WO2004049619A1 - Verfahren zur automatischen erkennung der taktfrequenz eines systemtaktes für die konfiguration einer peripherie-einrichtung - Google Patents
Verfahren zur automatischen erkennung der taktfrequenz eines systemtaktes für die konfiguration einer peripherie-einrichtung Download PDFInfo
- Publication number
- WO2004049619A1 WO2004049619A1 PCT/EP2003/012350 EP0312350W WO2004049619A1 WO 2004049619 A1 WO2004049619 A1 WO 2004049619A1 EP 0312350 W EP0312350 W EP 0312350W WO 2004049619 A1 WO2004049619 A1 WO 2004049619A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- clock
- system clock
- peripheral device
- clock frequency
- frequency
- Prior art date
Links
- 230000002093 peripheral effect Effects 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000005540 biological transmission Effects 0.000 claims description 21
- 238000001514 detection method Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 230000001419 dependent effect Effects 0.000 claims description 3
- 238000011161 development Methods 0.000 description 10
- 230000018109 developmental process Effects 0.000 description 10
- 238000004891 communication Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0685—Clock or time synchronisation in a node; Intranode synchronisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0008—Synchronisation information channels, e.g. clock distribution lines
- H04L7/0012—Synchronisation information channels, e.g. clock distribution lines by comparing receiver clock with transmitter clock
Definitions
- the present invention relates to a method for automatically detecting the clock frequency of a system clock for the configuration of a peripheral device, and in particular to a method for automatically detecting the clock frequency of a system clock for the configuration of a mobile radio peripheral device.
- a peripheral device such as a Bluetooth module
- the peripheral device or module is to use the same system clock, typically, for example, 10-100 MHz, as the main device or host device.
- FIG. 3 schematically shows a known arrangement for implementing a data exchange 14 between a first interface 11 of a host 10 and a second interface 13 of a peripheral module or peripheral device 12 depending on a system clock 15.
- the main device 10 or the host and the peripheral module 12 each carry out the data exchange 14 via an interface 11, 13.
- both the host 10 and the module 12 are able to process or cover a certain frequency range of system clocks 15 or their frequencies. To be able to guarantee this, a configuration of both the host 10 and the peripheral module 12 to the system clock 15 is necessary.
- a possible, known arrangement according to FIG. 2 is illustrated using the example of the peripheral module 12.
- the system clock 15 is fed to the peripheral device 12 and processed by a PLL (phase locked loop), ie a phase locked loop 17, in a constant clock 18, which in turn is an interface 13 and / or a processing device 19, such as a processor , a controller or a memory.
- PLL phase locked loop
- a constant clock 18 which in turn is an interface 13 and / or a processing device 19, such as a processor , a controller or a memory.
- the system is constructed in such a way that only the host 10 knows the exact system clock, or the host 10 can vary the clock in operation and must then inform the module 12 of this.
- the module 12 therefore does not have a separate memory or the like, in which information about the system clock is contained.
- the interface 13 of the module 12 must be set to a certain transmission rate, typically e.g. 10 kbaud to 10 Mbaud can be configured, this interface transmission rate for the main device 10 as well as for the peripheral module 12 must be within a certain tolerance range, which is defined, for example, by an interface standard.
- the actual transmission rate is dependent on the system clock 15 if the clock for supplying the individual internal components 13, 17, 19 of the peripheral device 12 is derived from the system clock 15 and is consequently proportional to it.
- the information about the system clock 15 can be communicated to the module 12 in such a way that in the initialization phase all internal components 13, 17, 19 of the module 12 are supplied with the system clock 15 or with predetermined clock ratios of this clock become.
- This requirement must be met by module 12 as well as software-wise be ensured in a predetermined min./max. range of the system clock 15.
- the transmission rate of the interface 13 is then selected as a fixed ratio to the system clock 15, which ensures that the main device 10 and the peripheral device 12 have the same transmission rate at the interfaces 11, 13 and can therefore communicate with one another.
- the module 12 is then informed about the system clock and also about the desired transmission rate of the interfaces 11, 13 via this interface 13.
