摘要
为提高业务多样性,需在数字直放站中加入网络数据拓展功能,而本设计数字直放站的953.32 Mbps内部带宽中仅有90 Mbps可用于传输网络数据,这时在与百兆网络接口交接时就会出现拥塞。另外,网络接口与直放站内部通道采用不同的传输协议,二者传输速率、时钟均不相同。本设计采用校验帧前导码的方式识别有效网络帧,将识别的帧缓存至异步Block-RAM后再发送到内部通道上以隔离两个不同时钟域并提高传输效率降低拥塞几率。实验平台结果表明,设计逻辑功能正确,下载速度峰值可达10 MB/s,均值高于4 MB/s,工作稳定。
To improve the diversity of service mobile data and network data at the same time ,d In igital repeater needs to support the transmission of this design,repeater has 952.32 Mbps bandwidth for user data transmission,but network data takes only 90 Mbps. Congestion will appear when the maximum 100 Mbps input data from network interface comes through 90 Mbps internal channel. On the other hand, the network interface and the internal channel work with different protocol, different rate and different clock. To solve the two problems above, we first check preamble of input frames; then store the identified frames in asynchronous Block-RAM by receive clock; at last, read them out to internal channel by transmit clock. This method can ease congestion from network interface to internal channel and match the data speed. Platform verification shows that the logic function of design is worked and speed is stable with peak download speed at 10MB/s,average download speed above 4 MB/s
出处
《系统仿真技术》
2015年第1期57-62,68,共7页
System Simulation Technology
