Chapter 4
Nonvolatile Configuration
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National Instruments Corporation
4-5
configured to be in a slot other than Slot 0 must have a Model Code greater
than 0FFh. The GPIB-VXI/C Model Codes are assigned by National
Instruments. This field is used only to configure which one of the two
GPIB-VXI/C Model Codes to use. The factory setting is for Slot 0.
Slave Address Space
The GPIB-VXI/C can be configured to share 0%, 25%, 50%, or 100% of
its onboard RAM with the VXIbus in either A24 or A32 address spaces.
The percentage shared with the VXIbus is set via switches S1 and S2.
Refer to Table 2-4,
, for more information.
The VXI address space to be shared with the local RAM is set with
this field in nonvolatile configuration mode. The factory setting is 0%
dual-ported RAM.
Protocol Register
You can configure the GPIB-VXI/C to have a user-defined Protocol
register. Only the FHS* and INT bits are not permitted to be active.
RESET Configuration
The GPIB-VXI/C has three configurable reset parameters. They can be
enabled or disabled and are as follows:
•
Pushbutton resets backplane (asserts SYSRESET* signal).
•
Pushbutton resets GPIB-VXI/C (asserts local reset signal).
•
Backplane SYSRESET* signal resets GPIB-VXI/C (SYSRESET*
on backplane asserts local reset).
Serial Number
The serial number is a 32-bit quantity used to identify a particular
GPIB-VXI/C. This value is set at the factory and cannot be altered.
pSOS Region 1 Size
pSOS Region 1 is the Dynamic Memory pool used for the majority of
memory requirements of the GPIB-VXI/C. All process control blocks
(PCBs), process stacks, queues, messages, GPIB buffers, and so on,
are allocated from this region. The first 64 KB (0 to FFFFh) of any size
onboard RAM configuration are reserved for use by National Instruments.
You can allocate the rest for Region 1, Code Instruments, or a
