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Publication No. 980938 Rev. K
Model T940 User Manual
Astronics Test Systems
DR1 Driver/Receiver Board B-3
AUX EN[9:12]
50
Ω
-2V
MC100ELT24
50
Ω
VBB
MC100ELT25
MC100ELT24
DB
FRONT
PANEL
AUX DATA[9:12]
AUX [9:12]-
AUX [9:12]+
33
Ω
74LVC2G125
Rt = 50
Ω
74LVC2G125
AUX [5:8]
AUX EN[5:8]
AUX DATA[5:8]
AUX RH[9:12]
AUX RH[5:8]
I/O CONTROL
Figure B-2: Auxiliary Driver & Receiver I/O Block Diagram
Signal Descriptions
AUX EN[5:8]
Auxiliary Enable outputs from the Data Sequencer to the
LVTTL output buffers.
AUX DATA[5:8]
Auxiliary Data outputs from the Data Sequencer to the
LVTTL output buffers.
AUX RH[5:8]
Auxiliary Response High inputs to the Data Sequencer
from the LVTTL input buffers.
AUX RH[9:12]
Auxiliary Response High inputs to the Data Sequencer
from the ECL input buffers.
AUX DATA[9:12] Auxiliary active high Data outputs from the Data
Sequencer to the ECL output buffers.
AUX EN[9:12]
Auxiliary active low Data outputs from the Data Sequencer
to the ECL output buffers.
EN 9-12
Auxiliary Enable outputs from the Data Sequencer to the
ECL output buffers.
I/O CONTROL
Signals used to control isolation relays and ECL
bipolar/differential mode.
AUX [5:8]
Four LVTTL signals used to input or output test signals.
See
Chapter 5
.
VBB
ECL input threshold (~ -1.3V).
AUX [9:12]-
Four negative differential signals used to input or output
test signals. See