AMD SC1200, SC1201 manual Floppy Disk Access Trap, Primary Hard Disk Access Trap, 206

32579B Core Logic Module - Bridge, GPIO, and LPC Registers - Function 0

Table 6-29. F0: PCI Header/Bridge Configuration Registers for GPIO and LPC Support (Continued)

Bit Description

1Floppy Disk Access Trap.

0:Disable.

1:Enable.

If this bit is enabled and an access occurs in the address ranges listed below, an SMI is generated.

—Primary floppy disk: I/O Port 3F2h-3F5h, 3F7h.

—Secondary floppy disk: I/O Port 372h-375h, 377h.

Top level SMI status is reported at F1BAR0+I/O Offset 00h/02h[0].

Second level SMI status is reported at F0 Index 86h/F6h[1].

0Primary Hard Disk Access Trap.

0:Disable.

1:Enable.

If this bit is enabled and an access occurs in the address ranges selected in F0 Index 93h[5], an SMI is generated.

Top level SMI status is reported at F1BAR0+I/O Offset 00h/02h[0].

Second level SMI status is reported at F0 Index 86h/F6h[0].

Index 83h Power Management Enable Register 4 (R/W) Reset Value: 00h

7Secondary Hard Disk Idle Timer Enable. Turn on Secondary Hard Disk Idle Timer Count Register (F0 Index ACh) and generate an SMI when the timer expires.

0:Disable.

1:Enable.

If an access occurs in the address ranges selected in F0 Index 93h[4], the timer is reloaded with the programmed count.

Top level SMI status is reported at F1BAR0+I/O Offset 00h/02h[0].

Second level SMI status is reported at F0 Index 86h/F6h[4].

6Secondary Hard Disk Access Trap. If this bit is enabled and an access occurs in the address ranges selected in F0 Index 93h[4], an SMI is generated.

0:Disable.

1:Enable.

Top level SMI status is reported at F1BAR0+I/O Offset 00h/02h[0].

Second level SMI status is reported at F0 Index 86h/F6h[5].

5ACPI Timer SMI. Allow SMI generation for MSB toggles on the ACPI Timer (F1BAR0+I/O Offset 1Ch or F1BAR1+I/O Offset 1Ch).

0:Disable.

1:Enable.

Top level SMI status is reported at F1BAR0+I/O Offset 00h/02h[0].

Second level SMI status is reported at F0 Index 87h/F7h[0].

4THRM# SMI. Allow SMI generation on assertion of THRM#.

0:Disable.

1:Enable.

Top level SMI status is reported at F1BAR0+I/O Offset 00h/02h[0].

Second level SMI status is reported at F0 Index 87h/F7h[6].

3VGA Timer Enable. Turn on VGA Timer Count Register (F0 Index 8Eh) and generate an SMI when the timer reaches 0.

0:Disable.

1:Enable.

If an access occurs in the programmed address range, the timer is reloaded with the programmed count. F0 Index 8Bh[6] selects the timebase for the VGA Timer.

SMI status is reported at F1BAR0+I/O Offset 00h/02h[6] (top level only).

206 AMD Geode™ SC1200/SC1201 Processor Data Book