User`s manual

The V743 shared memory is mapped into VXI A24 address space. Thus, the

memory is accessible from the V743 and from other devices such as the

Agilent E1406A Command Module. Notice that the V743 accesses the

memory as SHARED, and not from the A24 memory map (Figure 2-38).

V743-4B :

Assigning Interrupt

Lines

There are seven VME backplane interrupt lines. These lines are assigned to

devices by the resource manager during the system’s power-on or reset

sequence. When the V743 controller is the resource manager, it assigns line

1 to itself, and assigns lines 2 through 7 to other interrupt handlers in the

system. In systems containing a V743 controller (resource manager) and an

Agilent E1406A Command Module, the V743 will, by default, assign the

Command Module interrupt line 2 - if the Command Module has the next

lowest logical address.

Agilent Technologies’ register-based modules are factory-set to interrupt

line 1. This setting is selected on some modules by a finger-moveable

jumper; on others the jumper is soldered onto the module. When line 1 is

not assigned to the Command Module, you must either assign line 1, or

move the jumpers on its register-based servants to the corresponding lines.

An interrupt line can be assigned to the Command Module by modifying the

/usr/pil/etc/vxiLU/irq.cf configuration file. The location of this file depends

on the SICL logical unit number assigned to the VXI interface (default =

24). For example:

SICL Logical Unit Location of file "irq.cf"

24 /usr/pil/etc/vxi24/irq.cf

Example - Assigning

an Interrupt Line

As an example, to assign interrupt line 1 to the Command Module at logical

address 2:

1. Modify irq.cf by adding the line shown in bold on the next page.

2. Re-save the file and re-run the resource manager utility

ivxirm. Run ivxisc

/usr/pil/etc/vxi24

and verify that the interrupt line has been assigned.(The

"Interrupt Request Lines" section of the configuration sequence will show if

the line has been assigned.)

C-Size Configuration Guide Setting Up an Embedded V743 Controller 2-47