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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  
8.2.1.35  
Register FFh: Status/Command  
BIT NAME  
BIT  
NUMBER  
DESCRIPTION  
7:3  
2
Reserved  
Reserved  
INTF_PW_DN  
SMBus Interface Power Down  
‘0’ = Interface is active  
‘1’ = Interface power down after ACK has completed  
1
0
RESET  
Reset the SMBus Interface and internal memory back to RESET_N  
assertion default settings.  
‘0’ = Normal Run/Idle State  
‘1’ = Force a reset of registers to their default state  
USB_ATTACH  
USB Attach (and write protect)  
‘0’ = SMBus slave interface is active  
‘1’ = The hub will signal a USB attach event to an upstream device, and the  
internal memory (address range 00h-FEh) is “write-protected” to prevent  
unintentional data corruption.  
2
8.2.2  
I C EEPROM  
The I2C EEPROM interface implements a subset of the I2C Master specification (Please refer to the  
Philips Semiconductor Standard I2C-Bus specification for details on I2C bus protocols). The SMSC  
hub’s I2C EEPROM interface is designed to attach to a single “dedicated” I2C EEPROM, and it  
conforms to the Standard-mode I2C specification (100 kbit/s transfer rate and 7-bit addressing) for  
protocol and electrical compatibility.  
Note: Extensions to the I2C specification are not supported.  
The hub acts as the master and generates the serial clock SCL, controls the bus access (determines  
which device acts as the transmitter and which device acts as the receiver), and generates the START  
and STOP conditions.  
8.2.2.1  
8.2.2.2  
Implementation Characteristics  
The hub will only access an EEPROM using the sequential read protocol.  
Pull-Up Resistor  
The circuit board designer is required to place external pull-up resistors (10 kΩ recommended) on the  
SDA / SMBDATA & SCL / SMBCLK / CFG_SEL[0] lines (per SMBus 1.0 specification, and EEPROM  
manufacturer guidelines) to VDD33 in order to assure proper operation.  
2
8.2.2.3  
I C EEPROM Slave Address  
The slave address is 1010000.  
Note: 10-bit addressing is NOT supported.  
8.2.3  
In-Circuit EEPROM Programming  
The EEPROM can be programmed via ATE (automatic test equipment) by pulling RESET_N low  
(which tri-states the hub’s EEPROM interface and allows an external source to program the EEPROM).  
Revision 1.0 (3-11-09)  
52  
SMSC USB251x  
DATASHEET  
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