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ThunderBird Avenger
TM
PCI Audio SAA7785
Accelerator
Philips Semiconductors Preliminary Specification
1999 Nov 12 40
SSA7785 ThunderBird Avenger™ CFG Space 0 Legacy Base Address Registers
The SSA7785 ThunderBird Avenger™ contains three legacy I/O base registers in configuration space 0. These legacy
devices are the Sound Blaster register, the AdLib registers and the MIDI interface registers. They are described in detail
in the next three tables.
TABLE 21 Sound Blaster Base Address- SBBASE (RW/RO)
D23 D22 D21 D20 D19 D18 D17 D16
SONGBASE[23:16]
POR Value
00000000
D15 D14 D13 D12 D11 D10 D9 D8
SONGBASE[15:8]
POR Value
00000000
D7 D6 D5 D4 D3 D2 D1 D0
SONG
BASE[7]
RRRRRRIO
POR Value
00000001
Bit Name R/W Function
31:7 SONGBASE RW Thunderbird non-legacy device base address register. This register supplies
the I/O base address for the non-legacy I/O devices within the SSA7785
ThunderBird Avenger™ chip.
6:1 R RO Reserved. These bits are reserved a must always return a zero for plug and
play.
0 IO RO I/O flag. This read only bit indicates that this is an I/O range.
PCI CFG 0 D31 D30 D29 D28 D27 D26 D25 D24
Offset 14h
SBBASE[31:24]
POR Value
00000000
D23 D22 D21 D20 D19 D18 D17 D16
SBBASE[23:16]
POR Value
00000000