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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  
Table 5.2 USB251x Pin Descriptions (continued)  
DESCRIPTION  
BUFFER  
TYPE  
SYMBOL  
DOWNSTREAM USB 2.0 INTERFACES (continued)  
LED_A_N[x:1] /  
I/O12  
Port LED Indicators  
This pin will be active low when LED support is enabled via EEPROM or  
SMBus.  
Port Swap Strapping Option  
PRTSWP[x:1]  
If this strap is enabled by package and configuration settings (see Table 8.1,  
"Hub Configuration Options"), this pin will be sampled at RESET_N negation  
to determine the electrical connection polarity of the downstream USB port  
pins (USB_DP and USB_DM).  
Also, the active state of the LED will be determined as follows:  
‘0’ = Port polarity is normal, LED is active high.  
‘1’ = Port polarity (USB_DP and USB_DM) is swapped, LED is active low.  
Enhanced Indicator Port LED for ports 4-7  
LED_B_N[7:4]  
I/O12  
I/O12  
Enhanced indicator LED for ports 4-7. This pin will be active low when LED  
support is enabled via EEPROM or SMBus.  
LED_B_N[3] /  
GANG_EN  
Enhanced Indicator Port LED for Port 3  
Ganged Power and Over-current strap option  
This signal selects between ganged or individual port power and over-current  
sensing. If this strap is enabled by package and configuration settings (see  
Table 8.1, "Hub Configuration Options"), this pin will be sampled at RESET_N  
negation to determine the mode as follows:  
‘0’ = Individual sensing and switching, LED_B_N[3] is active high.  
‘1’ = Ganged sensing and switching, LED_B_N[3] is active low.  
SMSC USB251x  
23  
Revision 1.0 (3-11-09)  
DATASHEET  
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