Table of Contents
Advertisement
Block Diagram
Description
Module Control
ID EEPROM
Input and Output Circuit
Power Supplies
10 Getting Started
Artisan Scientific - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisan-scientific.com
Figure 1-1 shows a simplified block diagram of the Agilent E2259A. In
order to effectively program the module you must understand its operation
at a block diagram level. The following paragraphs describe the major
sections in the block diagram.
This block contains all of the logic for the module including carrier
interface, registers, interrupt control, the programmable busy timer, I/O
lines, control lines, etc. All lines except the latched data output lines (BC0 -
BC15) connect directly to the U101 controller FPGA.
The I/O register at 14H in A24 memory space is realized on this Breadboard.
Writing to this register automatically outputs the data on the BC0 - BC15
lines; similarly, reading this register automatically reads the data on the TR0
- TR15 lines. More I/O registers can be expanded by using the decoder lines
and additional circuits.
The ID EEPROM holds sixty-four 16-bit words of M-Module ID data and
VXI M-Module data.
The breadboard data input lines (TR0 - TR15) connect directly from the
J103 pads to the U101 controller FPGA. The data output lines (BC0 - BC15)
are latched by U107 and U108 (74ACTQ273SM) and are available on J103.
Control lines (LAT*, DBEN*, CRST*, etc.) and the I/O Decoder lines (WP0
- WP7 for write decoder lines and RP0 - RP7 for read decoder lines) are
available on J102. Refer to Chapter 2 for information on using these lines.
The Agilent E2259A Breadboard provides filtered ±12VDC and +5VDC
supplies for use on the breadboard. Do not exceed the maximum current
specifications for the breadboard (see Appendix A). The active electronics
provided on the module use only the +5VDC supply.
Each power supply is protected by a positive-temperature-coefficient
thermistor. When maximum current through the thermistor is reached, its
resistance increases significantly thereby limiting the current; the thermistor
acts like a resettable fuse. Table 1-1 lists the power supplies, thermistor
protection reference designator (silkscreened on PC board), and the
maximum current.
Table 1-1. Agilent E2259A Power Supply Protection
+5VDC Supply
+12VDC Supply
-12VDC Supply
Thermistor Ref.
Maximum Current
Designator
F201
F200
F202
1000mA
200mA
200mA
Advertisement
Table of Contents