- the host 10 can then switch the interface transfer rate after the module has been configured to the known system clock 15 and has set the interface transfer rate.
- a complex configuration of the peripheral module must therefore be carried out on the system clock.
- the known system implementation assumes that the transmission rate of the interface in the initialization phase must be set as a fixed ratio to the system clock so that the host and the module provide the same transmission rate at their interfaces.
- this object is achieved by the method for automatic detection of the clock frequency of a system clock for the configuration of a peripheral device.
- the idea on which the present invention is based essentially consists in adding a further clock signal with a to both the main device and the peripheral device To provide exactly known clock frequency, which is used for example for low-power modes, such as a clock clock signal at 32.768 kHz.
- the problem mentioned at the outset is solved in particular by providing a method for automatically detecting the clock frequency of a system clock for the configuration of a peripheral device, comprising the steps of: generating a secondary clock with a predetermined clock frequency; Creation of the system clock and a secondary clock to a host; Applying the system clock and the secondary clock to the peripheral device; Determining the clock frequency of the system clock in the peripheral device by means of the secondary clock; and configuring the peripheral device with the determined system clock.
- the system clock is determined by counting a number of edge changes of the system clock within a predetermined number of periods of the secondary clock.
- an identical interface transmission rate of the first and second interfaces is set as a function of the system clock determined.
- the interface transmission rate is set to an interface transmission rate determined by the standard of the interfaces.
- the system clock can be direction can be changed, with a new system clock then being communicated to the peripheral device exactly via the interfaces.
- both tolerances of the system clock and of the secondary clock are taken into account when determining the system clock by the peripheral device.
- the transmission rate of the data transmission between the first and the second interface is dependent on the system clock.
- the clock frequency of the system clock is variable with predetermined clock frequencies and is determined by the main device after an initialization phase.
- the clock frequency of the system clock automatically determined by the peripheral device has discrete clock frequencies which are compared in the peripheral device with discrete clock frequencies stored in a table in order to use the table value of the clock frequency as the current clock frequency of the system clock ,
- a PLL circuit in the peripheral device generates a constant clock frequency from the system clock frequency, which is fed to the second interface and / or a processing device such as a processor, controller or memory.
- Figure 1 is a schematic block diagram for explaining an embodiment of the present invention
- Figure 2 is a schematic block diagram of a known peripheral device
- Figure 3 is a schematic block diagram of a conventional arrangement.
- FIG. 1 shows an arrangement for automatically determining the clock frequency of a system clock according to an embodiment of the present invention.
- the arrangement according to FIG. 1 has a main device 10 or a host which has a first interface 11.
- a peripheral device 12 is also provided, which also has an interface 13.
- a data exchange 14 is to be made possible between the first interface 11 of the main device 10 and the second interface 13 of the peripheral device or the peripheral module.
- a system clock 15 is fed to both the host device 10 and the peripheral module 12.
- both the peripheral module 12 and the host device 10 are supplied with a second secondary clock signal 16.
- the peripheral module 12 preferably has a structure described with reference to FIG. 2.
- a secondary clock 16 with a certain known clock frequency for example a quartz clock clock frequency
- the peripheral device 12 or the module can then determine the clock frequency of the system clock 15, which is also present, by knowing the clock frequency of the secondary clock 16 by, for example, the number of edge changes or rising or falling edges of the system clock
- the clock frequency of the system clock which is automatically determined by the peripheral device 12, including a possible error due to possible tolerances of the supplied system clock 15 and secondary clock 16, can be used. With this automatically determined clock frequency of the system clock, which is automatically determined by the peripheral device 12, including a possible error due to possible tolerances of the supplied system clock 15 and secondary clock 16, can be used. With this automatically determined clock frequency of the system clock, which is automatically determined by the peripheral device 12, including a possible error due to possible tolerances of the supplied system clock 15 and secondary clock 16, can be used. With this automatically determined clock frequency of the
- System clock is then the interface 13 in the peripheral device 12 to a by the interface standard, e.g. RS232, defined interface transfer rate set. Since those accepted by the first and second interfaces 11, 13 of the main and peripheral device 10, 12
- Tolerances in the interface transmission rate are generally much greater than the tolerances that can be expected in the system clock 15 or in the secondary clock 16, but communication can still take place between the host 10 and the module 12. Subsequently, the peripheral module 12 can be informed by the main device 10 of the exact system clock via the data exchange 14, which is carried out via the interfaces 11, 13.
