Texas Instruments TMS320C6747 DSP Benutzerhandbuch
3.11 HC Head Bulk Register (HCBULKHEADED)
3.12 HC Current Bulk Register (HCBULKCURRENTED)
Registers
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The HC head bulk register (HCBULKHEADED) defines the physical address of the head endpoint
descriptor (ED) on the bulk ED list. HCBULKHEADED is shown in
descriptor (ED) on the bulk ED list. HCBULKHEADED is shown in
and described in
Figure 12. HC Head Bulk Register (HCBULKHEADED)
31
16
BHED
R/W-0
15
4
3
0
BHED
Reserved
R/W-0
R-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 12. HC Head Bulk Register (HCBULKHEADED) Field Descriptions
Bit
Field
Value
Description
31-4
BHED
0-FFF FFFFh Physical address of the head ED on the bulk ED list. This field represents bits 31-4 of the physical
address of the head ED on the bulk ED list. EDs are assumed to begin on a 16-byte aligned
address, so bits 3-0 of this pointer are assumed to be 0. For the restrictions on physical
addresses, see
address, so bits 3-0 of this pointer are assumed to be 0. For the restrictions on physical
addresses, see
.
3-0
Reserved
0
Reserved
The HC current bulk register (HCBULKCURRENTED) defines the physical address of the next endpoint
descriptor (ED) on the bulk ED list. HCBULKCURRENTED is shown in
descriptor (ED) on the bulk ED list. HCBULKCURRENTED is shown in
and described in
.
Figure 13. HC Current Bulk Register (HCBULKCURRENTED)
31
16
BCED
R/W-0
15
4
3
0
BCED
Reserved
R/W-0
R-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 13. HC Current Bulk Register (HCBULKCURRENTED) Field Descriptions
Bit
Field
Value
Description
31-4
BCED
0-FFF FFFFh Physical address of the current ED on the bulk ED list. This field represents bits 31-4 of the
physical address of the next ED on the bulk ED list. EDs are assumed to begin on a 16-byte
aligned address, so bits 3-0 of this pointer are assumed to be 0. For the restrictions on physical
addresses, see
aligned address, so bits 3-0 of this pointer are assumed to be 0. For the restrictions on physical
addresses, see
.
A value of 0 indicates that the USB host controller has reached the end of the bulk ED list without
finding any transfers to process. This register is automatically updated by the USB host controller.
finding any transfers to process. This register is automatically updated by the USB host controller.
3-0
Reserved
0
Reserved
Universal Serial Bus OHCI Host Controller
22
SPRUFM8 – September 2008