SC2200 datasheet(286/433 Pages) NSC

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286

Revision 3.0

Core Logic Module (Continued)

5.4.5.1

X-Bus Expansion Support Registers

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

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

trol support registers. Table 5-40 shows the support regis-

ters accessed through F5BAR0.

Table 5-40. 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.

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.

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.

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.

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.

IO_USB_PCI_EN (USB). Enables USB ports.

0: Disable.

1: Enable.

17:0

Reserved.

Offset 04h-07h

I/O Control Register 2 (R/W)

Reset Value: 00000002h

31:2

Reserved. Write as read.

Video Processor Access Enable. Allows access to video processor using F4BAR0.

0: Disable.

1: Enable. (Default)

Note:

This bit is readable after the register (F5BAR0+Offset 04h) has been written once.

IO_STRAP_IDSEL_SELECT (IDSEL Strap Override).

0: IDSEL: AD28 for Chipset Register Space (F0-F5), AD29 for USB Register Space (PCIUSB).

1: IDSEL: AD26 for Chipset Register Space (F0-F5), AD27 for USB Register Space (PCIUSB).

SC2200 Datasheet(PDF) 286 Page - National Semiconductor (TI)

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