AMD SC2200 manual 278

32580B Core Logic Module - Audio Registers - Function 3

Table 6-38. F3BAR0+Memory Offset: Audio Configuration Registers (Continued)

Bit Description

5Low MPU I/O Trap. If this bit is enabled and an access occurs at I/O Port 300h-301h, an SMI is generated.

0:Disable.

1:Enable.

Top level SMI status is reported at F1BAR0+I/O Offset 00h/02h[1].

Second level SMI status is reported at F3BAR0+Memory Offset 10h/12h[0].

Third level SMI status is reported at F3BAR0+Memory Offset 14h[11].

4Fast Path Read Enable/SMI Disable. When asserted, read Fast Path (an SMI is not generated on reads from specified addresses).

0:Disable.

1:Enable.

In Fast Path Read the Core Logic module responds to reads of addresses: 388h-38Bh; 2x0h, 2x1, 2x2h, 2x3, 2x8 and 2x9h.

If neither sound card nor FM I/O mapping is enabled, then status read trapping is not possible.

3FM I/O Trap. If this bit is enabled and an access occurs at I/O Port 388h-38Bh, an SMI is generated.

0:Disable.

1:Enable.

Top level SMI status is reported at F1BAR0+I/O Offset 00h/02h[1].

Second level SMI status is reported at F3BAR0+Memory Offset 10h/12h[0].

2Sound Card I/O Trap. If this bit is enabled and an access occurs in the address ranges selected by bits [1:0], an SMI is generated.

0:Disable.

1:Enable.

Top level SMI status is reported at F1BAR0+I/O Offset 00h/02h[1].

Second level SMI status is reported at F3BAR0+Memory Offset 10h/12h[0].

Third level SMI status is reported at F3BAR0+Memory Offset 14h[10].

1:0	Sound Card Address Range Select. These bits select the address range for the sound card I/O trap.
	00: I/O Port 220h-22Fh	10: I/O Port 260h-26Fh
	01: I/O Port 240h-24Fh	11: I/O Port 280h-28Fh
Offset 1Ah-1Bh		Internal IRQ Enable Register (R/W)	Reset Value: 0000h

15IRQ15 Internal. Configures IRQ15 for internal (software) or external (hardware) use.

0:External.

1:Internal.

14IRQ14 Internal. Configures IRQ14 for internal (software) or external (hardware) use.

0:External.

1:Internal.

13 Reserved. Must be set to 0.

12IRQ12 Internal. Configures IRQ12 for internal (software) or external (hardware) use.

0:External.

1:Internal.

11IRQ11 Internal. Configures IRQ11 for internal (software) or external (hardware) use.

0:External.

1:Internal.

10IRQ10 Internal. Configures IRQ10 for internal (software) or external (hardware) use.

0:External.

1:Internal.

9IRQ9 Internal. Configures IRQ9 for internal (software) or external (hardware) use.

0:External.

1:Internal.

8	Reserved. Must be set to 0.
278	AMD Geode™ SC2200 Processor Data Book