
10
Data Device Corporation
www.ddc-web.com
BU-65528 and BU-65527
F1 web-10/02-0
TABLE 29. BC MODE BLOCK STATUS WORD
11
BIT
DESCRIPTION
15(MSB) EOM
14
SOM
13
CHANNEL B/A
12
ERROR FLAG
10
FORMAT ERROR
9
NO RESPONSE TIMEOUT
8
LOOP TEST FAIL
7
MASKED STATUS SET
6
RETRY COUNT 1
5
RETRY COUNT 0
4
GOOD DATA BLOCK TRANSFER
3
WRONG STATUS ADDRESS/NO GAP
STATUS SET
2
WORD COUNT ERROR
1
INCORRECT SYNC TYPE
0(LSB)
INVALID WORD
TABLE 28. RT BIT WORD REGISTER (READ 2EH)
11
BIT
DESCRIPTION
15(MSB) TRANSMITTER TIMEOUT
14
LOOP TEST FAILURE B
13
LOOP TEST FAILURE A
12
HANDSHAKE FAILURE
10
TRANSMITTER SHUTDOWN A
9
TERMINAL FLAG INHIBITED
8
CHANNEL B/A
7
HIGH WORD COUNT
6
LOW WORD COUNT
5
INCORRECT SYNC RECEIVED
4
PARITY/MANCHESTER ERROR RECEIVED
3
RT-RT GAP/SYNCH/ADDRESS ERROR
TRANSMITTER SHUTDOWN B
2
RT-RT NO RESPONSE ERROR
1
RT-RT 2ND COMMAND WORD ERROR
0(LSB)
COMMAND WORD CONTENTS ERROR
Note: TABLES 29 to 32 are not registers. They are WORDS stored in
RAM.
TABLE 27. RT STATUS WORD REGISTER (READ/WRITE 2CH)
11
BIT
DESCRIPTION
15(MSB) LOGIC “0”
10
MESSAGE ERROR
9
INSTRUMENTATION
8
SERVICE REQUEST
7
RESERVED
6
RESERVED
5
RESERVED
4
BROADCAST COMMAND RECEIVED
3
BUSY
LOGIC “0”
2
SUBSYSTEM FLAG
1
DYNAMIC BUS CONTROL ACCEPT
0(LSB)
TERMINAL FLAG
TABLE 26. BC FRAME TIME/RT LAST COMMAND/MT TRIGGER
REGISTER (READ/WRITE 2AH)
BIT
DESCRIPTION
15(MSB) BIT 15
0(LSB)
BIT 0
TABLE 25. BC MESSAGE TIME REMAINING REGISTER
(READ/WRITE 28H)
BIT
DESCRIPTION
15(MSB) BC MESSAGE TIME REMAINING 15
0(LSB)
BC MESSAGE TIME REMAINING 0
Note: resolution = 1
s per LSB
Note: resolution = 1
s per LSB
TABLE 24. BC FRAME TIME REMAINING REGISTER
(READ/WRITE 26H)
BIT
DESCRIPTION
15(MSB) BC FRAME TIME REMAINING 15
0(LSB)
BC FRAME TIME REMAINING 0
TABLE 23. MONITOR DATA STACK ADDRESS REGISTER
(READ/WRITE 24H)
BIT
DESCRIPTION
15(MSB) MONITOR DATA STACK ADDRESS 15
0(LSB)
MONITOR DATA STACK ADDRESS 0
TABLE 22. CONFIGURATION REGISTER #5 (READ/WRITE 22H)
11
BIT
DESCRIPTION
15(MSB) LOGIC “0”
14
LOGIC “0”
13
LOGIC “0”
12
LOGIC “0”
10
RESPONSE TIMEOUT SELECT 1
9
RESPONSE TIMEOUT SELECT 0
8
GAP CHECK ENABLED
7
BROADCAST DISABLED
6
LOGIC “1” FOR 65528, LOGIC “0” FOR 65527
5
RT ADDRESS 4
4
RT ADDRESS 3
3
RT ADDRESS 2
EXPANDED CROSSING ENABLED
2
RT ADDRESS 1
1
RT ADDRESS 0
0(LSB)
RT ADDRESS PARITY