Memory And Port Maps; Memory Map - Tsi148 Based Pci-To-Vme Bridge; I/O Port Map; Table 2-1 V7865, Tsi148 Memory Address Map - GE V7865 Series Hardware Reference Manual

2.3 Memory and Port Maps

2.3.1 Memory Map - Tsi148 Based PCI-to-VME Bridge

The memory map for the V7865 is shown in Table 2-1. All systems share this same
memory map.

Table 2-1 V7865, Tsi148 Memory Address Map

MODE
BIOS will also map onboard PCI based NVRAM, Timers and Watchdog Timers in this area.
** This space can be allocated as shared memory (for example, between the BGA CPU and VME Master). Note
that if a PMC board is loaded, the expansion BIOS may be placed in this area.

2.4 I/O Port Map

Like a desktop system, the V7865 includes special input/output instructions that
access I/O peripherals residing in I/O addressing space (separate and distinct
from memory addressing space). Locations in I/O address space are referred to as
ports. When the CPU decodes and executes an I/O instruction, it produces a 16-bit
I/O address on lines A00 to A15 and identifies the I/O cycle with the M/I/O control
line. Thus, the CPU includes an independent 64 KByte I/O address space, which is
accessible as bytes, words or longwords.
Standard hardware circuitry reserves only 1,024 byte of I/O addressing space
from I/O $000 to $3FF for peripherals. All standard PC I/O peripherals, such as
serial and parallel ports, hard and floppy drive controllers, video system, real-
time clock, system timers and interrupt controllers are addressed in this region of
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NOTE
Memory capacity may be extended as parts become available.
MEMORY ADDRESS RANGE
$FFFF 0000 - $FFFF FFFF
$C000 0000 - $FFFE FFFF
$0010 0000 - $BFFF FFFF
$E0000 - $FFFFF
$D8018 - $DFFFF
$D8016 - $D8017
$D8014 - $D8015
$D8010 - $D8013
$D800E - $D800F
$D8000 - $D800D
$C8000 - $D7FFF
$C0000 - $C7FFF
$A0000 - $BFFFF
$00000 - $9FFFF
* This space can be used to set up protected mode PCI-to-VME windows (also referred to as PCI slave images).
SIZE DESCRIPTION
64 KByte ROM BIOS Image
0.9 GByte Unused *
3 GByte Reserved for **
Onboard Extended Memory
(not filled on all systems)
128 KByte
32 KByte
2 bytes
2 bytes
2 bytes
Reserved for BIOS Area
2 bytes
14 bytes
64 KByte
32 KByte
128 KByte
640 KByte