IBM 1 Series - Page 58

jsuueysy)
O/I
JOSSIDOI
dg
Ly-c
° +Cycle-steal status bus bit 0
et Ciclessteal status bus bit 1
Inverter
AND
IPL tag latch
Primary Inverter AND
Device
/
inverter
OR
|
Set
. ; /
configuration ,
jumpers /
/ Flip
pe latch
\
= \
\ OR.
\
Reset
Alternate Inverter AND
inverter
+ Initiate IPL
AND
inverter
Enable IPL
+ System reset Data
@——Inverter Clock
- Power on reset D-trigger
- IPL complete
°
ad
OR
|
Reset
Key:
(1) = device interface with channel ~ Abort
G) = jumper connection AND IPL
inverter
IN. = negative active signal
4 = positive shift required
Figure 2-19. Processor-initiated IPL logic
-IPL
}—————-@
+Enable IPL
cycle-steal
request and
transfers