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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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6.0 Basic Operation  
CN8478/CN8474A/CN8472A/CN8471A  
6.4 Protocol Support  
Multichannel Synchronous Communications Controller (MUSYCC™)  
Effects:  
Interrupt Descriptor in Interrupt Queue with EVENT = SFILT, DIR = 0  
(if MSKSFILT = 0 in Receive Channel Configuration Descriptor).  
BLP discards the received message in the FIFO.  
BLP and DMAC continue with normal message processing.  
6.4.8.3 Transmit Errors  
Transmit errors are service-affecting and require a corrective action by a  
controlling device to resume normal bit-level processing.  
Underflow Due to Host  
Ownership of Buffer (ONR)  
In this case, MUSYCC attempts to access the [next] Message Descriptor when the  
prior descriptor contained only a portion of the message (EOM = 0), and  
MUSYCC finds that ownership of the [next] descriptor has not been granted by  
the host (i.e., the next buffer is host-owned).  
This error results when currently transmitting an HDLC message, and no  
additional descriptors are available in a timely manner.  
Once a descriptor is granted, however, MUSYCC assumes ownership of the  
message buffer and continues reading data until the end of buffer is reached. If the  
host reclaims the buffer without MUSYCC granting ownership back to the host, a  
host error occurs, and the effects are indeterminate.  
Reason:  
Degradation of the host subsystem or application software performance.  
Effects:  
Partial HDLC message transmission has occurred.  
Interrupt Descriptor in Interrupt Queue with ERROR = ONR, DIR = 1  
(if MSKBUFF = 0 in Transmit Channel Configuration Descriptor).  
Transmit channel enters abort state where the BLP transmits a repetitive  
abort sequence of 16 consecutive 1s.  
Transmit Buffer Status Descriptor cannot be written.  
Message polling is automatically disabled.  
Transmit channel enters abort state.  
Channel Level Recovery Actions:  
Transmit channel reactivation is required.  
Underflow Due to Internal  
FIFO Buffer Under-Run  
(BUFF)  
In the case of underflow due to internal FIFO buffer under-run, the internal FIFO  
buffer becomes empty when MUSYCC transmits data bits (at the serial interface  
clock rate), and MUSYCC has ownership of a message buffer in shared memory.  
Reasons:  
Degradation of the host subsystem or application software performance.  
Congestion of the PCI bus.  
Effects:  
Interrupt Descriptor in Interrupt Queue with ERROR = BUFF, DIR = 1  
(if MSKBUFF = 0 in Transmit Channel Configuration Descriptor).  
Transmit channel enters abort state where the BLP transmits a repetitive  
abort sequence of 16 consecutive 1s.  
Message polling is automatically disabled.  
Transmit Buffer Status Descriptor is not written.  
Channel Level Recovery Actions:  
Transmit channel reactivation is required.  
6-36  
Conexant  
100660E  
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