CN202353566U - Spread-spectrum-clock signal detection system - Google Patents
Spread-spectrum-clock signal detection system Download PDFInfo
- Publication number
- CN202353566U CN202353566U CN2011204939805U CN201120493980U CN202353566U CN 202353566 U CN202353566 U CN 202353566U CN 2011204939805 U CN2011204939805 U CN 2011204939805U CN 201120493980 U CN201120493980 U CN 201120493980U CN 202353566 U CN202353566 U CN 202353566U
- Authority
- CN
- China
- Prior art keywords
- clock signal
- frequency
- spread spectrum
- spreading
- detection module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Images
Landscapes
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
The utility model discloses a spread-spectrum-clock signal detection system. The signal detection system comprises a spread-spectrum-clock signal input end, a reference-clock signal input end, a frequency-difference detection module, a spread-spectrum pulse detection module, a spread-spectrum-quantity calculation module, a spread-spectrum-quantity reference input end and an output module, wherein the frequency-difference detection module is connected with the spread-spectrum-clock signal input end and the reference-clock signal input end; the spread-spectrum pulse detection module is connected with the spread-spectrum-clock signal input end, the reference-clock signal input end and the frequency-difference detection module; the spread-spectrum-quantity calculation module is connected with the spread-spectrum pulse detection module; the spread-spectrum-quantity reference input end is connected with the spread-spectrum-quantity calculation module; the output module is connected with the spread-spectrum-quantity calculation module; and the spread-spectrum-clock signal detection system judges whether spread-spectrum-clock signals exist according to the size and direction information of spread spectrum quantity of an output signal of the output module. The spread-spectrum-clock signal detection system has the advantages of simple structure and convenience in use.
Description
Technical field
The utility model relates to a kind of signal detection system, refers to a kind of frequency-spreading clock signal detection system whether the high-speed serial data transmission system exists frequency-spreading clock signal that is used for detecting especially.
Background technology
Electromagnetic interference (EMI, Electromagnetic Interference) has two kinds of conducted interference and radiated interference.Conducted interference is meant through conducting medium and arrives another electric network to the coupling of the signal on the electric network (interference).Radiated interference is meant that interference source passes through the space and arrives another electric network to its signal coupling (interference).In high speed circuit board and system design, the pin of high-frequency signal line, integrated circuit, all kinds of connectors etc. all possibly become the radiated interference source with antenna performance, and the ability launching electromagnetic wave also influences other system or the operate as normal of interior other subsystems of native system.Therefore, reducing electromagnetic interference is the key factor that the electronic system design personnel need consider.
In the high-speed serial data transmission system,, tend to use the spread spectrum clock circuit to reduce the EMI radiation in order effectively to reduce the EMI radiation.But, when using the spread spectrum clock circuit to reduce the EMI radiation,, increased the difficulty of receiving terminal reception data greatly, so receiving terminal is necessary the data that transmitting terminal sends are verified because the high-speed serial data transmission system works in the frequency of variation.And the spread spectrum clock circuit can verify accurately and rapidly data that transmitting terminal sends whether correctly, whether meet data and send agreement; Be convenient to location of mistake; And can be according to the reasonable Adjustment System parameter of frequency-spreading clock signal of spread spectrum clock circuit output; Under various data transmit-receive agreements, work in optimum state all the time, regulate clock data recovery circuit and work in optimal parameter.Therefore be necessary to provide a kind of frequency-spreading clock signal detection system whether the high-speed serial data transmission system exists frequency-spreading clock signal that is used for detecting.
Summary of the invention
In view of above content, be necessary to provide a kind of frequency-spreading clock signal detection system whether the high-speed serial data transmission system exists frequency-spreading clock signal that is used for detecting.
