AMD SC2200 Bit Description Index 10h-13h, Reset Value 0E11h, Reset Value A0F8h, Index 30h-3Bh

		32580B	Core Logic Module - USB Controller Registers - PCIUSB
		Table 6-41. PCIUSB: USB PCI Configuration Registers (Continued)
Bit		Description
Index	10h-13h		Base Address Register- USB_BAR0 (R/W)	Reset Value: 00000000h
31:12		Base Address. POST writes the value of the memory base address to this register.
11:4		Always 0. Indicates that a 4 KB address range is requested.
3		Always 0. Indicates that there is no support for prefetchable memory.
2:1		Always 0. Indicates that the base register is 32-bits wide and can be placed anywhere in 32-bit memory space.
0		Always 0. Indicates that the operational registers are mapped into memory space.
Index	14h-2Bh		Reserved	Reset Value: 00h
Index	2Ch-2Dh		Subsystem Vendor ID (RO)	Reset Value: 0E11h
Index	2Eh-2Fh		Subsystem ID (RO)	Reset Value: A0F8h
Index	30h-3Bh		Reserved	Reset Value: 00h
Index 3Ch			Interrupt Line Register (R/W)	Reset Value: 00h
This register identifies the system interrupt controllers to which the device’s interrupt pin is connected. The value of this register is used
by device drivers and has no direct meaning to USB.
Index 3Dh			Interrupt Pin Register (R/W)	Reset Value: 01h
This register selects which interrupt pin the device uses. USB uses INTA# after reset. INTB#, INTC# or INTD# can be selected by writ-
ing 2, 3 or 4, respectively.
Index 3Eh			Min. Grant Register (RO)	Reset Value: 00h
This register specifies how long a burst is needed by the USB, assuming a clock rate of 33 MHz. The value in this register specifies a
period of time in units of 1/4 microsecond.
Index 3Fh			Max. Latency Register (RO)	Reset Value: 50h
This register specifies how often (in units of 1/4 microsecond) the USB needs access to the PCI bus assuming a clock rate of 33 MHz.
Index	40h-43h		ASIC Test Mode Enable Register (R/W)	Reset Value: 000F0000h
Used for internal debug and test purposes only.
Index	44h		ASIC Operational Mode Enable Register (R/W)	Reset Value: 00h
7:1		Write Only. Read as 0s.
0		Data Buffer Region 16
		0: The size of the region for the data buffer is 32 bytes.
		1: The size of the region for the data buffer is 16 bytes.
Index	45h-FFh		Reserved	Reset Value: 00h

294 AMD Geode™ SC2200 Processor Data Book