Logic Diagram; Selector Channel And Device Controller Simplified - HP 3000 III Series Manual

I/O System
TO lOP BUS
,-- AI- ---..
151
SO 10CNID
ll7DEVNOI I,..T DEVNO
INT INT
INT INT
I
"~
REO ACK POLL POll
IN OUT
I
51 LOGIC
DC~V:pO
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DEVNO
JMPRS/8
I
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L±J
DECODER
I
v---
II
I ACTIVE
MASK
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FF
I
PIN
WHEEL
SID· SMSK
SMSK
A
RESET
Fbi
MASK
~
"H"~~
,.
I
ED
15 FF
SIN
INT REO
1
FF
FF
-
~
STATUS
rrd
C IO
S
DATA OUT BUfFER
I
CONTROL
16
rtl!f
CONTROL
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STATUS
DATA IN BUFFER
I
I
SIO
RIO DEV
WIO INT
~
,
~~
DEVICE
CONTROLLER
CONTROLLER
LOGIC
ON A
SELECTOR
CHANNEL
4"
•
.-
11
SAIOATAI
Ct4ANSO
DEVENO
ACKSA
Ct4ANACK
DEVNODI
StOENAILE
JUWMn
TOGGLE INXfEA
CHANSR
~s-e TOGGLE OUTXfEA
TOGGLE SIO OK
liED
PCMDI
sn JUMf'
'STAT STI
'CONT STI
'WRITE STI
RO NEXT
wo
"
'IIUOSTI
snlNT
EOT
SR CLOCK
'-
00
SCBUS
TO
DEVICE
CONTROLLER
Figure 7-18.
Selector Channel and Device Controller Simplified
Logic Diagram
7-39