User`s guide

110 Agilent VISA User’s Guide
4 Programming via GPIB and VXI
VXI and GPIB-VXI Specific MEMACC Attributes
The following attributes, most of which are read/write, provide memory
window control information.
Table 23 Attributes That Provide Memory Window Control
Information
Attribute Description
VI_ATTR_VXI_LA Logical address of the local controller.
VI_ATTR_SRC_INCREMENT Used in viMoveInxx operation to specify
how much the source offset is to be
incremented after every transfer. The
default value is 1 and the viMoveInxx
operation moves from consecutive
elements.
If this attribute is set to 0, the viMoveInxx
operation will always read from the same
element, essentially treating the source as a
FIFO register.
VI_ATTR_DEST_INCREMEN
T
Used in viMoveOutxx operation to specify
how much the destination offset is to be
incremented after every transfer. The
default value is 1 and the viMoveOutxx
operation moves into consecutive elements.
If this attribute is set to 0, the
viMoveOutxx operation will always write
to the same element, essentially treating the
destination as a FIFO register.
VI_ATTR_WIN_ACCESS Specifies modes in which the current
window may be addressed: not currently
mapped, through the viPeekxx or viPokexx
operations only, or through operations
and/or by directly de-referencing the
address parameter as a pointer.
VI_ATTR_WIN_BASE_ADD
R
Base address of the interface bus to which
this window is mapped.
VI_ATTR_WIN_SIZE Size of the region mapped to this window.