82371AB Datasheet, PDF (218/284 Pages) Intel Corporation – PCI-TO-ISA / IDE XCELERATOR PIIX4

82371AB (PIIX4)
E
11.3.5.5.
Device 4: Audio
Device 4 monitors an audio subsystem and GPI13. The available address ranges encompass the
following types of audio devices, 8/16-bit Sound Blaster, standard Game Port, ADLIB music
synthesizer, Microsoft Sound System, and MIDI. The actual address ranges selectable for each type
is shown below.
Device 4 System Events:
— PCI accesses to any of the enabled IO addresses (see below). This can cause idle,
burst, or global standby timer reloads, IO trap SMI#, or forwarding of the cycle from PCI
to ISA.
— DACKx# assertion (x=0,1,3,5,6,7) if enabled (see below). This can cause only idle,
burst, and global standby timer reloads.
— Assertion of GPI13. The polarity of active signal (high or low) is selectable. This can
cause idle, burst, or global standby timer reloads.
Device 4 Address Ranges:
Sound Blaster 8/16:
Game Port:
ADLIB Synthesizer:
Microsoft Sound System:
MIDI:
220–22Fh, 230–233h or
[SB_EN]
240–24Fh, 250–253h or
[SB_SEL]
260–26Fh, 270–273h or
280–28Fh, 290–293h
200–207h
[GAME_EN]
388–38Bh
[SB_EN]
530–537h or
[MSS_EN]
604–60Bh or
[MSS_SEL]
E80–E87h or
F40–F47h
300–303h or
[MIDI_EN]
310–313h or
[MIDI_SEL]
320–323h or
330–333h
Device 4 Idle Timer:
Resolution: 1 second
Count: 5 bit
[IDL_CNTB]
GPI Enable:
[GPI_EN_DEV4]
GPI Polarity Select:
[GPI_POL_DEV4]
DACKx# Enables:
[DACKx_EN_DEV4] where x=0,1,3,5,6,7
Device 4 ISA Forwarding Enable:
[EIO_EN_DEV4]
Device 4 Idle Timer Reload:
[IDL_EN_DEV4]
Global Standby Timer Reload:
[GRLD_EN_DEV4]
Burst Timer Reload (Fast Burst Only): [BRLD_EN_DEV4]
Idle Timer Expiration SMI#:
[IDL_EN_DEV4] [IDL_STS_DEV4]
Trap SMI#:
[TRP_EN_DEV4] [TRP_STS_DEV4]
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