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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主機控制器（的USB主控制器） |
| 文件頁數(shù)： | 27/95頁 |
| 文件大?。?/td> | 423K |
| 代理商： | ΜPD9210FGC-7EA |
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CHAPTER 3 DESCRIPTION OF USB HOST CONTROLLER FUNCTIONS
This chapter provides an overview of the USB, the operations of the host controller, and the structure of the
interface data that is used. For details, see the
Open Host Controller Interface Specification Release 1.0
and
OpenHCI Legacy Support Interface Specification Release Version 1.01
.
3.1 Overview of USB
The USB (Universal Serial Bus) is a type of serial bus that enables transfer of data between a host computer and
various types of peripheral devices. The USB host has point-to-point connections with USB devices via a tiered star
topology, in which each star contains a device called a hub. Figure 3-1 shows a USB bus topology. The USB
enables connection of up to 127 devices via this tiered star topology. In addition, devices can be connected or
disconnected while the system is still operating.
Figure 3-1. Bus Topology
Host
RootHub
Hub 1
Hub 2
Hub 4
Hub 3
Node
Node
Node
Node
Node
Node
Node
Host (Root Tier)
Tier 1
Tier 2
Tier 3
Tier 4
USB signals are transferred point-to-point as differential signals using two signal lines. There are two signal trace
modes: full speed mode (12 Mbs) and low speed mode (1.5 Mbs). Low speed mode is used in low-cost devices
such as mouse devices that do not require much EMI protection. As shown in Figures 3-2 and 3-3, the mode is set
as full speed or low speed based on the position of the terminating resistors connected to both ends of the USB
cable. Terminating resistors are also used at each port to detect when devices are being connected or disconnected.
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