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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  
BIT  
NUMBER  
BIT NAME  
DESCRIPTION  
2:1  
CURRENT_SNS  
Over-Current Sense: Selects current sensing on a port-by-port basis, all  
ports ganged, or none (only for bus-powered hubs). The ability to support  
current sensing on a port or ganged basis is hardware implementation  
dependent.  
‘00’ = Ganged sensing (all ports together)  
‘01’ = Individual (port-by-port)  
‘1x’ = Over-current sensing not supported (must only be used with bus-  
powered configurations!)  
0
PORT_PWR  
Port Power Switching: Enables power switching on all ports simultaneously  
(ganged), or port power is individually switched on and off on a port- by-port  
basis (individual). The ability to support power enabling on a port or ganged  
basis is hardware implementation dependent.  
‘0’ = Ganged switching (all ports together)  
‘1’ = Individual port-by-port switching  
8.2.1.8  
Register 07h: Configuration Data Byte 2  
BIT  
NUMBER  
BIT NAME  
DESCRIPTION  
7
DYNAMIC  
Dynamic Power Enable: Controls the ability of the hub to automatically  
change from self-powered operation to bus-powered operation if the local  
power source is removed or is unavailable (and from bus-powered to self-  
powered if the local power source is restored).  
When dynamic power switching is enabled, the hub detects the availability  
of a local power source by monitoring the external LOCAL_PWR pin. If the  
hub detects a change in power source availability, the hub immediately  
disconnects and removes power from all downstream devices and  
disconnects the upstream port. The hub will then re-attach to the upstream  
port as either a bus-powered hub (if local-power is unavailable) or a self-  
powered hub (if local power is available).  
‘0’ = No dynamic auto-switching  
‘1’ = Dynamic auto-switching capable  
6
Reserved  
Reserved  
5:4  
OC_TIMER  
OverCurrent Timer: Over-current Timer delay.  
‘00’ = 0.1 ms  
‘01’ = 4.0 ms  
‘10’ = 8.0 ms  
‘11’ = 16.0 ms  
3
COMPOUND  
Compound Device: Allows OEM to indicate that the hub is part of a  
compound (see the USB specification for definition) device. The applicable  
port(s) must also be defined as having a "Non-Removable Device".  
Note:  
When configured via strapping options, declaring a port as non-  
removable automatically causes the hub controller to report that it  
is part of a compound device.  
‘0’ = No  
‘1’ = Yes, The hub is part of a compound device  
2:0  
Reserved  
Reserved  
SMSC USB251x  
39  
Revision 1.0 (3-11-09)  
DATASHEET  
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