1 0.6
Servicing the Burst Control Circuit
Theory of Operation
Introduction
Burst Number
Acceptors
This chapter covers the burst control circuit on the A2 control-board
that controls the output of the period generator on board
Al
(
See
Chapter 10-3), when burst mode is selected.
DATA BUS
DATA BUS
TRIGGER
INPUT
JLJL SQUARE OUTPUT
Figure 1 0.6-1 . Simplified Burst Generator
Figure 10.6-1 shows a simplified view of the burst-generator circuits.
The burst flip-flop is located on the main board, not on the control
board. Refer to Figure 10.6-2.
Operation of the burst control circuit can be categorised as follows:
•
Burst number acceptors
•
Counter
11
Blocking flip-flop
The burst number input from the front panel or system controller,
is loaded into latches
UlOO
and
UlOl
on receipt of
(
low byte
burst
)
and HBB
(
high byte burst
)
, from the control-board address
decoder. The LBC signal loads the preset burst number into the
counter circuits and resets the blocking flip-flop U109 which allows
the counter to start counting down.
Servicing the Burst Control Circuit 1 0.6-1
Summary of Contents for 8112A
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