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INHS, and
the
CKI1
inverted
signal
passed
via
the
counter
are applied
to
the burst gate generator.
The
HSYNC
is
changed
to
L
at
the
trailing
edge,
and back
to
H
after
counting
CKI1 by
17
(pulse
width
of
3.6 to
3.8(isec),
resulting in
output of
BGP
from
pin
16
for
use
in
burst
ATT
circuit
switching.
The
same
burst gate generator
is
also
used
to generate
BGP2
and
BGP1
outputs
for
control
of the pin
19
/
pin
21
open
drain
output
burst
sampling
circuit.
Relevant
waveforms
are
shown
in
Photo. 13-24
APPROX
,
450nS
3.6—
3.SJJS
Fig.
13-56 Relevant
waveforms
in
computer
mode
Fig.
13-57 Synchronizing
pulse generator
(Computer
mode)
1 1
B
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