Tektronix 11A52 Service Manual page 32

Theory of Operation
TABLE 2-4 U600 Signals (continued)
Signal Pin Desc Usage
AD3 14
Bi Address input, data input, and data output
AD4 13
Bi Address input, data input, and data output
ADS 12 Bi Address input, data input, and data output
AD6
11
Bi Address input, data input, and data output
AD7 10
Bi Address input, data input, and data output
FETCH(L) 19 0 The FETCH output is the "AND" of RD and PSEN.
When FETCH is low, the RAM (U801) can send data to
the data bus if the RAM chip select is enabled
SCLK 29 I Sequence clock;, positive edge increments the channel
switch sequencer
SYNC 30
I Sequence sync, high level applied during SCLK high
clears the channel switch sequence counter.
CLK 5,27 I Serial communications clock input
M-P 26
I Oscilloscope to plug-in serial data input
GSl(L)
6
0 Channel 1 gain/ bandwidth setting strobe
GS2(L)
44
0 Channel 2 gain/ bandwidth setting strobe
BPO 47 0 Bandwidth bit 0
BPl 48
0 Bandwidth bit 1
GPO 49
0 Gain bit 0
GPl
so
0 Gain bit 1
GP2 Sl 0 Gain bit 2
DO
61 0 DAC data bit 0
Dl
60
0 DAC data bit 1
D2 S9
0 DAC data bit 2
D3 S8
0 DAC data bit 3
D4 S7 0 DAC data bit 4
DS S6 0 DAC data bit 5
D6 SS 0 DAC data bit 6
D7 54 0 DAC data bit 7
MINSTB(L) 62 0 Sample/Hold module #2 sample strobe
MAJSTB(L) 63 0 Sample/Hold module #1 sample strobe
ARAO S2 0 Sample/Hold module output select address bit 0
ARAI
S3
0 Sample/Hold module output select address bit 1
ARA2 46 0 Sample/Hold module output select address bit 2
LCLK(L)
66
0 DAC data latch strobe low byte
UCLK(L) 6S 0 DAC data latch strobe high byte
TRIGONl 31 0 Channel 1 triE:E:er path on
TRIGINVl 32 0 Channel 1 trigger path invert
DISPONl 28 0 Channel 1 display path on
DISPINVl 4 0 Channel 1 display path invert
TRIGON2
34
0 Channel 2 trigger path on
TRIGINV2(L) 3S 0 Channel 2 trigger path invert
DISPON2 33
0 Channel 2 display path on
DISPINV2(L) 2 0 Channel 2 display path invert
RMSTEST
39
0 Self-test of RMS detector; on=high, off=low
RMS INV 40 0 Self-test of RMS detector polarity
P-M 7 0 Plug-in to oscilloscope serial data
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11A52 Extended Service Manual