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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(jī)控制器（的USB主控制器） |
| 文件頁數(shù)： | 31/95頁 |
| 文件大?。?/td> | 423K |
| 代理商： | ΜPD9210FGC-7EA |
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CHAPTER 3 DESCRIPTION OF USB HOST CONTROLLER FUNCTIONS
31
Figure 3-5. Interrupt ED List
0
16
8
24
4
20
12
28
18
10
26
22
14
30
2
6
1
17
9
25
5
21
13
29
3
19
11
27
23
15
31
7
32 16
8
4
2
1
Interrupt
Head
Pointers
Endpoint Poll Interval (ms)
Interrupt
Endpoint
Descriptor
Placeholder
Figure 3-6 shows how the OpenHCI’s bandwidth is allocated. The HC selects the list to be serviced based on a
prioritization algorithm. Control and bulk lists take priority from the start of the frame to the point where
HcFmRemaining becomes HcPeriodicStart.
When HcFmRemaining becomes HcPeriodicStart, periodic list servicing takes priority. The priority of periodic list
servicing is higher than that of control or bulk servicing up until the point where periodic list servicing is completed or
the frame period is completed. After periodic list servicing is completed, control or bulk list servicing is resumed.
Figure 3-6. Allocation of Bandwidth
SOF
Time
NP
Periodic
NP
1.0 ms
Interrupt/isochronous list servicing begins with servicing the interrupt ED head pointer that is serviced for the
current frame. Since isochronous lists are attached after interrupt lists, interrupt lists must have a higher priority than
isochronous lists. Bulk and control list servicing resumes at the point in each list where servicing was interrupted.
When servicing reaches the end of the list, a value is loaded from the head pointer and servicing continues. The
control endpoint is given access privileges that are at least equivalent to those of the bulk endpoint, and this service
ratio is determined by ControlBulkServiceRatio in HcControl. Figure 3-7 shows an example where the control/bulk
service ratio is 4:1. When control and bulk take priority, the HC executes ED servicing of each list according to the
ControlBulkServiceRatio.
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