Chapter 4: Programming Interface; Memory Map; I/O Map; Table 4-1. I/O Map - RadiSys EPC - 6A Hardware Reference Manual

Chapter 4
Programming Interface
This chapter describes the EPC-6A as seen by a program. Wherever possible, users should
avoid direct use of most of these facilities. Hardware features in common with standard
PCs should be accessed by standard BIOS calls. Hardware unique to EPC-6A, such as the
VMEbus interface should be accessed through a variety of software packages and drivers
available with the EPC-6A.

Memory Map

Memory at addresses between 0 and 4 MB (0FFFFFh) are mapped as follows:
Range
000000h – 09FFFFh
0A0000h – 0BFFFFh
0C0000h – 0C7FFFh
0C8000h – 0DFFFFh
0E0000h – 0EFFFFh
0F0000h – 0FFFFFh
100000h – 3FFFFFh
400000h – F7FFFFh
F80000h – FFFFFFh

I/O Map

The following defines the I/O addresses decoded by the EPC-6A. It does not define
addresses that might be decoded by the installed EXM.
Port
00
01
02
03
04
05
06
07
08
09
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com

Table 4-1. I/O Map

Functional group Usage
DMA Channel 0 address
Channel 0 count
Channel 1 address
Channel 1 count
Channel 2 address
Channel 2 count
Channel 3 address
Channel 3 count
Command/status
DMA request
Content
DRAM
Uncommitted, EXM bus or VIDBIOS
Uncommitted, DRAM, EXM bus or VIDBIOS
Uncommitted, mapped to EXM bus
Mappable window onto VMEbus
System BIOS
DRAM
Uncommitted, EXM bus
BIOS ROM
4
17