Sampling apparatus for detecting a starting byte in a high-frequency serial data stream

A technology of serial data flow and scanning equipment, applied in the direction of data exchange, digital control, data exchange network, etc. through path configuration, can solve the problem of high price, and achieve the effect of low cost and reliable start byte detection

Active Publication Date: 2021-02-19
弗瑞柏私人有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to be able to achieve reliable start byte detection in scanning devices at such high operating temperatures, special high temperature suitable FPGAs are required, but such FPGAs are expensive

Method used

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  • Sampling apparatus for detecting a starting byte in a high-frequency serial data stream
  • Sampling apparatus for detecting a starting byte in a high-frequency serial data stream

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Embodiment Construction

[0016] For example, the scanning device 10 according to the invention can be used in a position measuring device which is not shown in detail. An external master device 12 , for example a subsequent electronics device, provides a high-frequency serial data stream D to the scanning device 10 . In the current embodiment, data stream D is 8b10b encoded and has a frequency of 6.25 MHz. During idling, the master device 12 transmits an infinite idling data stream, for example with an infinite sequence of bit sequences 0101010101, to the scanning device 10 via the data stream, in order to avoid charging the data line. At an unknown point in time, the master device 12 sends a start byte with the bit sequence 0010111011 in the present embodiment to signal the subsequent data transmission. The scanning device 10 must detect this start byte in order to signal the start of the data transfer to the downstream external data evaluation device 14 by supplying the trigger signal A.

[0017] ...

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Abstract

The invention relates to a sampling apparatus for detecting a starting byte in a high-frequency serial data stream. The sampling apparatus (10) for detecting a starting byte in a high-frequency serialdata stream (D), having a detection unit (16), which is designed to detect the starting byte in the data stream (D), and a clock signal generator (18), which is designed to provide the detection unit(16) with a high-frequency clock signal (T1) synchronised to the data stream (D), wherein the clock signal (T1) has a higher frequency than the data stream (D), wherein the detection unit (16) is formed by a simple logical detection circuit (19) that excludes addition blocks.

Description

technical field [0001] The invention relates to a scanning device for detecting a start byte in a high-frequency serial data stream, in particular for an absolute position measuring device, which has a detection unit and a clock signal generator, the detection unit being constructed For detecting the start byte in the data stream, the clock signal generator is designed to supply the detection unit with a high-frequency clock signal synchronized with the data stream, wherein the clock signal has a higher frequency than the data stream. Background technique [0002] Preference is now given to using absolute position measuring devices which generate absolute measured values ​​which are transmitted via a digital, usually serial, interface to a subsequent logic device. Furthermore, it is often also necessary to transmit commands from the downstream electronics to the position-measuring device via the serial data interface in order to be able to trigger events there. The known Bi...

Claims

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Application Information

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IPC IPC(8): H04L12/40G05B19/414G06F13/42H04L5/14H04L27/156H04L27/26
CPCH04L5/1484H04L12/40013H04L7/0087
InventorU.凯特林M.兰辛
Owner弗瑞柏私人有限公司