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CN8474AEPF 参数 Datasheet PDF下载

CN8474AEPF图片预览
型号: CN8474AEPF
PDF下载: 下载PDF文件 查看货源
内容描述: 多通道同步通信控制器( MUSYCC ™ ) [Multichannel Synchronous Communications Controller (MUSYCC?)]
分类和应用: 通信控制器
文件页数/大小: 221 页 / 2104 K
品牌: CONEXANT [ CONEXANT SYSTEMS, INC ]
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CN8478/CN8474A/CN8472A/CN8471A  
6.0 Basic Operation  
Multichannel Synchronous Communications Controller (MUSYCC™)  
6.1 Reset  
6.1.3 Soft Group Reset  
Every supported channel group within MUSYCC has the ability to reset (or  
deactivate) a specific direction for all channels in the group using a single service  
request: the soft group reset service request.  
When a soft group reset is requested, a direction (either transmit or receive) is  
specified in the request, and all channels in the specified group and direction are  
deactivated. For the transmit direction, output signal TDAT is three-stated.  
The host must allow two line clock periods of the clock connected to the  
associated serial port to elapse for this reset to complete before issuing another  
service request.  
When a soft group reset is requested by the host, the service request  
mechanism is used. Normally, every service request is acknowledged by  
MUSYCC with a SACK Interrupt Descriptor. In this case, the host should follow  
up the reset request with a Global Initialization service request.  
6.1.4 Initialization Sequence Example  
The typical power-up or reset initialization sequence is as follows:  
1. PCI configuration.  
2. Soft Chip Reset.  
3. Allocate Shared Memory.  
4. Initialize Shared Memory Channel Group Descriptors and time slot map.  
5. Write the Group Base Pointer values.  
6. Allocate interrupt queue and initialize it.  
7. Set Message Descriptor pointers.  
8. Perform Global Initialization, waiting for SACK.  
9. Perform Group Initialization, waiting for SACK between each service  
request.  
– Group Initialization - Receive Group 0–8  
– Group Initialization - Transmit Group 0–8  
NOTE: SACK for Global Initialization is not written until the Global and Interrupt  
Queue Descriptors are read from memory.  
100660E  
Conexant  
6-3  
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