
Publication No. 980938 Rev. K
Model T940 User Manual
Astronics Test Systems
DR2 Driver/Receiver Board C-5
digital board to interface and configure the hardware.
Signal Descriptions
I/O CONTROL
Signals used to control isolation, ECL mode and NV data.
MP SIG
Multi-Purpose signal from the data sequencer.
MF SIG
Multi-Function signal output to the PWR connector.
CBUS
An internal Control Bus connecting the digital board to the
Driver/Receiver board.
Firmware & NV Data
The Control Logic firmware is loaded via a serial PROM on power up or VXI
Reset. The firmware is field upgradeable using our supplied loader utility.
Nonvolatile data (serial number, assembly revision is stored in an on-board
EEPROM.
Signal Descriptions
I/O CONTROL
Signals used to program firmware and NV DATA.
DR2 Characteristics
Table C-1: DR2 Characteristics
Description
Characteristics
Digital I/O Type
LVDS (SN65LVDM176D)
Channels
32 differential per Driver/Receiver board
Output Voltage
VOL: 454 mV (max)
VOH: 247 mV (min)
Differential Input Voltage
200 mV min
Output Drive Current (typical)
Source/Sink: ±8 mA
I/O Impedance
100 Ω in parallel with 20K pull-up/pull-down
bias resistors to establish a True level if
unconnected
Skew (Channel-to-Channel)
< 3 ns (drive and compare)
Auxiliary I/O Channels
(per Driver/Receiver board)
LVDS (4), Differential (with 20K bias resistors)
LVTTL (4), Single-ended
ECL (4), Single-ended or Differential
AUX I/O is bi-directional
Per channel relay isolation on ECL I/O
Data Rate (max)
50 MHz (input and output)