct frame including start flag SAPI, Control and MAC frame
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Calculate FCS
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Perform transparency processing - 7E is translated to 7D5E, 7D is translated to 7D5D
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Append the end flag(7E)
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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.