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

 

 

2

Parallel/Serial Idle Timer Enable. Turn on Parallel/Serial Port Idle Timer Count Register (F0 Index 9Ch) and generate an

 

SMI when the timer expires.

 

0:

Disable.

 

1:

Enable.

 

If an access occurs in the address ranges listed below, the timer is reloaded with the programmed count.

 

 

— LPT1: I/O Port 3BCh-3BEh.

 

 

LPT2: I/O Port 378h-37Fh.

 

 

COM1: I/O Port 3F8h-3FFh (if F0 Index 93h[1:0] = 10 this range is excluded).

 

 

COM2: I/O Port 2F8h-2FFh (if F0 Index 93h[1:0] = 11 this range is excluded).

 

 

— COM3: I/O Port 3E8h-3EFh.

 

 

— COM4: I/O Port 2E8h-2EFh.

 

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

 

Second level SMI status is reported at F0 Index 85h/F5h[2].

 

 

1

Floppy Disk Idle Timer Enable. Turn on Floppy Disk Idle Timer Count Register (F0 Index 9Ah) and generate an SMI when

 

the timer expires.

 

0:

Disable.

 

1:

Enable.

 

If an access occurs in the address ranges (listed below, the timer is reloaded with the programmed count.

 

 

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 85h/F5h[1].

 

 

0

Primary Hard Disk Idle Timer Enable. Turn on Primary Hard Disk Idle Timer Count Register (F0 Index 98h) 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[5], 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 85h/F5h[0].

 

 

 

 

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AMD Geode™ SC1200/SC1201 Processor Data Book

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