YMF744B
February 3, 1999
-10-
1-2. PCI Configuration Register
In addition to the Configuration Register defined by PCI Revision 2.2, DS-1S provides proprietary PCI
Configuration Registers in order to control legacy audio function, such as FM Synthesize r, Sound Blaster Pro,
MPU401 and Joystick. These additional registers are configured by BIOS or the configuration software
from YAMAHA Corporation.
The following shows the overvie w of the PCI Configuration Re gister.
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 Program ming I F Revision I D
0C-0Fh Reserved Header Type Latency Timer Reserved
10-13h PCI Audi o Memory Base Address
14-17h Legacy Audio I /O Base Address (Dummy for SB , FM, MPU, D-DMA)
18-1Bh Legacy Audio I/O B ase Address (Dum my for Joyst i ck)
1C-2Bh Reserved
2C-2Fh Subsystem I D Subsystem V endor ID
30-33h Reserved
34-37h Reserved Cap Pointer
38-3Bh Reserved
3C-3Fh Maximum Lat ency Minimum Grant Interrupt P i n Interrupt Li ne
40-43h Extended Legacy Audio Cont rol Legacy Audio Cont rol
44-47h Subsys tem I D Write Subsys tem V endor ID Write
48-4Bh DS-1S Power Control 1 DS-1S Control
4C-4Fh DS-1S Power Control 2 D-DMA Slave Configuration
50-53h Power Management Capabilit ies Next Item P oint er Capability ID
54-57h Reserved Power Management Control / Status
58-5Bh DS-1S Secondary AC’97 P ower Control ACPI Mode
5C-5Fh Reserved
60-63h Sound Blaster Bas e Address FM Synthesizer B ase Address
64-67h Joyst i c k Base Address MPU401 Base Address
68-FFh Reserved
Reserved registers are hardwired to “0”. All data written to these registers are discarded. The values
read from these registers are all zero.
DS-1S can be accessed by using any bus width, 8-bit, 16-bit or 32-bit.