GND
1,3,5,7,9,11
DC common for all interface signals.
ICB Connector
This 20-pin ribbon connector, J106, provides all the necessary signals for connecting
the Instrument Control Bus (ICB). Negative true signals are shown with a trailing as-
terisk; Address/Data signals (LDn) are positive true.
Pin
Signal
Pin
Signal
1
GND
2
LD0
3
LD1
4
GND
5
LD2
6
LD3
7
GND
8
LD4
9
LD5
10
GND
11
LD6
12
LD7
13
GND
14
LWE*
15
GND
16
LDS*
17
GND
18
LAS*
19
GND
20
LSRQ*
Interface Signal Functions
This section describes the function of each interface signal in detail. All input and out-
put signals are TTL compatible. Unless otherwise noted, the input signal levels are:
Low = 0 to 1.0 volts
High = 2.0 to 5.0 volts
And the output signal levels are:
Low = 0 to 0.5 volts
High = 3.0 to 5.0 volts
All input and output signals considered to be a logic 1 for a high voltage level unless
the signal name is followed by an asterisk (LWE*), in which case the signal is consid-
ered to be a logic 1 for a low voltage level. The direction of the signal is referenced to
the amplifier.
Appendix C - Data and ICB Interface Connectors
80
Model 9660-9660A ICB Digital Signal Processor
