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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™)  
6.3 Channel Operation  
pTxMsgDescr[1]->BufferDescr = 0x90000200;  
/* msg descr 2 */  
pTxMsgDescr[2]->BufferDescr = 0x90000200;  
/* msg descr 3 */  
/* only difference is EOM bit */  
pTxMsgDescr[3]->BufferDescr = 0x92000200;  
/* fill data buffer with outbound traffic. each buffer contains 256-bytes of  
data */  
/* set the head pointer, for example for channel 0, to point to the top of */  
/* the just formed message descriptor list */  
/* activate transmit channel by issuing a service request */  
/* ServiceRequest( ACTIVATE_CHANNEL, Group, Channel, Direction ); */  
6.3.16 Channel Activation  
After the previous levels of configuration are completed, individual channels  
within a channel group are ready to be activated. Service requests activate  
channels.  
Each channel within a channel group consists of a transmitter and receiver  
section. Each section is independent of the other and maintains its own state  
machine, configuration registers, and internal resources. To activate both  
transmitter and receiver sections, two separate service requests are required, one  
directed to the transmitter and one to the receiver. MUSYCC responds to each  
service request with the SACK Interrupt Descriptor, notifying the host that the  
task was completed.  
Channel Activation is an asynchronous command from the host interface to a  
transmit or receive section of a channel to jump to a new message. Message  
Descriptors in shared memory describe the attributes of the new message, what to  
do between messages, and the location of message data buffers in memory to use  
for transmit data or receive data.  
6.3.16.1 Transmit  
Channel Activation  
The following describes what MUSYCC does when the transmit channel is  
activated:  
1. Reads the Tx Head Pointer for the channel from shared memory, and stores  
it in the Internal Channel Descriptor map.  
2. Reads the Message Descriptor pointed to by Tx Head Pointer, and stores it  
in Internal Channel Descriptor map.  
3. Checks bit field OWNER and NP in Buffer Descriptor.  
If OWNER = 1, MUSYCC is the buffer owner. Load Channel Descriptor  
map with data buffer pointer and data buffer length. Go to 4.  
If OWNER = 0, MUSYCC is not the buffer owner. Can enter polling mode  
until MUSYCC owns buffer or receives another service request to activate  
channel or jump to new message. Repeat 3.  
100660E  
Conexant  
6-21  
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