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FLAG REG
6
COA
cc
SILi
SKIP
PCI
FIN
TOTAL
MP
ENABLE
FIRST
REC
STOP
STAT
SUP
REQ
STAT
6
BYTE
FETCH
REL
NEXT
Cl
C2
C3
C4
OUT
IN
IN
Bit
Indicator
ALO
Position
Description
11
GC101
GC101
GENERAL
GC101
PURPOSE
GC101
1-7
The generol purpose register is used os a buffer far pre-fetched and control information and far byte
REG
GC121
control on input dota,
GC121
GC121
8-10
Not used.
r
GCl61
FLAG
cc
GCl61
REG
SILi
GC161
11-15
The flog register indicotes when the associated flag bit in the CSW is active.
SKIP
GC161
:_fQ
GCW.
FINISH
GB161
16
Finish indicates the end of each routine.
FIRST WORD
GF161
17
First word remains on unti I the first word in the record is stored ar fetched.
18
Not uoed.
FIRST BYTE
GFl61
19
First
~e
remoins on until the first byte is received on the interface.
TOTAL REC FETCH
GFlll
20
Total record fetch indicates that a
LLW
and its data have been completely pre-fetched on a write
data chain
~ation.
WR CHAIN PRCD
GT131
21
Write chain proceed indicates when the data under control
of~
previous CCW has been completely
transmitted.
STOP REL
GV111
22
Sto_e._releose dr"l'"_ select out and ends an interface s!quence.
23-25
~
uoed.
STAT NEXT
GT161
26
The status next latch represents special program check conditions that should block the setting of
incorrect length.
~
:!:§
uoed.
r l
GA141
C2
GA141
The multipurpose lotches (Cl, C2, C3, C4) indicate specific conditions during execution of an
1/0
MP
C3
GA151
28-31
C4
GA151
routine.
SUP OUT
GS131
32
Suppress out indicates the
s~ess
out line is up on the interface.
REQ IN
~14_!
33
Indicates r!9_uest in is
~on~ inte~ace.
SVC OUT HOLD
GVl51
34
Service outliOid indicates the channel is holding service out up until ithos the first word ready to
send over the interface.
ENABLE STAT IN
GSlll
35
Enable status in indicates the channel
may
receive status in.
FIGURE 150. SELECTOR CHAi'-lNEL ROLLER - POSITION 6
Bit
Indicator
ALO
Po.it ion
Description
0-13
Not used.
FILE
XE501
14
Set from CAW bit 7 far 1410 file t.;_zfrom EBCDIC-II code translation duriflli..!ZO data transfers.
J.OA~MOJLE
X~l
15
Set fram CAW bit 6 far 1410
!LO
'!J:!!!Otions that involve chan...a!!!a. the wordmark bit.
ODD PARITY
XE501
16
Set from CAW bit 4 for 1410 JZO ~rations with an oddpari!r_ ta~ code.
TRANSLATE
XE521
17
Set from CCW bit 38 to activate the selector cliennel translator control circuits during
1/0
data
transfers in 1410 mode.
18-35
Not used.
FIGURE 151. SELECTOR CHANNEL ROLLER - POSITION
7
170
(3/71)
Model 50 FEMM
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