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Chapter 3 Software Overview
© National Instruments Corporation 3-25 NI-VXI User Manual
address space for the source and destination, respectively. The width
parameter selects either byte, word, or longword transfers. If one of the
addresses selected has no device residing at the address and a bus error
occurs,
VXImove
traps the bus error condition and indicates the error
through the return status.
VXIout (accessparms, address, width, value)
VXIout
writes a single byte, word, or longword to a particular
VXI/VME address in one of the VXI/VME address spaces. The
parameter accessparms specifies the VXI address space, the VXI
privilege access, and the byte order to use with the access. The address
parameter specifies the offset within the particular VXI/VME address
space. The width parameter selects either byte, word, or longword
transfers. If the VXI/VME address selected has no device residing at
the address and a bus error occurs,
VXIout
traps the bus error
condition and indicates the error through the return status.
VXIoutReg (la, reg, value)
VXIoutReg
writes a single word to a particular VXI device’s VXI
registers within the logical address space (the upper 16 KB of VXI
A16 address space). The function sets the VXI access privilege to
Nonprivileged Data and the byte order to Motorola. If the VXI address
selected has no device residing at the address and a bus error occurs,
VXIinReg
traps the bus error condition and indicates the error through
the return status. This function is mainly for convenience and is a layer
on top of
VXIoutLR
and
VXIout
. If the la specified is the local CPU
logical address, it calls the
VXIoutLR
function. Otherwise, it calculates
the A16 address of the VXI device’s register and calls
VXIout
.
Note:
VXIoutReg
is designed to access a VXIbus device configuration register
and therefore is not applicable to VME devices.