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The serial data word is 17 bits wide - 16 data bits and a status/control bit.
16
15
a
I
SIC
I
DATA FIELD
11'
STATUS CONTROL BIT
Bit 16 indicates status of CPU-generated messages as shown in Table 7-3.
Bit 16
0
0
1
1
1
Table 7-3. CPU Generated
Message Encoding
Data
Message Type
xxxx
Valid Data Transfer
FFFF
Command Complete; Status OK
0000
Not Ready with Response; Come Again
0001
BERR Terminated Bus Cycle; Data Invalid
FFFF
Illegal Command
Command and data transfers initiated by the development system should clear
bit 16. The current implementation ignores this bit; however, Motorola reserves
the right to use this bit for future enhancements.
CPU32 REFERENCE MANUAL
DEVELOPMENT SUPPORT
MOTOROLA
7-9
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