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CX20431-21 参数 Datasheet PDF下载

CX20431-21图片预览
型号: CX20431-21
PDF下载: 下载PDF文件 查看货源
内容描述: AccessRunner ADSL -USB调制解调器设备设置 [AccessRunner ADSL-USB Modem Device Set]
分类和应用: 调制解调器
文件页数/大小: 56 页 / 363 K
品牌: CONEXANT [ CONEXANT SYSTEMS, INC ]
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AccessRunner ADSL-USB Modem Device Set Data Sheet  
ARM Processor  
Host  
Interface  
RAM  
ROM  
Control Logic  
GPIO  
External  
Memory  
Controller  
(EMC)  
SDRAM  
or SRAM  
ADSL  
ADSL  
Interface  
Data Pump  
and AFE  
EEPROM  
Interface  
EEPROM  
USB  
USB  
Interface  
100427 F2-1_BD_P5200  
Figure 2-1. P5200 UIC Block Diagram  
Host Interface  
The Host Interface is a 16-bit data and 21-bit address bus used for control of the ADSL Data Pump.  
ADSL Interface  
The ADSL Interface is responsible for data transfer to and from the ADSL Data Pump and the setup of the AFE.  
USB Interface  
The USB Interface is responsible for data transfer to and from the USB, by extracting clock and data from the USB cable. It  
also handles the front end functions of the USB protocol such as Sync Field Identification, NRZI-NRZ Conversion, Bit  
Stripping and Stuffing, and CRC functions. Additionally, the USB port converts the serial packet to 8-bit parallel data. Control  
transfers addressed to End Point Zero are handled by the USB port.  
LED Interface  
GPIO are used to support the following LED signals: Power, Ready, Showtime, TXD, and RXD.  
EEPROM Interface  
A 2-wire serial EEPROM is used to store USB device, configuration, interface, and endpoint descriptors. Device descriptors  
include Vendor ID, Product ID, Device Release Number, Manufacturer Name, Product Name, and Serial Number. Both 4196  
bit and 2048 bit EEPROMs are supported. The EEPROM speed must be capable of 400 kHz clock frequency.  
A typical 4196 bit (512 x 8) EEPROM that meets P5200 UIC requirements is the Fairchild M24C04M8 or equivalent.  
A typical 2048 bit (256 x 8) EEPROM that meets P5200 UIC requirements is the Fairchild M24C02M8 or equivalent.  
General Purpose Input/Output Interface  
Most General Purpose Input/Output (GPIO) pins are programmed for dedicated system functions or reserved for test or  
growth functions and are not available for user assignment. Each GPIO pin is controlled individually for input/output direction.  
All GPIO pins can serve as external interrupt inputs.  
Conexant  
100427B  
2-3  
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