
7. VXIbus Interface
This chapter describes the EPC-7 VXIbus interface as seen by a program. Wherever
possible, users should avoid direct use of most of these facilities. The VXIbus
interface should be accessed through RadiSys' EPConnect software, an easy-to-use,
high-level interface that frees you from most machine-dependent considerations.
Concepts
Memory Map
VMEbus accesses are available either by mapping a 64K segment of the VMEbus
through the 0E0000-0EFFFF "E page" window or by direct mapping above 256 MB.
The following summarizes the source of the VMEbus address lines for accesses
through the E page.
A32
7
7
31
24 23
22
21
15
16
0
From
port
8150
From
port
8151
From
port
8130
From
486 address
bits 15-0
A24
23
22
21
15
16
0
From
From
port
8151
port
8130
From
486 address
bits 15-0
A16
15
0
From
486 address
bits 15-0
It should be noted that the EPC-7 drives all 32 address lines even when performing an
A24 or A16 access. Therefore, all the above registers (8150, 8151, 8130) should be
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