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GTXI User's Guide
Memory Address Space
The basic ISA PC bus memory space is 16MByte - 000000h-
FFFFFFh. The GTXI buffer divides the memory space between
0D0000h and 0EFFFFh into four predefined groups of 32KB. Each
group can be assigned to the GTXI platform. One user-defined
memory space is also available. The programming of memory space
is done using three registers: MSA, MSE and MMR.
Memory Start Address Register (MSA)
Internal address (IA) is 2.
Bit# 15-8 7-0
Function U A23-A16
Table D-6: Memory Register MSA Bit Functions
U
Unused
Axx
These bits correspond to ISA address bits 23-16 and
define the first address of the user-defined memory block
MEMS0. The address can be calculated by multiplying
the value in bits 0-7 by 64KB. The default value for these
bits is all ‘0’s.
Memory End Address Register (MEA)
Internal address (IA) is 3.
Bit# 15-8
7-0
Function U
A23-A16
Table D-7: Memory Register MEA Bit Functions
U
Unused
Axx
These bits correspond to ISA address bits 23-16 and
d fi
h fi
dd
f h
d fi
d
bl
k
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