IBM System/370 145 Reference Summary page 41

El
CPU CLOCK INFORMATION
CLOCK CARD LOCATIONS
AGATE BGATE
Al - K2 Al -C4
A2-C4
A3-C4 83- V3
A4-Q4
C3-J2
81 -C4°
82-M2
B3-H4
84- K2
Cl -G2
C2-J2
C3 -G4
C4- E2
0
81·84 if IFA
CLOCK TIMING CHART
OTime
0 Delayed
1 Time
1 Delayed
2Time
2 Delayed
0 45 90 135
CYCLE TIME FOR CONTROL WORDS
PIN LOCATIONS OF TIMING
PULSES ON EACH CLOCK CARD
+OTime- G05
-OTime-
J07
+O Delayed- Dll
-0 Delayed-
G07
+1 Time-
813
-1 Time-
J09
+1 Delayed-
J02
-1 Delayed-
J13
+2 Time- J12
-2 Time- G13
+2 Delayed- D04
-2 Delayed-
G12
OSC Sync Point GlO
180
225 270 315
202.5 ns
l
Note: Cycle times in the logic pages appear as 180, 225, 270 cycles-
247,5 ns A delay of 22.5 nanoseconds is added to each of these cycles to
292.5 ns obtain the cycle times of 202.5 to 292.5. Two delays are added to
315.0 ns
obtain the 315-cycle time, Refer to the control-word section for
details on cycle times for each word type.
2.14