Universal Serial Bus OHCI Host Controller User's Guide

3.10 HC Current Control Register (HCCONTROLCURRENTED)
www.ti.com 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 Figure 11 and
described in Table 11 .
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 Section 2.7 .
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.
3-0 Reserved 0 Reserved
SPRUFM8 – September 2008 Universal Serial Bus OHCI Host Controller 21
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