CH Tech Pulse Generator User Manual

Page 15

3.5

CONFIGURATION REGISTERS

There are several types of registers used to configure and control the VX462B. The VXI
configuration registers provide for control and status as required by the VXIbus specification.
The other register provides board-level control and status of the pulse repetition interval, pulse
width, trigger modes and delay times, and output amplitude. An address map of the registers is
shown in Table I.

3.5.1 VXI Configuration Registers

The VXI configuration registers contain basic information needed to configure a VXIbus system.
The configuration information includes: manufacturer identification, product model code, device
type, memory requirements, device status, and device control. The registers are briefly described
below and are detailed in Figure 5.

VXI Identification (ID) Register (Base + 00h) - A read of this register provides
manufacturer identification, device classification (i.e., register based), and the addressing
mode (A16). A write to this register has no effect.

VXI Device Type Register (Base + 02h) - A read of this register provides the model code
identifier. A write to this register has no effect.

VXI Status/Control Register (Base + 04h) - A read of this register provides the state of
P2 MODID* line, and the Ready and self-test Passed status. A write to bit 0 of this
register provides a reset of the module. SYSFAIL* is not implemented on this module.

Table I. VXI Register Address Map

A16 Address

Write Register Description

Read Register Description

Base + 12

High Reference Register

Base + 10

Low Reference Register

Base + 0E

Pulse Control Register

Base + 0C

Pulse Width Register

Base + 0A

Delay Register

Base + 08

PRI Register

Base + 06

VXI Unused Register

Base + 04

VXI Control Register

VXI Status Register

Base + 02

VXI Read Only Register

VXI Device Type Register

Base + 00

VXI Read Only Register

VXI ID Register

Bit

D15 . . . . . D00