32581C

Core Logic Module - X-Bus Expansion Interface - Function 5

 

 

6.4.5.1 X-Bus Expansion Support Registers

 

F5 Index 10h, Base Address Register 0 (F5BAR0) set the

trol support registers. Table 6-40shows the support regis-

base address that allows PCI access to additional I/O Con-

ters accessed through F5BAR0.

Table 6-40. F5BAR0+I/O Offset: X-Bus Expansion Registers

Bit

Description

 

 

 

 

 

Offset 00h-03h

I/O Control Register 1 (R/W)

Reset Value: 010C0007h

 

 

 

31:28

Reserved.

 

 

 

 

27

IO_ENABLE_SIO_IR (Enable Integrated SIO Infrared).

 

 

0:

Disable.

 

 

1:

Enable.

 

 

 

26:25

IO_SIOCFG_IN (Integrated SIO Input Configuration). These two bits can be used to disable the integrated SIO totally or

 

limit/control the base address.

 

 

00: Integrated SIO disable.

 

 

01: Integrated SIO configuration access disable.

 

 

10: Integrated SIO base address 02Eh/02Fh enable.

 

 

11: Integrated SIO base address 015Ch/015Dh enable.

 

 

 

24

IO_ENABLE_SIO_DRIVING_ISA_BUS (Enable Integrated SIO ISA Bus Control). Allow the integrated SIO to drive the

 

internal ISA bus.

 

 

0:

Disable.

 

 

1:

Enable. (Default)

 

 

 

 

23:21

Reserved. Set to 0.

 

 

 

20

IO_USB_SMI_PWM_EN (USB Internal SMI). Route USB-generated SMI to SMI Status Register in F1BAR0+I/O Offset

 

00h/02h[14].

 

 

0:

Disable.

 

 

1:

Enable.

 

 

 

 

19

IO_USB_SMI_EN (USB SMI Configuration). Allow USB-generated SMIs.

 

 

0:

Disable

 

 

1:

Enable.

 

 

If bits 19 and 20 are enabled, the SMI generated by the USB is reported via the Top Level SMI status register at F1BAR0+I/

 

O Offset 00h/02h[14].

 

 

If only bit 19 is enabled, the USB can generate an SMI but there is no status reporting.

 

 

 

 

18

IO_USB_PCI_EN (USB). Enables USB ports.

 

 

0:

Disable.

 

 

1:

Enable.

 

 

 

 

17:0

Reserved.

 

 

 

 

 

280

AMD Geode™ SC3200 Processor Data Book

Page 280
Image 280
AMD SC3200 manual 40. F5BAR0+I/O Offset X-Bus Expansion Registers, Bus Expansion Support Registers