- the system clock 15 does not have any clocks or frequency values, but rather only predetermined discrete clockings or possible frequency values occur, these can be stored, for example, in a table in the peripheral device 12, which is then automatically updated by the Peripheral device 12 determined clock frequency of the clock signal 15 are compared. The closest table value can then be based on this comparison a clock frequency of the system clock in the peripheral device 12 are used and used, whereby an assignment to an exact clock frequency of the system clock can also take place with possible tolerances of the clock frequency of the system clock 15 and / or the secondary clock.
- the method according to the invention it is consequently not necessary to configure the module in principle to the clock frequency of the system clock 15, but instead there remains the option of setting a different interface transmission rate than the preset between the interfaces 11 and 13 of the host 10 or the peripheral device 12 , which setting is generally standardized.
- the method described does not presuppose that the transmission rate of the interface in an initialization phase is set as a fixed ratio to the clock frequency of the system clock; Data exchange 14 and thus the communication between the host 10 and the peripheral device 12 take place.
- the present invention has been described above with reference to a mobile radio device, it is not restricted to this, but can basically be expanded to any system with a host and a peripheral device between which communication is to take place.
- the method for determining the system clock by counting the edge changes, rising edges or falling edges of the system clock within one or more periods of the secondary clock can be seen as an example and can also be carried out in another way.
- the peripheral device (12) can be a Bluetooth module, for example, and can be configured to the system clock of a mobile radio device, for example a mobile telephone.
- Peripheral device 11 Interface of the main device (data exchange) 12 Peripheral device, peripheral module
- 16 secondary clock e.g. Low-power clock; Clock cycle 32.768 kHz 17 PLL (phase locked loop) phase locked loop
- processing facilities e.g. Processor, controller, memory
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/536,654 US7340633B2 (en) | 2002-11-27 | 2003-11-05 | Method for automatically detecting the clock frequency of a system clock pulse for the configuration of a peripheral device |
DE10393489T DE10393489B4 (de) | 2002-11-27 | 2003-11-05 | Verfahren zur automatischen Erkennung der Taktfrequenz eines Systemtaktes für die Konfiguration einer Peripherie-Einrichtung |
AU2003278174A AU2003278174A1 (en) | 2002-11-27 | 2003-11-05 | Method for automatically detecting the clock frequency of a system clock pulse for the configuration of a peripheral device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10255355.6 | 2002-11-27 | ||
DE10255355A DE10255355A1 (de) | 2002-11-27 | 2002-11-27 | Verfahren zur automatischen Erkennung der Taktfrequenz eines Systemtaktes für die Konfiguration einer Peripherie-Einrichtung |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004049619A1 true WO2004049619A1 (de) | 2004-06-10 |
Family
ID=32335794
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2003/012350 WO2004049619A1 (de) | 2002-11-27 | 2003-11-05 | Verfahren zur automatischen erkennung der taktfrequenz eines systemtaktes für die konfiguration einer peripherie-einrichtung |
Country Status (5)
Country | Link |
---|---|
US (1) | US7340633B2 (de) |
CN (1) | CN100492961C (de) |
AU (1) | AU2003278174A1 (de) |
DE (2) | DE10255355A1 (de) |
WO (1) | WO2004049619A1 (de) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4467350B2 (ja) * | 2004-04-09 | 2010-05-26 | 富士通マイクロエレクトロニクス株式会社 | 情報処理システム及びタイミング調整方法 |
