Texas Instruments TMS320C6747 DSP Benutzerhandbuch
3.10 HC Current Control Register (HCCONTROLCURRENTED)
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Registers
The HC current control register (HCCONTROLCURRENTED) defines the physical address of the next
endpoint descriptor (ED) on the control ED list. HCCONTROLCURRENTED is shown in
endpoint descriptor (ED) on the control ED list. HCCONTROLCURRENTED is shown in
and
described in
.
Figure 11. HC Current Control Register (HCCONTROLCURRENTED)
31
16
CCED
R/W-0
15
4
3
0
CCED
Reserved
R/W-0
R-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 11. HC Current Control Register (HCCONTROLCURRENTED) Field Descriptions
Bit
Field
Value
Description
31-4
CCED
0-FFF FFFFh Physical address of the current ED on the control ED list. This field represents bits 31-4 of the
physical address of the next ED on the control 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 control ED list
without finding any transfers to process. This register is automatically updated by the USB host
controller.
without finding any transfers to process. This register is automatically updated by the USB host
controller.
3-0
Reserved
0
Reserved
SPRUFM8 – September 2008
Universal Serial Bus OHCI Host Controller
21