A kind of frequency-spreading clock signal detection system; Be used for detecting a high-speed serial data transmission system and whether have a frequency-spreading clock signal; Said frequency-spreading clock signal detection system comprise one be used to import said frequency-spreading clock signal frequency-spreading clock signal input, the reference clock signal input, that is used to import a reference clock signal link to each other with said frequency-spreading clock signal input and said reference clock signal input be used to detect the frequency difference detection module, whether frequency difference is arranged between said frequency-spreading clock signal and the said reference clock signal link to each other with said frequency-spreading clock signal input, said reference clock signal input and said frequency difference detection module the frequency that is used to judge said frequency-spreading clock signal and the spread spectrum pulse detection module, of the frequency height of said reference clock signal link to each other with said spread spectrum pulse detection module the spread spectrum amount computing module, of difference between the frequency of the frequency that is used to calculate said frequency-spreading clock signal and said reference clock signal link to each other with said spread spectrum amount computing module the spread spectrum amount reference input and that is used to import a spread spectrum amount reference clock link to each other with said spread spectrum amount computing module be used to export one comprise the output signal of spread spectrum amount size and directional information output module, spread spectrum amount size and directional information that said frequency-spreading clock signal detection system is exported signal according to said output module judge whether to exist frequency-spreading clock signal.
Preferably; Said spread spectrum pulse detection module is judged the height of frequency of frequency and the said reference clock signal of said frequency-spreading clock signal; And export a spread spectrum amount information to said spread spectrum amount computing module, said spread spectrum amount information is positive spread spectrum amount information or a negative spread spectrum amount information.
Preferably; Said spread spectrum pulse detection module comprise one be used for that said reference clock signal is counted reference clock counter and be used for spread spectrum clock counter that said frequency-spreading clock signal is counted; Said spread spectrum pulse detection module is exported a spread spectrum amount information to said spread spectrum amount computing module through the count results of more said reference clock counter and said spread spectrum clock counter.
Preferably; Said frequency difference detection module is one spacing dark first-in first-out register to be arranged, and the frequency-spreading clock signal of said frequency-spreading clock signal input input has the stacked of spacing dark first-in first-out register and the behavior of popping with the asynchronous respectively control of reference clock signal of said reference clock signal input input is said.
Preferably, when said frequency difference detection module detects when between said frequency-spreading clock signal and the said reference clock signal frequency difference being arranged, said frequency difference detection module is exported a clock frequency difference marker pulse to said spread spectrum pulse detection module.
Preferably; When said frequency difference detection module detects when not having frequency difference between said frequency-spreading clock signal and the said reference clock signal; Said frequency difference detection module is exported an idle index signal to said spread spectrum pulse detection module, makes said spread spectrum pulse detection module keep current state.
Relative prior art; The utility model frequency-spreading clock signal detection system can fast detecting go out whether there is frequency-spreading clock signal in the high-speed serial data transmission system; Whether the data of further verifying the transmitting terminal transmission accurately and rapidly are correct, regulate clock data recovery circuit and work in optimal parameter, thereby effectively reduce the EMI radiation; The utility model is simple in structure, and easy to use.
Description of drawings
Fig. 1 is the system block diagram of the utility model frequency-spreading clock signal detection system preferred embodiments.
Fig. 2 to Fig. 4 is the operation principle view of the utility model frequency-spreading clock signal detection system preferred embodiments middle frequency difference detection module.
Fig. 5 is the operation principle sketch map of spread spectrum pulse detection module in the utility model frequency-spreading clock signal detection system preferred embodiments.
Fig. 6 is the operation principle sketch map of spread spectrum amount computing module in the utility model frequency-spreading clock signal detection system preferred embodiments.
Embodiment
See also Fig. 1, the utility model frequency-spreading clock signal detection system preferred embodiments comprises the output module that spread spectrum amount reference input and that spread spectrum amount computing module, that spread spectrum pulse detection module, that frequency difference detection module, that a frequency-spreading clock signal input, a reference clock signal input, link to each other with this frequency-spreading clock signal input and this reference clock signal input links to each other with this frequency-spreading clock signal input, this reference clock signal input and this frequency difference detection module links to each other with this spread spectrum pulse detection module links to each other with this spread spectrum amount computing module links to each other with this spread spectrum amount computing module.
