Registers
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SPRUH91D–March 2013–Revised September 2016
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Universal Serial Bus OHCI Host Controller
30.3.7 HC HCAA Address Register (HCHCCA)
The HC HCAA address register (HCHCCA) defines the physical address of the beginning of the HCCA.
HCHCCA is shown in Figure 30-8 and described in Table 30-8.
Figure 30-8. HC HCAA Address Register (HCHCCA)
31 16
HCCA
R/W-0
15 8 7 0
HCCA Reserved
R/W-0 R-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 30-8. HC HCAA Address Register (HCHCCA) Field Descriptions
Bit Field Value Description
31-8 HCCA 0-FF FFFFh Physical address of the beginning of the HCCA.
7-0 Reserved 0 Reserved
30.3.8 HC Current Periodic Register (HCPERIODCURRENTED)
The HC current periodic register (HCPERIODCURRENTED) defines the physical address of the next
endpoint descriptor (ED) on the periodic ED list. HCPERIODCURRENTED is shown in Figure 30-9 and
described in Table 30-9.
Figure 30-9. HC Current Periodic Register (HCPERIODCURRENTED)
31 16
PCED
R-0
15 4 3 0
PCED Reserved
R-0 R-0
LEGEND: R = Read only; -n = value after reset
Table 30-9. HC Current Periodic Register (HCPERIODCURRENTED) Field Descriptions
Bit Field Value Description
31-4 PCED 0-FFF FFFFh Physical address of the current ED on the periodic ED list. This field represents bits 31-4 of the
physical address of the next ED on the periodic 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 30.2.7.
3-0 Reserved 0 Reserved
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