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參數(shù)資料
| 型號： | SSCP485PL |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | SSC P485 PL Transceiver IC |
| 中文描述： | 南南合作P485特等收發(fā)芯片 |
| 文件頁數(shù)： | 8/19頁 |
| 文件大?。?/td> | 109K |
| 代理商： | SSCP485PL |
SSC P485 PL Transceiver IC
July 1998
8
Revision 5
24000828
ADVANCE INFORMATION
Transmit/Receive Timing
The SSC P485 timing with contention resolution is shown below. The P485 generates a preamble based on the
first character of the message. Contention resolution requires that the first character of the message be unique
among all possible transmitters in the network. If the channel is available and the transmitter wins contention, a
tracking sync sequence followed by a retransmission of the first character occurs. The P485 also echoes the
first character back to the host allowing the host to determine that the channel was available and to continue
transmitting the message. If the channel was unavailable (the transmitter lost contention), the SO line is tri-
stated and the first character of the received message is passed to the host. The host determines that the
channel was not available (transmitted first character does not match received first character), and the host
enters the receive message mode. Once the end of message is detected, the P485 drives ILD high after 10 bit
times to allow all nodes to arbitrate properly. The end of packet condition is true when 5 consecutive ones are
detected on DI following a stop bit. Figure 6 shows a contention resolution example for two contending
transmitters, and Figure 7 shows the end of message sequence and the assertion of ILD. Refer to Figure 9 for
preamble and data encoding.
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