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USB2512B-AEZG 参数 Datasheet PDF下载

USB2512B-AEZG图片预览
型号: USB2512B-AEZG
PDF下载: 下载PDF文件 查看货源
内容描述: USB 2.0高速集线器控制器 [USB 2.0 Hi-Speed Hub Controller]
分类和应用: 外围集成电路控制器PC时钟
文件页数/大小: 72 页 / 1689 K
品牌: SMSC [ SMSC CORPORATION ]
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USB 2.0 Hi-Speed Hub Controller  
Datasheet  
Chapter 8 Configuration Options  
8.1  
Hub  
SMSC’s USB 2.0 hub is fully specification compliant to the Universal Serial Bus specification, version  
2.0, April 27, 2000 (12/7/2000 and 5/28/2002 Errata). Please reference Chapter 10 (Hub specification)  
for general details regarding hub operation and functionality.  
The hub provides 1 Transaction Translator (TT) that is shared by both downstream ports (defined as  
Single-TT configuration), The TT contains 4 non-periodic buffers.  
8.1.1  
Hub Configuration Options  
The SMSC hub supports a large number of features (some are mutually exclusive), and must be  
configured in order to correctly function when attached to a USB host controller. There are three  
principal ways to configure the hub: SMBus, EEPROM, or by internal default settings (with or without  
configuration option over-rides). In all cases, the configuration method will be determined by the  
CFG_SEL[2], CFG_SEL[1] and CFG_SEL[0] pins immediately after RESET_N negation. Please refer  
to Table 8.1, "Hub Configuration Options" for more information.  
8.1.2  
SMBus or EEPROM Interface  
Table 8.1 Hub Configuration Options  
CFG_SEL[2]  
CFG_SEL[1]  
CFG_SEL[0]  
DESCRIPTION  
0
0
0
Internal Default Configuration without any over-rides  
„
„
„
„
„
Strap options enabled  
Self-powered operation enabled  
LED mode = Speed (when available on package)  
Individual power switching  
Individual over-current sensing  
0
0
0
1
1
0
Configured as an SMBus slave for external download of  
user-defined descriptors  
„
Strap options disabled  
„
All settings are controlled by registers as set by the user  
Internal Default Configuration  
„
„
„
„
„
Strap options enabled  
Bus-powered operation  
LED mode = USB (when available on package)  
Individual power switching  
Individual over-current sensing  
0
1
1
2-Wire I2C EEPROMS are supported  
„
Strap options disabled  
„
All settings are controlled by registers as set by the user  
SMSC USB251x  
33  
Revision 1.0 (3-11-09)  
DATASHEET  
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