This frequency-spreading clock signal input is used to import a frequency-spreading clock signal; This reference clock signal input is used to import a reference clock signal; Between the reference clock signal that the frequency-spreading clock signal that this frequency difference detection module is used to detect this frequency-spreading clock signal input input and this reference clock signal input are imported whether frequency difference is arranged; This spread spectrum pulse detection module is according to the pulse signal of this frequency difference detection module output; Judge the height of the frequency of the reference clock signal that frequency and this reference clock signal input of the frequency-spreading clock signal of this frequency-spreading clock signal input input are imported, and export a positive spread spectrum amount information or a negative spread spectrum amount information to this spread spectrum amount computing module; This spread spectrum amount reference input is used to import a spread spectrum amount reference clock; This spread spectrum amount computing module calculates the difference between the frequency of the reference clock signal that frequency and this reference clock signal input of the frequency-spreading clock signal of this frequency-spreading clock signal input input import according to the spread spectrum amount information that receives and spread spectrum amount reference clock; This output module comprises the output signal of spread spectrum amount size and directional information according to the difference signal output one that receives, and can judge whether to exist frequency-spreading clock signal according to the spread spectrum amount size and the directional information of this output signal.
Please consult Fig. 2 to Fig. 4 simultaneously, Fig. 2 to Fig. 4 is the operation principle view of the utility model frequency-spreading clock signal detection system preferred embodiments middle frequency difference detection module.Suppose that this frequency difference detection module is one spacing dark first-in first-out register to be arranged, and the asynchronous respectively control of reference clock signal of the frequency-spreading clock signal of this frequency-spreading clock signal input input and the input of this reference clock signal input this stacked of spacing dark first-in first-out register arranged and the behavior of popping.When this frequency difference detection module works on power; At first get into half-full state shown in Figure 2; Between the reference clock signal of importing according to the frequency-spreading clock signal of this frequency-spreading clock signal input input and this reference clock signal input whether frequency difference is arranged; Following several kinds of responses are arranged respectively: (1) is when between the reference clock signal that the frequency-spreading clock signal of this frequency-spreading clock signal input input and this reference clock signal input are imported during no frequency difference; See also Fig. 2, this have spacing dark first-in first-out register in the unit interval stacked number of times equal the number of times of popping in the unit interval, this has spacing dark first-in first-out register to keep half-full state; (2) when the frequency of the frequency-spreading clock signal of this frequency-spreading clock signal input input during greater than the frequency of the reference clock signal of this reference clock signal input input; See also Fig. 3; This have spacing dark first-in first-out register in the unit interval stacked number of times greater than the number of times of popping in the unit interval; It is full that this has spacing dark first-in first-out register stack to be write, and promptly stack pointer is positioned at stack top, when coming a new stacked indication again; To export a clock frequency difference marker pulse, this has spacing dark first-in first-out register to be reset to half-full state shown in Figure 2; (3) when the frequency of the frequency-spreading clock signal of this frequency-spreading clock signal input input during less than the frequency of the reference clock signal of this reference clock signal input input; See also Fig. 4; This have spacing dark first-in first-out register in the unit interval stacked number of times less than the number of times of popping in the unit interval; This has spacing dark first-in first-out register stack will be read sky, and promptly stack pointer is positioned at the bottom of the stack, when coming new popping to indicate again; Also will export a clock frequency difference marker pulse, this has spacing dark first-in first-out register to be reset to half-full state shown in Figure 2.Between the reference clock signal that this frequency difference detection module detects the input of this frequency-spreading clock signal input according to above-mentioned operation principle frequency-spreading clock signal and this reference clock signal input are imported whether frequency difference is arranged; When frequency difference; The marker pulse of output clock frequency difference is to this spread spectrum pulse detection module; This spread spectrum pulse detection module is judged the height of the frequency of the frequency of the frequency-spreading clock signal that this frequency-spreading clock signal input is imported and the reference clock signal that this reference clock signal input is imported; And export a positive spread spectrum amount information or a negative spread spectrum amount information to this spread spectrum amount computing module; This spread spectrum amount computing module calculates the difference between the frequency of the reference clock signal that frequency and this reference clock signal input of the frequency-spreading clock signal of this frequency-spreading clock signal input input import according to the spread spectrum amount reference clock of spread spectrum amount information that receives and the input of this spread spectrum amount reference input; This output module comprises the output signal of spread spectrum amount size and directional information according to the difference signal output that receives, and judges whether to exist frequency-spreading clock signal according to the spread spectrum amount size and the directional information of this output signal; When not having frequency difference, export an idle index signal to this spread spectrum pulse detection module, make this spread spectrum pulse detection module keep current state.
