Horizontal And Vertical Display Response - Tektronix 2246 1Y Service Manual

Theory of Operation—2246 1Y and 2246 Mod A Service
Delay
and
Vertical
Modes
DD VM1 VMO
0
0 0
or
1
0 0
1
0 0
or
1 0 1
0 1 0
0 1 1
1 1
0
1 1 1
NOTES:
(a) NSSS = Complete A Sweep cycles in a single sequence.
(b) Not applicable in single sequence mode.
(c) Signal state not affected by readout.
(d) Signal changes state a fte r each rising edge of THO; initialized to a high state in single sequence mode.
(e) Signal changes state a fte r every other rising edge of THO; it is initialized to a high state in SGL SEQ mode.
(f) NSSS = Two times the number of states programmed into the vertical sequencer. In ALT Vertical Mode with no
measurement, the vertical sequencer advances to its next state at the end of every other A GATE.
3-24
Table 3-16

Horizontal and Vertical Display Response

HORIZONTAL CONTROL SIGNAL OUTPUTS
Signal Horizontal Modes (HM1 HMO)
Names
A Only
(0 0)
1
NSSS (a)
DS HI
HDO HI
HD1 LO
TS LO
NSSS (a) 2
(d)
DS
HDO
HI
HD1 LO
TS
LO
NSSS (a) (f)
HI
DS
HDO HI
HD1
LO
TS LO
(g)
NSSS (a)
HI
DS
HI
HDO
LO
HD1
LO
TS
(f)
NSSS (a)
(1 )
DS
HDO HI
HD1
LO
TS LO
(g)
NSSS (a)
<h)
DS
HDO HI
HD1
LO
TS LO
Readout Inactive (ROR = 1 )
A Alt B B Only
(0 1)
(1 0)
2
HI HI
<d)
HI
RDO HI
HD1 LO
4
(e) (d)
(d)
LO
FIDO HI
HD1
LO
(f) (f)
HI HI
(d) LO
HDO HI
HD1 LO
(g) (g)
HI
HI
(h)
LO
HI
HDO
LO
HD1
(f)
(f)
(i) (i)
(h)
LO
HI
RDO
HD1 LO
(g) (g)
(h) (h)
(h)
LO
HDD HI
HD1 LO
Readout
Active
X/Y
(ROR = 0)
(1 1)
(b)
1
HI
LO
HI
LO
(b)
2
LO
HI
HI
LO
(b)
HI
HI
HI
LO
(b)
HI
HI
HI
LO
(b)
(i)
HI
HI
LO
(b)
(h)
HI
HI
LO
(c)
(C)
LO
LO
LO
(c)
(c)
LO
LO
LO
(c)
(c)
LO
LO
LO
(c)
(c)
LO
LO
LO
(c)
(c)
LO
LO
LO
(c)
(c)
LO
LO
LO