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The IDLE code is sent when no data frame and no trigger code is being sent.  Trigger codes can be sent at any time, independent of the state of the data transport.  There are 8 trigger codes that are mapped to a 8-bit trigger operation code bus.  The GR is used to send a "global reset" to all the ASIC digital logic.  The SOF code is used to indicate the start of a data payload transport. After the SOF either the data payload (or trigger code) is sent.  After the last data payload byte, the EOF code is sent. 

IDLEK28.5 (Comma)
SOF (Start of Frame) K28.0
EOF (End of Frame)K28K30.17
Trigger Code[BIT=0]K28.2
Trigger Code[BIT=1]K28.3
Trigger Code[BIT=2]K28.4
Trigger Code[BIT=3]K28.6
Trigger Code[BIT=4]K28.7 (Comma)
Trigger Code[BIT=5]K23.7
Trigger Code[BIT=6]K27.7
Trigger Code[BIT=7]K29.7
GR (Global Reset)K30.7K28.1 (Comma)

Data Frame Format for Register Access

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