Xycom XVME-560 Manual page 45

XVME-560 Manual
September, 1984
Standardized Module I/O Map
The 1K block of short I/O addresses (called the I/O Interface Block) allocated to each
XVME module is mapped with a standardized format in order to simplify programming
and data access.
identification information are uniform.
information is always found in the first 32 odd bytes of the module memory block --
with these addresses being relative to the jumpered
data address = base address + odd bytes 1H - 3FH). The byte located at base
address+81H on each module contains a Status/Control register which provides the
results of diagnostics for verification of the module's operational condition. The next
area of the module I/O Interface Block (base address + 82H - roughly 12OF) is module-
specific and it varies in size from one module to the next. It is in this area that the
module holds specific I/O status, data, and pointer registers for use with IPC protocol.
All intelligent XVME I/O modules have an area of their I/O Interface Blocks defined as
"dual access RAM."
modules access their command blocks and where XVME "master" modules could access
their command blocks (i.e., "master" modules can also access global system memory).
The remainder of the I/O Interface Block is then allocated to various module-specific
tasks, registers, buffers, ports, etc.
Figure A-2 shows an address map of an XVME I/O module interface block, and how it
relates to the VMEbus short I/O address space.
Interface Block may be accessed by simply using the address formula:
Module Base Address + Relative Offset = Desired Location
The locations of frequently used registers and module-specific
This area of memory provides the space where XVME Wave" I/O
For exam ple, the module identification
base address (i.e., Module I.D.
Notice that any location in the I/O
A - 3