US7626436B2 (en) * | 2007-02-12 | 2009-12-01 | Standard Microsystems Corporation | Automatic system clock detection system |
GB2459733B (en) * | 2008-04-30 | 2012-12-19 | Icera Inc | Clock configuration |
US8089318B2 (en) | 2008-10-17 | 2012-01-03 | Marvell World Trade Ltd. | Methods, algorithms, circuits, and systems for determining a reference clock frequency and/or locking a loop oscillator |
US9277515B2 (en) * | 2013-11-04 | 2016-03-01 | Samsung Electronics Co., Ltd | Precise time tagging of events over an imprecise link |
CN106559156A (zh) * | 2015-09-29 | 2017-04-05 | 中兴通讯股份有限公司 | 时钟频率识别的方法和装置 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5905887A (en) * | 1995-03-01 | 1999-05-18 | Opti Inc. | Clock frequency detection for computer system |
US6121816A (en) * | 1999-04-23 | 2000-09-19 | Semtech Corporation | Slave clock generation system and method for synchronous telecommunications networks |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5459855A (en) * | 1992-08-10 | 1995-10-17 | Hewlett-Packard Company | Frequency ratio detector for determining fixed frequency ratios in a computer system |
US5696950A (en) * | 1993-09-29 | 1997-12-09 | Seiko Epson Corporation | Flexible clock and reset signal generation and distribution system having localized programmable frequency synthesizers |
US5511100A (en) * | 1993-12-13 | 1996-04-23 | Motorola, Inc. | Method and apparatus for performing frequency detection |
US5406228A (en) * | 1994-07-12 | 1995-04-11 | General Instrument | Ring oscillator with frequency control loop |
US6081143A (en) * | 1997-09-26 | 2000-06-27 | Sun Microsystems, Inc. | Frequency comparison and generation in an integrated processor |
US6259722B1 (en) | 1998-07-10 | 2001-07-10 | Siemens Information And Communication Networks, Inc. | Method and system for table implemented frequency selection in a frequency hopping cordless telephone system |
US6294962B1 (en) * | 1998-12-09 | 2001-09-25 | Cypress Semiconductor Corp. | Circuit(s), architecture and method(s) for operating and/or tuning a ring oscillator |
JP2001013179A (ja) * | 1999-06-29 | 2001-01-19 | Mitsubishi Electric Corp | リングオシレータクロック周波数測定方法、リングオシレータクロック周波数測定回路、およびマイクロコンピュータ |
DE10003258A1 (de) * | 2000-01-26 | 2001-08-09 | Siemens Ag | Digitaler Phasenverstärker |
GB2364203B (en) * | 2000-06-27 | 2004-03-17 | Nokia Mobile Phones Ltd | Synchronisation |
US7454645B2 (en) * | 2005-03-31 | 2008-11-18 | Cypress Semiconductor Corp. | Circuit and method for monitoring the status of a clock signal |
-
2002
- 2002-11-27 DE DE10255355A patent/DE10255355A1/de not_active Withdrawn
-
2003
- 2003-11-05 AU AU2003278174A patent/AU2003278174A1/en not_active Abandoned
- 2003-11-05 CN CNB2003801041418A patent/CN100492961C/zh not_active Expired - Fee Related
- 2003-11-05 DE DE10393489T patent/DE10393489B4/de not_active Expired - Fee Related
- 2003-11-05 US US10/536,654 patent/US7340633B2/en not_active Expired - Fee Related
- 2003-11-05 WO PCT/EP2003/012350 patent/WO2004049619A1/de not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5905887A (en) * | 1995-03-01 | 1999-05-18 | Opti Inc. | Clock frequency detection for computer system |
US6121816A (en) * | 1999-04-23 | 2000-09-19 | Semtech Corporation | Slave clock generation system and method for synchronous telecommunications networks |
Also Published As
Publication number | Publication date |
---|---|
US20060133553A1 (en) | 2006-06-22 |
DE10393489D2 (de) | 2005-10-13 |
DE10393489B4 (de) | 2008-07-31 |
DE10255355A1 (de) | 2004-06-24 |
AU2003278174A1 (en) | 2004-06-18 |
US7340633B2 (en) | 2008-03-04 |
CN1717892A (zh) | 2006-01-04 |
CN100492961C (zh) | 2009-05-27 |
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