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SENSE BYTE
UCW
Auxiliary
Storage
Address
I
I
I
8
9
A
B
c
D
E
F
OXF7J
r----~~...-~~--~~----..--~~-~~--~,---~~~~~~--r~~-~~~~~~---t
Sense
Byte
. 1-lntervention Required
2-(Not Applicable)
3-Equipment Check
i=}(Not Applicable)
7-
*At Interrupt Time
Channel
Status
Flags &
Op
Data Address
-u~-i---
Status*
I
Count Field
Next CCW Address
0-Chain Data (CD) Flag
1-Chain Command (CC) Flag
2-Suppress Length Indication (SU) Flag
3-Skip Flag
4-Program Controlled Interruption (PCll Flag
5-Active Bit
6-0p 0
i
7 _
0
P 1 ~Note 1
0-Secondary Bit
1- Incorrect Length
2-Program Check
3-Protection Check
4-0 Count Bit
5-Channel Control Check
6-lnterface Check
7-PR-KB Interrupt in
1.8.
FF~i:;
Appl i c abl e )
3-Busy
4-Channel End
5-Device-E nd
6-Unit-Check
7-Unit Exception
Note 1: With Active Bit=1 Op-0 and Op-1
Decode as Follows;
01 -Write
10 - Read or Sense
11 - Write with ACR
Figure 1-38. PR-KB Sense Byte and Unit central Word -- ucw Format
1-34 (7/69)
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