Texas Instruments TMS320C6747 DSP manual HC Head Bulk Register HCBULKHEADED

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3.11 HC Head Bulk Register (HCBULKHEADED)

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 Figure 12 and described in Table 12.

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 Section 2.7.
3-0	Reserved	0	Reserved

3.12 HC Current Bulk Register (HCBULKCURRENTED)

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 Figure 13 and described in Table 13.

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 Section 2.7.
			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.
3-0	Reserved	0	Reserved
22	Universal Serial Bus OHCI Host Controller			SPRUFM8–September 2008

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