See also Fig. 5, Fig. 5 is the operation principle sketch map of spread spectrum pulse detection module in the utility model frequency-spreading clock signal detection system preferred embodiments.This spread spectrum pulse detection module comprises a reference clock counter and a spread spectrum clock counter; This reference clock counter is counted the reference clock signal of this reference clock signal input input; And export a count results Nref; This spread spectrum clock counter is counted the frequency-spreading clock signal of this frequency-spreading clock signal input input, and exports a count results Nssc.When Nssc < during Nref, this spread spectrum pulse detection module is exported a negative spread spectrum amount information, as Nssc>Nref, this spread spectrum pulse detection module output one positive spread spectrum amount information.
See also Fig. 6, Fig. 6 is the operation principle sketch map of spread spectrum amount computing module in the utility model frequency-spreading clock signal detection system preferred embodiments.Suppose that this spread spectrum pulse detection module exports a negative spread spectrum amount information to this spread spectrum amount computing module; This spread spectrum amount reference input is imported the spread spectrum amount reference clock that is used to quantize the spread spectrum cycle of a low speed; Negative spread spectrum amount to this spread spectrum pulse detection module output is counted; Constantly should take turns count results in level conversion and write a register; Through the cycle and size of reading spread spectrum clock in the register; Calculate the difference between the frequency of frequency and the reference clock signal of this reference clock signal input input of frequency-spreading clock signal of this frequency-spreading clock signal input input, export signal thereby produce the spread spectrum amount, and obtain the sketch map of output spread spectrum clock characteristic shown in Figure 6.This output module is according to the difference signal that receives; Compare with input spread spectrum clock characteristic through exporting the spread spectrum clock characteristic; The output signal that output one comprises spread spectrum amount size and directional information can judge whether to exist frequency-spreading clock signal according to the spread spectrum amount size and the directional information of this output signal.
The operation principle of the utility model frequency-spreading clock signal detection system preferred embodiments is following:
This frequency-spreading clock signal input is imported a frequency-spreading clock signal to this frequency difference detection module and this spread spectrum pulse detection module; This reference clock signal input is imported a reference clock signal to this frequency difference detection module and this spread spectrum pulse detection module, and this spread spectrum amount reference input is imported a spread spectrum amount reference clock to this spread spectrum amount computing module; Between the frequency-spreading clock signal of this this frequency-spreading clock signal input input of frequency difference detection module detection and the reference clock signal of this reference clock signal input input whether frequency difference is arranged; If frequency difference is arranged; Then export a clock frequency difference marker pulse to this spread spectrum pulse detection module; If there is not frequency difference, then export an idle index signal to this spread spectrum pulse detection module; When this spread spectrum pulse detection module is received the clock frequency difference marker pulse of this frequency difference detection module output; Judge the height of the frequency of the frequency of the frequency-spreading clock signal that this frequency-spreading clock signal input is imported and the reference clock signal that this reference clock signal input is imported; And export a positive spread spectrum amount information or a negative spread spectrum amount information to this spread spectrum amount computing module; When this spread spectrum pulse detection module was received the idle index signal of this frequency difference detection module output, then this spread spectrum pulse detection module kept current state; This spread spectrum amount computing module calculates the difference between the frequency of the reference clock signal that frequency and this reference clock signal input of the frequency-spreading clock signal of this frequency-spreading clock signal input input import according to the spread spectrum amount reference clock of spread spectrum amount information that receives and the input of this spread spectrum amount reference input; This output module comprises the output signal of spread spectrum amount size and directional information according to the difference signal output that receives, and judges whether to exist frequency-spreading clock signal according to the spread spectrum amount size and the directional information of this output signal.
