Programming; E.4 Programming; E.4.1 Configuration; E.4.2 Control - Compaq Deskpro EP 6233 Technical Reference Manual

E.4

PROGRAMMING

Programming consists of configuration (using PCI protocol over the AGP bus) and
software/firmware control of the operation registers.

E.4.1 CONFIGURATION

The ATI RAGE IIC graphics card works off the AGP bus and is configured through the
controller's configuration space registers (listed in Table E-3) using PCI protocol. These registers
are configured by BIOS during POST to the default configuration.
Table E–3. ATI RAGE IIC PCI Configuration Space Registers
PCI Config.
Address Function
00h Vender ID/Device ID
04h PCI Command
08h Status
10h Display Memory Base Address
For a discussion of accessing PCI configuration space registers refer to chapter 4. For a detailed
description of registers refer to applicable ATI Technologies Inc. documentation.

E.4.2 CONTROL

Table E-4 lists the standard VGA control registers of the ATI RAGE IIC controller. These
registers can be directly accessed by software written for standard VGA modes.
Table E–4. Standard VGA Mode I/O Mapping
I/O
Address
3B5.00..26h [1]
3BAh
3C1.00..14h [1]
3C2h
3C5h.00..04h [1]
--
NOTE:
[1] Index at base minus 1 (i.e., if base is 3B5h, index is at 3B4h).
Extended mode registers (display and configuration, GUI, multimedia, and PLL registers) may be
I/O or memory-mapped and are controlled through the supplied graphics driver. The graphics
driver is adaptable to all current ATI RAGE controllers.
Table E-3.
ATI RAGE IIC PCI Configuration Space Registers
Table E-4.
Standard VGA Mode I/O Mapping
Function
CRT Controller (mono)
VSYNC Control, Display Sts.
Attribute Controller
Misc. Control / Status
Sequencer
--
Original - March 1998
Technical Reference Guide
PCI Config.
Address Function
14h Relocateable I/O Base Address
30h Expansion ROM Base Address
3Ch Interrupt Line / Interrupt Pin
-- --
I/O
Address Function
3C6h..3C9h RAMDAC
3CAh Read VSYNC Status
3CCh Misc. Control, Read
3CF.00..08h Graphics Controller
3D5.00..26h [1] CRT Controller (color)
3DAh VSYNC Control, Display Status (color)
Compaq Personal Computers
E-5