參數(shù)資料
型號: μPD9210FGC-7EA
廠商: NEC Corp.
英文描述: USB Host Controller(USB主控制器)
中文描述: USB主機控制器(的USB主控制器)
文件頁數(shù): 41/95頁
文件大?。?/td> 423K
代理商: ΜPD9210FGC-7EA
CHAPTER 3 DESCRIPTION OF USB HOST CONTROLLER FUNCTIONS
41
3.7 List Service Flow
Figure 3-13 shows a list service flowchart. After the HC determines which list to service, list servicing is executed
via this list service flow pattern. Since lists are periodically rendered invalid by the HCD due to ED switching (or other
reasons), the HC must first check whether or not the target list is valid by checking each list enable bit in HcControl
when servicing the list.
Figure 3-13. List Service Flowchart
Read
HEAD pointer
Service Endpoint
Descriptor
Set
Hc_CurrentED =
Rc_HeadED
Set
_Filled = 0
BULK List
Periodic List
CONTROL List
NextED = 0
HEAD pointer
= 0
ISOCHRONOUS
ED
Control/Bulk
Ratio Satisfied
ISOCHRONOUS
ED
Hc_CurrentED
= 0
_Filled = 1
(Bulk or Control)
List
Enabled
ISO List
Enabled
Hc_CurrentED
= 0
ISO List
Enabled
FINISHED
FINISHED
FINISHED
SERVICE
LIST
FINISHED
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
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