The utility model frequency-spreading clock signal detection system can fast detecting go out whether there is frequency-spreading clock signal in the high-speed serial data transmission system; Whether the data of further verifying the transmitting terminal transmission accurately and rapidly are correct; Regulate clock data recovery circuit and work in optimal parameter; Thereby effectively reduce the EMI radiation, the utility model is simple in structure, and easy to use.
Claims (6)
1. frequency-spreading clock signal detection system; Be used for detecting a high-speed serial data transmission system and whether have a frequency-spreading clock signal; It is characterized in that: said frequency-spreading clock signal detection system comprise one be used to import said frequency-spreading clock signal frequency-spreading clock signal input, the reference clock signal input, that is used to import a reference clock signal link to each other with said frequency-spreading clock signal input and said reference clock signal input be used to detect the frequency difference detection module, whether frequency difference is arranged between said frequency-spreading clock signal and the said reference clock signal link to each other with said frequency-spreading clock signal input, said reference clock signal input and said frequency difference detection module the frequency that is used to judge said frequency-spreading clock signal and the spread spectrum pulse detection module, of the frequency height of said reference clock signal link to each other with said spread spectrum pulse detection module the spread spectrum amount computing module, of difference between the frequency of the frequency that is used to calculate said frequency-spreading clock signal and said reference clock signal link to each other with said spread spectrum amount computing module the spread spectrum amount reference input and that is used to import a spread spectrum amount reference clock link to each other with said spread spectrum amount computing module be used to export one comprise the output signal of spread spectrum amount size and directional information output module, spread spectrum amount size and directional information that said frequency-spreading clock signal detection system is exported signal according to said output module judge whether to exist frequency-spreading clock signal.
2. frequency-spreading clock signal detection system as claimed in claim 1; It is characterized in that: said spread spectrum pulse detection module is judged the height of frequency of frequency and the said reference clock signal of said frequency-spreading clock signal; And export a spread spectrum amount information to said spread spectrum amount computing module, said spread spectrum amount information is positive spread spectrum amount information or a negative spread spectrum amount information.
3. frequency-spreading clock signal detection system as claimed in claim 1; It is characterized in that: said spread spectrum pulse detection module comprise one be used for that said reference clock signal is counted reference clock counter and be used for spread spectrum clock counter that said frequency-spreading clock signal is counted; Said spread spectrum pulse detection module is exported a spread spectrum amount information to said spread spectrum amount computing module through the count results of more said reference clock counter and said spread spectrum clock counter.
4. frequency-spreading clock signal detection system as claimed in claim 1; It is characterized in that: said frequency difference detection module is one spacing dark first-in first-out register to be arranged, and the frequency-spreading clock signal of said frequency-spreading clock signal input input has the stacked of spacing dark first-in first-out register and the behavior of popping with the asynchronous respectively control of reference clock signal of said reference clock signal input input is said.
5. frequency-spreading clock signal detection system as claimed in claim 4; It is characterized in that: when said frequency difference detection module detects when between said frequency-spreading clock signal and the said reference clock signal frequency difference being arranged, said frequency difference detection module is exported a clock frequency difference marker pulse to said spread spectrum pulse detection module.
