參數(shù)資料
型號(hào): 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(jī)控制器(的USB主控制器)
文件頁(yè)數(shù): 33/95頁(yè)
文件大小: 423K
代理商: ΜPD9210FGC-7EA
CHAPTER 3 DESCRIPTION OF USB HOST CONTROLLER FUNCTIONS
33
3.3 Endpoint Descriptor
An ED is always allocated in 16-byte units to system memory. When the ED list is referenced, if it contains a TD
that is linked to an ED, the HC executes the transfer specified by that TD. If the HCD must change the head pointer
(HeadP) value, list servicing for all EDs that have the same transfer type as the ED to be deleted must be rendered
invalid so as to prevent the HC from accessing the EDs. Therefore, the HCD sets a Skip bit.
3.3.1 Endpoint descriptor format
Figure 3-8. Endpoint Descriptor Format
C H
0
3
1
2
6
0
0
Dword 0
Dword 1
Dword 2
Dword 3
1
6
1
5
F
1
4
K
1
3
S
1
2
1
1
1
0
0
7
0
6
0
5
0
4
0
3
FA
0
2
0
1
EN
MPS
D
TD Queue Tail Pointer (TailP)
TD Queue Head Pointer (HeadP)
Next Endpoint Descriptor (NextED)
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