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741
USB Controller Module
Register bit assignment
HcControlHeadED register
Address: 9010 1020
The HcHeadControlED register contains the physical address of the first endpoint
descriptor of the control list.
Bits Access Mnemonic Reset Description
D31:04 R PCED 0h PeriodCurrentED
Used by the host controller to point to the head of one of
the periodic lists that will be processed in the current
frame. The content of this register is updated by the host
controller after a periodic endpoint has been processed.
The host controller driver can read the content to
determine which endpoint currently is being processed at
the time of the reading.
D03:00 N/A Not used 0 Must be written to 0.
Table 430: HcPeriodCurrentED
13121110987654321015 14
31 29 28 27 26 25 24 23 22 21 20 19 18 17 1630
CHED
Not usedCHED