Xycom XVME-560 Manual page 8

XVME-560 Manual
September,
1984
1.3.1 Analog Circuitry
As can be seen from Figure l-1, the application circuitry consists primarily of the 12-
bit A/D converter and its related signal conditioning components listed below:
Multiplexer: directed by software (see Chapter 3) to select one channel for data
conversion.
Buffer (Instrumentation Amplifier): provides a high impedance front end to the
analog signal coming out of the multiplexer.
Programmable Gain: allows a gain of 1, 2, 4 or 8 to be selected for increased
conversion resolution on smaller input signals.
Sample and hold: samples the input signal for 23 usec to allow for "settling
time" in the Instrumentation Amplifier and gain circuitry. This signal is
then "held" until the conversion is completed.
Interrupt circuitry:
Section 3.8).
1.3.2 XYCOM Non-Intelligent Kemel
The Non-Intelligent Kernel is basically the interface to the VMEbus. It provides all
the necessary circuitry to
specification for a 16-bit
case circuitry),
A/D
following features:
Control and Address Buffers
Address Decode circuitry
l
Interrupt
l
l
Control/Status
l
Module identification information
l Pass and Fail LED indicators
The XYCOM Non-Intelligent Kernel is described in further detail in Appendix A.
1.4 FEATURES OF XYCOM'S STANDARD I/O ARCHITECTURE
The AIN and all XYCOM
I/O
Architecture. This architecture is intended to make the programming of
VMEbus I/O modules simple and consistent.
operation of the AIN.
Module Address - The AIN can be located at any one of 64 base addresses
in VMEbus Short I/O memory.
allows a conversion completion to generate an interrupt (see
receive and generate the signals required
slave. By simply adding the application circuitry (in this
module
a VMEbus is complete. The Non-Intelligent Kernel
Decoder/Driver
Register
modules conform to the unique XYCOM VMEbus Standard
I/O
by the
The following features apply to the
l-3
VMEbus
has the
XYCOM