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ThunderBird Avenger
TM
PCI Audio SAA7785
Accelerator
Philips Semiconductors Preliminary Specification
1999 Nov 12 32
These bits correspond to Function 0, Subsystem ID (offset 2Eh) bits 2, 1, and 0, respectively. The Vendor should
choose and ID that corresponds to the peripherals present and program the EEPROM accordingly.
PCI Datapath
The PCI datapath provides the flip flops to convert the external PCI interface address, data, command and byte enables
busses to the internal PM and PS busses.
PCI Configuration Register
Since the SSA7785 ThunderBird Avenger™ is a multi-function device, there are three configuration headers. They are
defined as the audio configuration header as function 0, the joystick configuration header as function 1, and the UART
configuration header defined as function 2. Each configuration space is divided up into two groups, the registers that
stay with the PCI interface and the registers that do not. This section will describe the PCI configuration registers that
bunk with the PCI interface. These registers include the PCI standard configuration header registers and the base
address registers for various blocks in the SSA7785 ThunderBird Avenger™ chip.
To be more specific, the registers in the offset config space from 00h - 3Fh are the predefined PCI configuration header.
All three PCI configuration header registers will reside with the PCI interface. The remainder of the registers are func-
tion specific and can be found in the block section itself.
The following sections will detail each of the configuration header spaces for each of the SSA7785 ThunderBird
Avenger™ functions: audio, joystick and UART.
PCI Configuration Space 0
The following table is a summary of all the PCI configuration space registers. The registers that are block-mates with
the PCI interface (offset 00h - 44h) will be detailed following SSA7785 ThunderBird Avenger™. The remainder of the
registers will be detailed with the blocks they control.
TABLE 9 PCI Configuration Space 0 Register Map
00Fh 0 01Fh 0 02Fh 0 03Fh 0 04Fh 0 05Fh 0
Byte 3 Byte 2 Byte 1 Byte 0 Offset
Device ID Vendor ID 00h
Status Command 04h
Class Code Revision ID 08h
BIST Header Type Master Latency Timer Cache Line Size 0Ch
SONGBASE 10h
SBBASE 14h
MDBASE 18h
ALBASE 1Ch
Reserved 20-2Bh
Function 0 - Audio Subsystem Function 1 - Joystick Function 2 - 16650 Modem UART
Subsystem Vendor
ID - Offset 2Ch
Subsystem ID -
Offset 2Eh
Subsystem Vendor
ID - Offset 2Ch
Subsystem ID -
Offset 2Eh
Subsystem Vendor
ID - Offset 2Ch
Subsystem ID -
Offset 2Eh
EEPROM
Bit #
Reg
Bit #
EEPROM
Bit #
Reg
Bit #
EEPROM
Bit #
Reg
Bit #
EEPROM
Bit #
Reg
Bit #
EEPROM
Bit #
Reg
Bit #
EEPROM
Bit #
Reg
Bit #