
YMF724F
January 14, 1999
-10-
1-2. PCI Configuration Register
In addition to the Configuration Register defined by PCI Revision 2.1, DS-1 provides proprietary PCI
Configuration Registers in order to control legacy audio function, such as FM Synthesizer, Sound Blaster Pro,
MPU401 and Joystick.
These additional registers are configured by BIOS or the configuration software
from YAMAHA Corporation.
The following shows the overview of the PCI Configuration Register.
Offset
b[31..24]
b[23..16]
b[15..8]
b[7..0]
00-03h
Device ID
Vendor ID
04-07h
Status
Command
08-0Bh
Base Class Code
Sub Class Code
Programming IF
Revision ID
0C-0Fh
Reserved
Header Type
Latency Timer
Reserved
10-13h
PCI Audio Memory Base Address
14-2Bh
Reserved
2C-2Fh
Subsystem ID
Subsystem Vendor ID
30-33h
Reserved
34-37h
Reserved
Cap Pointer
38-3Bh
Reserved
3C-3Fh
Maximum Latency
Minimum Grant
Interrupt Pin
Interrupt Line
40-43h
Extended Legacy Audio Control
Legacy Audio Control
44-47h
Subsystem ID Write
Subsystem Vendor ID Write
48-4Bh
DS-1 Power Control
DS-1 Control
4C-4Fh
Reserved
D-DMA Slave Configuration
50-53h
Power Management Capabilities
Next Item Pointer
Capability ID
54-57h
Reserved
Power Management Control / Status
58-5Bh
Reserved
ACPI Mode
5C-FFh
Reserved
registers are hardwired to “0”.
All data written to these registers are discarded.
The values
read from these registers are all zero.
DS-1 can be accessed by using any bus width, 8-bit, 16-bit or 32-bit.