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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™)  
End of Message (EOM]  
Reason:  
BLP has transmitted the last bit of a data buffer and the Transmit Buffer  
Descriptor signified the end of a message by the bit field EOM in a  
Transmit Buffer Descriptor. The last EOB and an EOM are coincident and  
result in two separate events being generated.  
Effects:  
Interrupt Descriptor in Interrupt Queue with EVENT = EOM, DIR = 1  
(if MSKEOM = 0 in Transmit Channel Configuration Descriptor).  
BLP and DMAC continue with normal message processing. If the DMAC  
does not receive more data from shared memory before the BLP must  
output the next data bit, the BLP outputs another octet of idle code.  
End of Padfill (EOP]  
Reason:  
BLP has transmitted the specified number of pad fill octets.  
Effects:  
Interrupt Descriptor in Interrupt Queue with EVENT = EOP, DIR = 1  
(if EOPI = 1 in Transmit Channel Configuration Descriptor).  
BLP and DMAC continue with normal message processing. If the DMAC  
does not receive more data from shared memory before the BLP must  
output the next data bit, the BLP outputs another octet of idle code.  
6.4.8.2 Receive Events  
Receive events are informational in nature and do not require channel recovery  
actions.  
End of Buffer (EOB)  
Reason:  
One message is stored across multiple message buffers. MUSYCC reached  
the end of a buffer by servicing a number of octets equal to the bit field  
BLEN in a Receive Buffer Descriptor.  
Effects:  
The Interrupt Descriptor in the Interrupt Queue with EVENT = EOB,  
DIR = 0  
(if EOBI = 1 in Receive Buffer Descriptor).  
BLP and DMAC continue with normal message processing.  
End of Message (EOM)  
Reason:  
BLP detected the end of a message (closing flag or an error condition) in  
the received data stream. Error conditions include ABT, LNG, ALIGN,  
BUFF, and ONR errors.  
Effects:  
Interrupt Descriptor in Interrupt Queue with EVENT = EOM, DIR = 0  
(if MSKEOM = 0 in Receive Channel Configuration Descriptor).  
DMAC sets bit field EOM = 1 in Receive Buffer Status Descriptor  
(if INHRBSD = 0 in Receive Channel Configuration Descriptor).  
BLP and DMAC continue with normal message processing.  
6-34  
Conexant  
100660E  
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