SAA7785 Datasheet, PDF (31/68 Pages) NXP Semiconductors – ThunderBird Avenger PCI Audio Accelerator

Philips Semiconductors
Preliminary Specification
ThunderBird Avenger^TM PCI Audio
Accelerator
SAA7785
FIGURE 6
In each of the three SSA7785 ThunderBird Avenger™ functions PCI configuration space there is a Subsystem Vendor
ID register at an offset of 2Ch and a Subsystem ID register at an offset of 2Eh. Each register is 16 bits in length and is
write-only by the serial EEPROM and read-only from the PCI interface. The data from the EEPROM is loaded into the
registers immediately after PCI reset. If no EEPROM is detected, the default values are loaded and shown in SSA7785
ThunderBird Avenger™ and reflect the default values for the System ID and Vendor ID for that function.
TABLE 7 Subsystem Register Default Values
Function
Device Type
Offset
Register Name
Default Value
0
Audio Subsystem
2Ch
0
Audio Subsystem
2Eh
1
Joystick
2Ch
1
Joystick
2Eh
2
16650 UART
2Ch
2
16650 UART
2Eh
Subsystem Vendor ID
Subsystem ID
Subsystem Vendor ID
Subsystem ID
Subsystem Vendor ID
Subsystem ID
1004h
0304h
1004h
0305h
1004h
0306h
The EEPROM contains bits 000h through 3FFh. Only bits 000h through 05Fh are utilized to program the Subsystem ID
and Subsystem Vendor ID registers. The bit assignments between the EEPROM and the configuration registers are
shown in SSA7785 ThunderBird Avenger™.
TABLE 8 EEPROM BIT Assignments to Subsystem Registers
Function 0 - Audio Subsystem
Subsystem Vendor
ID - Offset 2Ch
Subsystem ID -
Offset 2Eh
EEPROM
Bit #
000h
001h
002h
003h
004h
005h
006h
007h
008h
009h
00Ah
00Bh
00Ch
00Dh
00Eh
Reg
Bit #
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
EEPROM
Bit #
010h
011h
012h
013h
014h
015h
016h
017h
018h
019h
01Ah
01Bh
01Ch
01Dh
01Eh
Reg
Bit #
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Function 1 - Joystick
Subsystem Vendor
ID - Offset 2Ch
Subsystem ID -
Offset 2Eh
EEPROM
Bit #
020h
021h
022h
023h
024h
025h
026h
027h
028h
029h
02Ah
02Bh
02Ch
02Dh
02Eh
Reg
Bit #
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
EEPROM
Bit #
030h
031h
032h
033h
034h
035h
036h
037h
038h
039h
03Ah
03Bh
03Ch
03Dh
03Eh
Reg
Bit #
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Function 2 - 16650 Modem UART
Subsystem Vendor
ID - Offset 2Ch
Subsystem ID -
Offset 2Eh
EEPROM
Bit #
040h
041h
042h
043h
044h
045h
046h
047h
048h
049h
04Ah
04Bh
04Ch
04Dh
04Eh
Reg
Bit #
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
EEPROM
Bit #
050h
051h
052h
053h
054h
055h
056h
057h
058h
059h
05Ah
05Bh
05Ch
05Dh
05Eh
Reg
Bit #
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
1999 Nov 12
31