Xycom XVME-956 Series Manual page 72

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5.3 G E N E R A L MODULE SETUP
This section describes how to configure the following:
• W i n d o w Address
• S y s t e m Power Fail Interrupt
• C o n t r o l Register Address
• B o a r d Number
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5.3.1 W i n d o w Address Selection (W11)
The expansion memory appears in a 64K window at address D0000H or E0000H. T h e XVME PC/AT
CPUs use the E0000H block for VMEbus Real Mode Window accesses. I f code on the memory
expansion module will require use of the VMEbus Real Mode Window, the memory expansion module
must reside at D0000H. T h e expansion module requires the use of the entire D0000H segment of
64 Kbytes. I f another PC/AT device resides anywhere within this 64K block, e.g. at D0000H,
contention will occur if W11 7/8 is open. I f W11 7/8 is shorted, selecting E0000H, the code on the
memory expansion module, cannot access the VMEbus through the Real Mode Window. This is
because the Real Mode Window resides at E0000H.
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The jumper tables use the convention "I" to mean the two pins shorted.
This means that "3/4", (pins 3 and 4), of the jumper array are connected
with a shorting block.
Table 5-2. Window Address Selection (W11)
JUMPER
W11 7/8 open*
W11 7/8 shorted
*Default
NOTE
FUNCTION
Selects window address D0000h
Selects window address E0000h
XVME-956 Manual
August 1994
5-3