Honeywell MTU9104 Operation Manual page 19

TABLE 2·2 (CONT). STATUS BIT DEFINITIONS -WORD 1
Status Condition
Bit
Nonexistent Resource 13
Error
Bus Parity Error 14
Noncorrectable Memory 15
Error
aRead After Write
Definition
fudicates the MTC attempted a Write or Read request
bus cycle and received a NAK response. Occurrence
oithis condition does not cause a termination of the
operation in progress;. however, it can result in bad
data being written on the tape.
Indicates the MTC detected a parity error on either
byte if the Data Bus during any output bus cycle
(i.e., odd function code), during a second-half memory
read cycle or when a parity error is detected in bits 0-7
of the Address Bus during an Output Address
command. Occurrence of this condition does not
cause a termination of the operation in process;
however, it can result in bad data being written on
tape.
Indicates that during execution of the previous
operation, the main memory detected a memory
read error which the EDAC algorithm could not
correct. The data that was delivered to the MTC was
incorrect. Occurrence of this condition does not cause
a termination of the operation in progress; however,
it can result in bad data being written on tape.
Reset by
Initialize, Input Status
Word 1, or Output Task. Word
command
hritialize, or (error
free)
Input
Status Word 1 command
Initialize or Output Task
Word command
Command Input Status Word 2
Function
Function Code lA
Format
Address Bus
0
7 8 1718
23
Not Used
I
Channel Number
10 I I 0 I 0
I
(Device)
f
Request Cycle 0
Data Bus
Causes the referenced channel's Status Word 2 to
be transferred to the requesting channel. During
the Response cycle (Second Half Read), the MTC
will return in bits 8-23 of the Address Bus the same
data received in bits 0-15 of the Data Bus during the
Request cycle. Bits 0-7 of the Address Bus and the
parity bit associated with these bits are the same
data received during the Request cycle. See Table
2-3.
9 10 15
I
Channel Number
I I
(CP)
Address Bus
2 B
121B
.:l
Not Used
I
Channel Number
I I
(CP)
Response
Cycle
t
Data Bus
o
I 2 3 4 5 6 7 8 9 101112131415
OnUne _ _ _
...J
Rewinding - - -....
File in Protect _ _
---J
High-Density Selected
Data Service Rate Error - - - '
Uncorrectable Character Error
Single Channel (PE)/ CRC (NRZI) Error
·Multiple Channel (PE)/ LRC (NRZI) Error
Status Condition
Online
Rewinding
File in Protect
PROGRAMMING
EOB Late
EOBEarly
BOB Late
BOB Early
L - - Functionality Not Available
' - - - - Time Out Check
~---
RFU - MBZ
' - - - - - - RFU - MBZ
TABLE 2·3. STATUS BIT DEFINITIONS- WORD 2
Bit Definition
o
1
2
Indicates the unit is online
to the subsystem via the
ONLINE switch on the unit. The unit can also be
put into offline status via the Rewind and Unload
instruction.
Indicates the unit is processing a rewind operation
either via a command issued by the subsystem or
the REWIND switch on the unit.
Indicates the unit is in write protect (i.e., the write
permit ring is not in position on the mounted file
reel).
2-12
Reset by
CFI0