AMD Geode SC1201 User Manual

Page 288

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288

AMD Geode™ SC1200/SC1201 Processor Data Book

Core Logic Module - USB Controller Registers - PCIUSB

32579B

2

StartOfFrameEnable.

0: Ignore.

1: Disable interrupt generation due to Start of Frame.

1

WritebackDoneHeadEnable.

0: Ignore.

1: Disable interrupt generation due to Writeback Done Head.

0

SchedulingOverrunEnable.

0: Ignore.

1: Disable interrupt generation due to Scheduling Overrun.

Note:

Writing a 1 to a bit in this register clears the corresponding bit, while writing a 0 to a bit leaves the bit unchanged.

Offset 18h-1Bh

HcHCCA Register (R/W)

Reset Value = 00000000h

31:8

HCCA. Pointer to HCCA base address.

7:0

Reserved. Read/Write 0s.

Offset 1Ch-1Fh

HcPeriodCurrentED Register (R/W)

Reset Value = 00000000h

31:4

PeriodCurrentED. Pointer to the current Periodic List ED.

3:0

Reserved. Read/Write 0s.

Offset 20h-23h

HcControlHeadED Register (R/W)

Reset Value = 00000000h

31:4

ControlHeadED. Pointer to the Control List Head ED.

3:0

Reserved. Read/Write 0s.

Offset 24h-27h

HcControlCurrentED Register (R/W)

Reset Value = 00000000h

31:4

ControlCurrentED. Pointer to the current Control List ED.

3:0

Reserved. Read/Write 0s.

Offset 28h-2Bh

HcBulkHeadED Register (R/W)

Reset Value = 00000000h

31:4

BulkHeadED. Pointer to the Bulk List Head ED.

3:0

Reserved. Read/Write 0s.

Offset 2Ch-2Fh

HcBulkCurrentED Register (R/W)

Reset Value = 00000000h

31:4

BulkCurrentED. Pointer to the current Bulk List ED.

3:0

Reserved. Read/Write 0s.

Offset 30h-33h

HcDoneHead Register (R/W)

Reset Value = 00000000h

31:4

DoneHead. Pointer to the current Done List Head ED.

3:0

Reserved. Read/Write 0s.

Offset 34h-37h

HcFmInterval Register (R/W)

Reset Value = 00002EDFh

31

FrameIntervalToggle (Read Only). This bit is toggled by HCD when it loads a new value into FrameInterval.

30:16

FSLargestDataPacket (Read Only). This field specifies a value which is loaded into the Largest Data Packet Counter at
the beginning of each frame.

15:14

Reserved. Read/Write 0s.

13:0

FrameInterval. This field specifies the length of a frame as (bit times - 1). For 12,000 bit times in a frame, a value of 11,999
is stored here.

Table 6-42. USB_BAR+Memory Offset: USB Controller Registers (Continued)

Bit

Description

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