AMD Geode SC3200 Data Book page 284

32581C
Table 6-41. PCIUSB: USB PCI Configuration Registers (Continued)
Bit Description
Index 14h-2Bh
Index 2Ch-2Dh
Index 2Eh-2Fh
Index 30h-3Bh
Index 3Ch
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
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
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
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
Used for internal debug and test purposes only.
Index 44h
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
284
Reserved
Subsystem Vendor ID (RO)
Subsystem ID (RO)
Reserved
Interrupt Line Register (R/W)
Interrupt Pin Register (R/W)
Min. Grant Register (RO)
Max. Latency Register (RO)
ASIC Test Mode Enable Register (R/W)
ASIC Operational Mode Enable Register (R/W)
Reserved
Core Logic Module - USB Controller Registers - PCIUSB
AMD Geode™ SC3200 Processor Data Book
Reset Value: 00h
Reset Value: 0E11h
Reset Value: A0F8h
Reset Value: 00h
Reset Value: 00h
Reset Value: 01h
Reset Value: 00h
Reset Value: 50h
Reset Value: 000F0000h
Reset Value: 00h
Reset Value: 00h