RM0082
HS_USB2.0 host
Doc ID 018672 Rev 1
449/844
22.6.33 HcPeriodCurrentED
register
The HcPeriodCurrentED register contains the physical address of the current Isochronous
or Interrupt Endpoint Descriptor.
Table 373.
HcPeriodCurrentED register bit assignments
22.6.34 HcControlHeadED
register
The HcControlHeadED register contains the physical address of the first Endpoint
Descriptor of the Control list.
Table 374.
HcControlHeadED register bit assignments
22.6.35 HcControlCurrentED
register
The HcControlCurrentED register contains the physical address of the current Endpoint
Descriptor of the Control list.
Table 372.
HcHCCA register bit assignments
Bits
Name
Reset
Read/Write
Description
HCD
HC
[31:08]
HCCA
0h
R/W
R
This is the base address of the Host Controller
Communication Area.
[07:00]
Reserved
Bits
Name
Reset
Read/Write
Description
HCD
HC
[31:04]
PCED
0h
R
R/W
PeriodCurrentED
This is used by HC to point to the head of one of the
Periodic lists which will be processed in the current
Frame. The content of this register is updated by HC after
a periodic ED has been processed. HCD may read the
content in determining which ED is currently being
processed at the time of reading.
[03:00]
Reserved
Bits
Name
Reset
Read/Write
Descritpion
HCD
HC
[31:04]
CHED
0h
R/W
R
ControlHeadED
HC traverses the Control list starting with the
HcControlHeadED pointer. The content is loaded from
HCCA during the initialization of HC.
[03:00]
Reserved