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Register Descriptions Chapter 4
GPIB-1014 User Manual 4-64 © National Instruments Corporation
Configuration Registers
The GPIB-1014 contains two 8-bit write-only registers that are used to configure some of the
board operating parameters.
Configuration Register 1 (CFG1)
VMEbus Address: Base Address + 101 (hex)
Attributes: Write Only, Internal to DMAC
6543210
W
INTRQ BRG
ROR*
CC
7
DIR
Configuration Register 1 (CFG1) is an 8-bit write-only register used to configure the GPIB-1014
parameters. The register bits define the following operating parameters.
Bit Mnemonic Description
7-5w INTRQ Interrupt Request Bits 7 through 5
The interrupt request bits are used to select one of the seven VMEbus
interrupt request lines used by the board to request service from the
interrupt handler of the CPU.
000 = No interrupt request line selected
001 = Interrupt request line IRQ1 selected
010 = Interrupt request line IRQ2 selected
011 = Interrupt request line IRQ3 selected
100 = Interrupt request line IRQ4 selected
101 = Interrupt request line IRQ5 selected
110 = Interrupt request line IRQ6 selected
111 = Interrupt request line IRQ7 selected
No interrupt request line is selected after power-up or after the board is
reset.