10月3日，总部位于加利福尼圣克拉拉的国家半导体声称其最近发布的DP83640是业界第一款集成了IEEE 1588精确时钟协议的以太网收发器接口芯片。
针对运动控制、测量仪器、数据采集以及通信等应用的DP83640用来将分布式网络节点同步到一个主控时钟，其精度可以达到8ns。
新闻要点：
结构图：
关于IEEE 1588可以参考《IEEE 1588是什么?》
Santa Clara, Calif.—National Semiconductor Corp. is touting its latest interface product as the industry's first Ethernet transceiver with integrated hardware support for the IEEE 1588 Precision Time Protocol (PTP).
For applications in motion control, instrumentation, data acquisition and telecommunications, the DP83640 precision PHYTER transceiver synchronizes the distributed network nodes to a master clock with 8-ns accuracy.
National's DP83640 precision PHYTER transceiver integrates hardware time stamping of receive and transmit packets, a high-accuracy IEEE 1588 clock and 12 general-purpose input/output (GPIO) pins that handle simultaneous real-time events or multiple triggers. The DP83640 interfaces with any microcontroller, FPGA or ASIC with an Ethernet media access controller (MAC).
The DP83640 integrates the IEEE 1588 PTP functionality in the physical layer. It records the timestamps as close to the wire as possible, to yield what National claims is the highest accuracy for precision control and the lowest jitter for data acquisition.
By using one of four clock update algorithms the user adjusts the on-board PTP clock to 1-part-per-billion (ppb) accuracy. In addition, a high-precision frequency-controlled oscillator generates a low- jitter, selectable-frequency clock output from the PTP clock. The transceiver also synchronizes the GPIOs directly with the timestamp engine and the PTP clock to extend this accuracy throughout the real-time system.
Pricing: $5.24 each in 1,000-unit quantities.
Availability: Now in a 48-pin LQFP.
Datasheet: click here.
National Semiconductor Corp., 1-800-272-9959, www.national.com
;){kind=link}