SAA7780 データシートの表示（PDF） - Philips Electronics
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SAA7780 Datasheet PDF : 70 Pages
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Philips Semiconductors
ThunderBird Q3D PCI Audio
Accelerator
FIGURE 5
CFGDAT
ThunderBird
CFGCLK
Product Specification
SAA7780
+5V
SDA WP
EEPROM
SCL
In each of the three SAA7780 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 as shown and reflect the default values for the
System ID and Vendor ID for that function.
Subsystem Register Default Values
Function
Device Type
Offset
Register Name
Default Value
0
Audio Subsystem
2Ch
Subsystem Vendor ID
0
Audio Subsystem
2Eh
Subsystem ID
1
Joystick
2Ch
Subsystem Vendor ID
1
Joystick
2Eh
Subsystem ID
2
16650 UART
2Ch
Subsystem Vendor ID
2
16650 UART
2Eh
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 below.
EEPROM BIT Assignments to Subsystem Registers
Function 0 - Audio Subsystem
Subsystem
Vendor ID - Offset
2Ch
Subsystem ID -
Offset 2Eh
EEPROM
Bit #
000h
001h
002h
Reg
Bit #
15
14
13
EEPROM
Bit #
010h
011h
012h
Reg
Bit #
15
14
13
Function 1 - Joystick
Subsystem
Vendor ID - Offset
2Ch
Subsystem ID -
Offset 2Eh
EEPROM
Bit #
020h
021h
022h
Reg
Bit #
15
14
13
EEPROM
Bit #
030h
031h
032h
Reg
Bit #
15
14
13
Function 2 - 16650 Modem UART
Subsystem
Vendor ID - Offset
2Ch
Subsystem ID -
Offset 2Eh
EEPROM
Bit #
040h
041h
042h
Reg
Bit #
15
14
13
EEPROM
Bit #
050h
051h
052h
Reg
Bit #
15
14
13
1999 Sep 30
30
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