Texas Instruments TMS320C6747 DSP Benutzerhandbuch
3.7
HC HCAA Address Register (HCHCCA)
3.8
HC Current Periodic Register (HCPERIODCURRENTED)
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Registers
The HC HCAA address register (HCHCCA) defines the physical address of the beginning of the HCCA.
HCHCCA is shown in
HCHCCA is shown in
and described in
Figure 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 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
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
endpoint descriptor (ED) on the periodic ED list. HCPERIODCURRENTED is shown in
and
described in
.
Figure 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 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
aligned 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
SPRUFM8 – September 2008
Universal Serial Bus OHCI Host Controller
19