Product category:
Communications ICs (Wired)
News Release from: National Semiconductor | Subject: DP83640 precision Phyter transceiver
Edited by the Electronicstalk Editorial
Team on 03 October 2007
Ethernet transceiver supports IEEE1588
protocol
The DP83640 precision Phyter transceiver synchronises the distributed network nodes to a master clock with 8ns accuracy.
National Semiconductor has released an Ethernet transceiver with integrated hardware support for the IEEE1588 Precision Time Protocol (PTP) For applications in motion control, instrumentation, data acquisition and telecommunications, the DP83640 precision Phyter transceiver synchronises the distributed network nodes to a master clock with 8ns accuracy
This article was originally published on Electronicstalk on 5 Jan 2001 at 8.00am (UK)
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This precision synchronisation is critical to high-performance factory automation, test and measurement, and wireless infrastructure systems.
National's DP83640 precision Phyter transceiver integrates hardware time stamping of receive and transmit packets, a high-accuracy IEEE1588 clock and 12 general-purpose input/output (GPIO) pins that handle simultaneous real-time events or multiple triggers.
The DP83640 interfaces with any microcontroller, field-programmable gate array (FPGA) or application-specific integrated circuit (ASIC) with an Ethernet media access controller (MAC).
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The DP83640 integrates the IEEE1588 PTP functionality in the physical layer.
It records the timestamps as close to the wire as possible, with an 8ns resolution, to yield 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 synchronises the GPIOs directly with the timestamp engine and the PTP clock to extend this accuracy throughout the real-time system.
"Devices that require close co-ordination of events, such as industrial controllers, are increasingly interconnected by Ethernet and synchronised using protocols such as IEEE1588 Precision Time Protocol", said Alexandra Dopplinger, Industrial Segment Marketing Manager Freescale's Network Computing and Systems Group.
"National's Precision Phyter transceiver allows customers to implement IEEE1588 solutions with any ColdFire microcontroller or PowerQUICC communications processor that doesn't already have that capability".
"The Precision Phyter also may be used with some IEEE1588-enabled processors to further improve clock synchronisation accuracy for applications such as test and measurement".
The first reference board to implement the DP83640 precision Phyter transceiver with an MCF5234 ColdFire microcontroller may be ordered from Freescale as M5234BCCKIT.
The DP83640 is the newest addition to the Phyter family, which also includes the DP83848 commercial, industrial and extreme-environment transceivers, and the DP83849 dual-port transceivers with flex-port switching and advanced cable diagnostics.
The Phyter family offers enhanced performance and reliability in a range of temperature ranges to meet the requirements of harsh operating environments.
The DP83640 transceiver supports both versions 1 and 2 of the IEEE1588 PTP specification.
For ease of implementation, the standard register interface used for data transmission and control of the PHY operation also provides control of the IEEE1588 PTP features.
A platform-independent C software library is available to simplify integration by eliminating the need to interact directly with the device registers.
For increased precision and phase accuracy, the DP83640 offers a 100Mbyte synchronous Ethernet mode that eliminates any inaccuracy caused by clock drift between nodes.
The DP83640 also supports 100Base-FX and includes a signal detect pin that allows selection of a wide variety of fibre transceivers.
A powerful cable diagnostic tool is included that features dynamic link quality monitoring, signal-to-noise ratio (SNR) estimation and time domain reflectometry (TDR).
The dynamic link quality monitor developed by National Semiconductor allows designers to implement a fault-prediction mechanism that detects changing or deteriorating link conditions and pro-actively takes corrective action, saving lengthy system downtime and costly repairs.
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