Xerox 560 Reference Manual

Table 16. Operational Status Byte (Register Ru 1) (cont.)
Bit
Position Significance
14 lOP Halt. This bit is set to 1 Wan error con-
dition is detected which causes the lOP to
issue a halt order to the addressed I/O de-
vice.
Error conditions which may cause
an lOP halt (independent of the HTE flag
within the I/O command doubleword) are:
1.
Bus check fault that occurs while fetch-
i ng a command
2.
Control check fault
3. Memory address error
4.
lOP memory error
5. lOP control error
Table 16. Operati onal Status Byte (Register Ru 1) (cont.)
Bit
Position
14
(cont.)
Significance
Error conditions which may cause an lOP halt
only if the HTE flag is coded with a 1 are:
1. Bus check fault that occurs while fetch-
ing data
2. Transmission memory error
3. Transmission data error
4. Incorrect length condition occurring
while the SIL flag is coded with a O.
An lOP halt condition causes the current
operation to terminate immediately as an
II unusua I end
ll
•
15 This bit is set to a 1 if a Write Lock Violation
(WL V) occurs.
Table 17. Status Response Bits for I/O Instructions
Position and State in Register Ru 1
Device Status Byte
Operational Status Byte
Significance for Significance
0 1 2
3
4
5
t
6
t
7 8 9 10 11
12 13 14
15
SIO, HIO, and no
for TDV
1
- - - -
-
- -
- -
-
- - -
-
-
interrupt pendi ng
T
-
0 0
-
-
-
- -
-
-
-
-
- -
-
-
device ready
-
0 1
-
-
- -
-
-
- - - - - -
-
device not operational
-
i 0
- -
- -
-
-
-
-
-
-
-
- -
device unavai iabie
I
-
1 1
- -
-
- -
-
- -
-
-
-
-
-
device busy
unique
to the
-
-
-
0
-
-
- - -
- - - -
- - -
device manual
device and
-
-
-
1
-
-
- -
-
-
-
-
-
- - -
device automatic
the device
-
-
-
-
1
-
- -
-
-
-
-
-
-
- -
device unusual end controller
-
-
-
-
-
0 0
-
-
-
-
-
-
- - -
device controller ready
- -
-
-
-
0
1
- -
-
- -
- -
-
-
device controller not operational
-
-
- -
-
1 0
-
- - -
- -
- -
-
device controller unavailable
-
-
-
- -
1 1
- -
-
-
- -
-
- -
device controller busy
-
- - -
-
-
- :jI~I:::
-
- -
-
-
-
-
-
reserved
-
- - -
-
-
-
-
1
-
-
- -
- -
-
incorrect length
-
- -
-
-
-
-
-
-
1
-
- - -
-
-
transmission data error
-
-
-
- - -
- - -
-
1
- -
- - -
transmission memory error
-
-
- -
- -
-
-
-
-
-
1
-
-
-
-
memory address error
same as for
SIO, HIO,
- -
-
-
-
- -
-
-
-
-
-
1
-
- -
lOP memory error
and
no
-
-
-
-
- - -
- -
-
-
-
-
1
-
-
lOP control error
I
-
-
- - - - -
-
- -
-
-
-
-
1
-
lOP halt
-
-
-
-
-
-
-
- -
-
-
-
-
-
-
1 write lock violation
tThe significance of bits 5 and 6 when response is from an RMP is as follows:
Bit 5 .
Bit 6 RMP Function
--
--
0 0 RMP ready
0 1
RMP not operational
1 0 reserved
1 1
RMP busy
Input/Output Instructions 133

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