Control Data Cyber 170 State Hardware Reference Manual page 215

PP Programming
PP INSTRUCTIONS
76 AND 77
PP INSTRUCTION
74
PP INSTRUCTIONS
70 AND 71
PP INSTRUCTION
75
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S B L ORIGIN
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FUNCTION
Pf'
,
,
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6
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,
8
,
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ACTIVE PP
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/
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: ; D A T A : D A T A ;
;
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12-BIT WORD ED I I
+ 1
BIT PARITY
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FULL ED
t
REPEATS FOR EACH WORD
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EMPTY
PP
INACTIVE ED
INACTIVE PP
(ALTERNATE)
DISCONNECT (END OF DATA)
NOTES:
1
TlME I S A FUNCTION OF EXTERNAL DEVICE (ED). PP RECOGNIZES INACTIVE 1 MAJOR O
CYCLE (OR A MULTIPLE OF MAJOR CYCLES) AFTER FUNCTION. THE PP MUST PREVIOUSLY
RECEIVE INACTIVE.
2 TlME IS A FUNCTION OF PERIPHERAL PROCESSOR
IPP).
MINIMUM TlME IS 1 MINOR CYCLE.
O
ACTUAL TIME IS A FUNCTION OF THE W PROGRAM.
@
TlME IS A FUNCTION OF ED.
4 TlME IS A FUNCTION OF PP. MINIMUM TlME IS 1 MINOR CYCLE. MAXIMUM TlME IS UP
'
TO I MINOR CYCLES TO ALLOW OPERATION WITHIN 1 MAJOR CYCLE.
5 TlME IS A FUNCTION OF PP. MINIMUM TlME IS 2 MAJOR CYCLES. MAXIMUM TlME IS
O
AN INTEGRAL MULTIPLE OF MAJOR CYCLES.
@
TlME IS A FUNCTION OF ED.
7.
MAJOR CYCLE TIME IS 250 NS.
8. MINOR CYCLE IS W NS.
9
TlME IS A FUNCTION OF ED. FULL SHOULD PROCEED THE DATA BY A MINIMUM OF 5 NS
O
I15 NS MAXIMUM) TO REMOVE THE CLEAR ON THE INPUT DATA RECEIVERS.
10 PP MAY DISCONNECT AFTER EMPTY SIGNAL OF ANY ED WORD. STATUS REQUEST
O
DISCONNECTS I N THIS MANNER.
@
CHANNEL MUST BE PREVIOUSLY INACTIVE.
@
CHANNEL REMAINS ACTIVE UNTl L ED SENDS INACTIVE.
@
CHANNEL MUST BE PREVIOUSLY INACTIVE.
Figure
5-8. Data Input Sequence Timing