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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  
8.2.1.31  
Register FBh: PortMap 12  
BIT NAME  
BIT  
NUMBER  
DESCRIPTION  
PortMap register for ports 1 & 2.  
7:0  
PRTR12  
When a hub is enumerated by a USB host controller, the hub is only  
permitted to report how many ports it has; the hub is not permitted to select  
a numerical range or assignment. The host controller will number the  
downstream ports of the hub starting with the number '1', up to the number  
of ports that the hub reported having.  
The host's port number is referred to as "Logical Port Number" and the  
physical port on the hub is the “Physical Port Number". When mapping mode  
is enabled (see PRTMAP_EN in Register 08h: Configuration Data Byte 3)  
the hub's downstream port numbers can be mapped to different logical port  
numbers (assigned by the host).  
Note:  
OEM must ensure that contiguous logical port numbers are used,  
starting from #1 up to the maximum number of enabled ports; this  
ensures that the hub's ports are numbered in accordance with the  
way a host will communicate with the ports.  
Table 8.3 PortMap Register for Ports 1 & 2  
Bit [7:4]  
‘0000’  
‘0001’  
‘0010’  
‘0011’  
‘0100’  
‘0101’  
‘0100’  
‘0111’  
Physical Port 2 is Disabled  
Physical Port 2 is mapped to Logical Port 1  
Physical Port 2 is mapped to Logical Port 2  
Physical Port 2 is mapped to Logical Port 3  
Physical Port 2 is mapped to Logical Port 4  
Physical Port 2 is mapped to Logical Port 5  
Physical Port 2 is mapped to Logical Port 6  
Physical Port 2 is mapped to Logical Port 7  
Reserved, will default to ‘0000’ value  
‘1000’  
to  
‘1111’  
Bit [3:0]  
‘0000’  
‘0001’  
‘0010’  
‘0011’  
‘0100’  
‘0101’  
‘0110’  
‘0111’  
Physical Port 1 is Disabled  
Physical Port 1 is mapped to Logical Port 1  
Physical Port 1 is mapped to Logical Port 2  
Physical Port 1 is mapped to Logical Port 3  
Physical Port 1 is mapped to Logical Port 4  
Physical Port 1 is mapped to Logical Port 5  
Physical Port 1 is mapped to Logical Port 6  
Physical Port 1 is mapped to Logical Port 7  
Reserved, will default to ‘0000’ value  
‘1000’  
to  
‘1111’  
Revision 1.0 (3-11-09)  
48  
SMSC USB251x  
DATASHEET  
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