•
•
•
XVME-956 Manual
August 1994
NOTE
The memory window size is 64 Kbytes. Devices containing 32 Kbytes
appear at the window address at offset 0 and are duplicated at offset 8000h.
Programmers must be aware that BIOS extension programs triggered by
55AAh may reinstall themselves since they might appear more than once in
the microprocessor's address space. The optional Ampro XVME-956/101
Support Software will not reinstall itself.
5.9 B O A R D NUMBER
The BDO and BD1 bits in Control Register 1 select the desired module. Each XVME-956/101 module is
jumpered for a particular board number, 0 to 3, corresponding to the values of BDO and BD1. Only one
module per control register I/O port address may be jumpered to a given board number. A t power up, the
control registers of all XVME-956/101 modules are reset to 0.
Multiple XVME-956/101 modules with board number 1, 2, or 3, may be used if they are jumpered for
different control register I/O ports. Yo u must be sure the software disables the modules at one I/O address
before enabling a module at a different I/O address.
A module jumpered to board number 0 is different. A system may contain
at most
one module with Board
number 0.
5.10 W I N D O W ADDRESS SELECTION
The XVME-956/101 unit memory appears in a 64K window at either D0000h or E0000h. T h e address
of the window is jumper selected.
5-25