6. frequency-spreading clock signal detection system as claimed in claim 4; It is characterized in that: when said frequency difference detection module detects when not having frequency difference between said frequency-spreading clock signal and the said reference clock signal; Said frequency difference detection module is exported an idle index signal to said spread spectrum pulse detection module, makes said spread spectrum pulse detection module keep current state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204939805U CN202353566U (en) | 2011-12-02 | 2011-12-02 | Spread-spectrum-clock signal detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204939805U CN202353566U (en) | 2011-12-02 | 2011-12-02 | Spread-spectrum-clock signal detection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202353566U true CN202353566U (en) | 2012-07-25 |
Family
ID=46542524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204939805U Withdrawn - After Issue CN202353566U (en) | 2011-12-02 | 2011-12-02 | Spread-spectrum-clock signal detection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202353566U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102404062A (en) * | 2011-12-02 | 2012-04-04 | 四川和芯微电子股份有限公司 | System and method for detecting spread spectrum clock signal |
-
2011
- 2011-12-02 CN CN2011204939805U patent/CN202353566U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102404062A (en) * | 2011-12-02 | 2012-04-04 | 四川和芯微电子股份有限公司 | System and method for detecting spread spectrum clock signal |
| CN102404062B (en) * | 2011-12-02 | 2014-02-12 | 四川和芯微电子股份有限公司 | System and method for detecting spread spectrum clock signal |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102404062B (en) | System and method for detecting spread spectrum clock signal | |
| CN208922244U (en) | A kind of high-speed serial bus suitable for high-performance SOC chip unstrings IP kernel | |
| CN110515788A (en) | A kind of test device of data-interface | |
| CN107729280A (en) | A kind of high-speed differential signal port Impedance and transmission line impedance uniformity control method | |
| CN104991880A (en) | FC-AE-ASM communication board card based on PCI-E interface | |
| CN101441606B (en) | Component-less termination for electromagnetic couplers used in high speed/frequency differential signaling | |
| CN201654774U (en) | Data transmission equipment based on USB2.0 | |
| CN202353566U (en) | Spread-spectrum-clock signal detection system | |
| CN102650677B (en) | PCI-E signal-testing apparatus | |
| CN102571503A (en) | SDLC (System Development Life Cycle) protocol bus communication testing device based on FPGA (Field-Programmable Gate Array) | |
| CN201576353U (en) | Wireless centralization meter reading device | |
| CN208110030U (en) | A kind of communication test plate of ammeter communication module | |
| CN202994311U (en) | RS-485-bus-based wireless temperature sensor | |
| CN203950030U (en) | A kind of parallel communication test circuit for electric energy meter calibrating apparatus | |
| CN100530117C (en) | EMS memory error emulation devices and method | |
| CN210780821U (en) | Intelligent monitoring device for transmission rate of LoRa communication network | |
| CN113253187B (en) | Electric fast transient pulse group test system | |
| CN206096252U (en) | A data processing circuit for RF power reflectometer | |
| CN203433660U (en) | Portable wireless meter reading system of USB (universal serial bus) interface based on CH371 | |
| CN203929947U (en) | A kind of device of easy test Mini SATA signal | |
| CN113259000B (en) | Optical module testing arrangement | |
| CN203490832U (en) | Data collecting and transmitting system based on FPGA (field programmable gate array) and optical fiber communication | |
| CN202748625U (en) | Strain signal parallel-port capturing device | |
| CN202711279U (en) | Ultrahigh frequency electronic tag reader | |
| CN2768335Y (en) | Universal USB interface wireless data transmission module |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP02 | Change in the address of a patent holder |
Address after: 610041 Sichuan city of Chengdu province high tech Zone Kyrgyzstan Road 33 block A No. 9 Patentee after: IPGoal Microelectronics (Sichuan) Co., Ltd. Address before: 402 room 7, building 610041, incubator Park, hi tech Zone, Sichuan, Chengdu Patentee before: IPGoal Microelectronics (Sichuan) Co., Ltd. |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20120725 Effective date of abandoning: 20140212 |
|
| RGAV | Abandon patent right to avoid regrant |