Method and control system for the synchronized transmission of digital data

US5969631A · kind A · utility

Assignee

• Temic Telefunken Microelectronik · DE

Inventors

• Manfred Ammler · Bergheim, DE
• Peter Hora · Schrobenhausen, DE
• Guenter Fendt · Schrobenhausen, DE
• Norbert Mueller · Ostseebad Nienhagen, DE

Key dates

• Filing date: Jun 16, 1997
• Grant date: Oct 19, 1999
• Expiry date: Jun 16, 2017

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L7/046
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

In a method and system for transmitting digital data, a data acceptance clock signal generator that has a controllable clock frequency in a peripheral module is correspondingly adapted to clock frequency information derived from a synchronization pulse train transmitted by a central unit. The same oscillator is used as a frequency source for determining the clock frequency information and for generating the data acceptance clock pulse. In this manner, simple RC oscillators are adequate to fulfill any requirements of long time accuracy of the oscillator. The clock frequency can be changed in that the central unit simply transmits altered clock frequency information. It is also possible to carry out an adjustment or adaptation in the case of deviations of the oscillator frequency in the peripheral unit. Preferably, the clock frequency information is derived from the reciprocal value of the time duration of at least one synchronization pulse, which is determined in a quantized manner by a first counter in a clock frequency information acquisition circuit which counts the number of oscillator pulses occurring during the synchronization pulse. The resulting count value is provided to a …