Address Maps; Memory Map; Video Subsystem; Bcm Advanced Research - BCM Advanced Research IN440EX User Manual

• PCI memory space on top of main memory.
Any access to the PCI or AT bus.
•

Address Maps

Memory Map

The following table describes the breakdown of the IN440EX memory areas and how
they are assigned.
LOCATION
0FFFFFFF-FFFFFFFF 256MB
000E0000-000FFFFF 128KB
000C8000-000DFFFF
000C0000-000C7FFF
000A0000-000BFFFF 128KB
00080000-0009FFFF 128KB
00000000-0007FFFF 512KB

Video Subsystem

3D RAGE PRO Graphics Controller is a highly integrated graphics controller.
Incorporated within this single chip are the 2D, 3D and video accelerators, palette DAC,
and quadruple clock synthesiser. This multi-function integrated controller delivers superior
3D performance, TV-quality scaled video optimized for MPEG playback, industry-leading
Mach64 2D performance, and video expansion capability suited for video conferencing,
cable TV viewing, and hardware MPEG decoding.
The availability of ATI BIOS, drivers, utilities, and application software developed for the
entire chip family is a major strength for the 3D RAGE PRO. Being register-compatible
with all other controllers in the Mach64 accelerator series means immediate compatibility
with a wide range of application drivers. Since this controller is also pin-compatible with
ATI's family of other mach64 integrated controllers, it provides to the OEM a low-cost
upgrade path to additional features and performance.
This controller uses active power management techniques to monitor activity levels within
its' self and to perform real-time power reductions such as dynamic clock control and
graphics engine shutdown. Because full-speed operation can be restored without delay,
these techniques do not impact performance. Major advances have been included in this
chip to boost performance in the area of a new bus interface, Accelerated Graphics Port

BCM Advanced Research

Table 2.5. Memory Map
SIZE TO
4GB
1MB System BIOS (Shadowed in DRAM)
96KB 896KB Expansion region (Shadowed in DRAM)
32KB 800KB Video BIOS (Shadowed in DRAM)
768KB Video Buffer (SMM space Non-Cacheable)
640KB Optional memory space gap (DOS Apps)
512KB DOS applications (No read/write protect)
DESCRIPTION
BIOS ROM
(Always cacheable)
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