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L - Last (EOM)
This bit is valid only in GCI mode when the IMP implements the monitor
channel protocol. This bit is set when the end-of-message (EOM) indication
is received on the E bit.
NOTE
When this bit is set, the data byte is not valid.
ER - Error Condition
This bit is valid only in GCI mode when the IMP implements the monitor
channel protocol and the L bit is set. This bit is set when an error condition
occurs on the monitor channel protocol. A new byte is transmitted before
the IMP acknowledges the previous byte.
MS - Data Mismatch
This bit is valid only in GCI mode when the IMP implements the monitor
channel protocol. This bit is set when two different consecutive bytes are
received and is cleared when the last two consecutive bytes match. The
IMP waits forthe reception of two identical consecutive bytes before writing
new data to the receive BD.
Bits 11-10- Reserved for future use.
AB - Received A Bit
This bit is valid only in GCI mode when the the monitor channel is in
transparent mode.
EB - Received E Bit
This bit is valid only in GCI mode when the the monitor channel is in
transparent mode.
Data - Data Field
The data field contains the byte of data received by SMC1.
MOTOROLA
MC68302 USER'S MANUAL
4-117
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