VT1433B User's Guide

Register Definitions

￿Control Register: A write to this register causes specific actions to be executed by the device. The actions are described in the following table.

Bit

15

14-2

1

0

Contents

A24/A32

Unused

Sysfail Inhibit

Reset

Enable

 

 

 

 

A24/A32 Enable: A one (1) in this field enables access to the device’s A24 VME Bus registers. A zero (0) disables such access.

Sysfail Inhibit: A one (1) disables the device from driving the SYSFAIL* line.

Reset: A one (1) forces the device into a reset state.

￿Offset Register: This read/write register defines the base address of the device ’s A24 registers. The four most significant bits of the Offset register are the values of the four most significant bits of the device’s A24 register addresses. The 12 least significant bits of the Offset register are always zero (0). Thus, the Offset register bits 15-12 map the VME Bus address lines A23-A20 for A24 register accesses. A read of the Offset register always returns the address offset most recently written to the Offset register.

￿Port Control Register: This register is used to override the Local Bus control of the device. (This applies to VT1433B modules that are equipped to use Local Bus). It has the following format:

Bit

15-2

1

0

Contents

Unused

LBus

LBus

Pipe

Enable

 

 

LBus Pipe: Writing a one (1) puts the Local Bus into pipeline mode, if the LBus Enable bit is also set. Writing a zero (0) allows the Local Bus to operate in some other mode.

LBus Enable: Writing a one (1) enables the Local Bus interface. Writing a zero

(0) disables the local bus interface. RESET VALUE: 0

A-7

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VXI VT1433B manual Bit 15-2 Contents Unused LBus Pipe Enable

VT1433B specifications

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