General Description; Vmebus Characteristics; Vmebus Slave-Addressing - National Instruments GPIB-1014 User Manual

General Description

Bus Signals
BR0*-BR3*
BBSY*
IACKIN*
IACKOUT*
IRQ1*-IRQ7*
BERR*
SYSFAIL*
SYSRESET*
All GPIB transceivers meet the requirements of the IEEE 488 standard. The components used
are as follows:
Transceivers
Data Transceivers
Control Transceivers
Note:
The GPIB-1014 requires regulated +5 VDC power from the VMEbus. Current load is
typically 1.6 A (2.0 A maximum).

VMEbus Characteristics

The following paragraphs describe each of the VMEbus modules on the GPIB-1014: slave,
master, interrupter, and requester. Table 2-5 at the end of this chapter summarizes the
capabilities of these modules.

VMEbus Slave-Addressing

The GPIB-1014 occupies 512 bytes (256 words) in the A16 (short) I/O space. As a VMEbus
slave, it only responds when the address modifier (AM) lines specify a short supervisory access
(AM code = 2D) or a short nonprivileged access (AM code = 29). The board responds to short
16-bit addresses. The GPIB-1014 compares address lines A15 through A9 with its base address
GPIB-1014 User Manual
Table 2-1. GPIB-1014 Signals (continued)
2-2
Driver Device Receiver Device
Part Number Part Number
AS756
AS756
–
F1241
74145
–
AS756
–
Component Designation
DS75160AN
DS75162AN
© National Instruments Corporation
Chapter 2
LS241
LS240
LS240
–
–
F1241
–
LS240