CN207560242U - Vehicle-mounted Ethernet AVB synchronous clock generators - Google Patents
Vehicle-mounted Ethernet AVB synchronous clock generators Download PDFInfo
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- CN207560242U CN207560242U CN201721708083.5U CN201721708083U CN207560242U CN 207560242 U CN207560242 U CN 207560242U CN 201721708083 U CN201721708083 U CN 201721708083U CN 207560242 U CN207560242 U CN 207560242U
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Abstract
A kind of vehicle-mounted Ethernet AVB synchronous clock generators, including Ethernet PHY chip, first Main Processor Unit, second Main Processor Unit, clock generator, DSP module, voltage controlled oscillator, clock module is equipped in second Main Processor Unit, PWM module, clock compares and PWM generator, Ethernet PHY chip is connect with the first Main Processor Unit, clock generator connects the first Main Processor Unit, precision clock synchronization module is equipped in first Main Processor Unit, it is connected with the second Main Processor Unit, clock module is compared by clock and PWM generator, PWM module is connected with voltage controlled oscillator, voltage controlled oscillator passes through DSP module, clock module is compared with clock and PWM generator is connected, DSP module is connected with the first Main Processor Unit.The utility model, which improves traditional technology, must rely on the loop design of phaselocked loop, greatly improve the robustness of design, improve the dynamic tuning performance of product.
Description
Technical field
The utility model is related to electricity field more particularly to vehicle-mounted audio-visual synchronization clock generating circuits, particularly a kind of
Vehicle-mounted Ethernet AVB synchronous clock generators.
Background technology
In the prior art, the vehicle-mounted widely used PHASE-LOCKED LOOP PLL TECHNIQUE of audio-visual synchronization clock generating circuit.Phaselocked loop scheme has
Its own advantage, as precision is high and easy to use.But its shortcoming it is also obvious that first, can not achieve dynamic adjust, every time
Adjust frequency, all can losing lock, then relock process, centre has several milliseconds of uncertain time；Secondth, Costco Wholesale
It is high；Third, phase-locked loop operation frequency are programmed, are easily influenced by software fault etc..
Utility model content
The purpose of this utility model is to provide a kind of vehicle-mounted Ethernet AVB synchronous clock generators, this vehicles
Carrying Ethernet AVB synchronous clock generators will solve to use the vehicle-mounted audio-visual synchronization clock generating circuit of PHASE-LOCKED LOOP PLL TECHNIQUE cannot
The technical issues of dynamic adjusts frequency, of high cost and performance indicator is poor.
This vehicle-mounted Ethernet AVB synchronous clock generators of the utility model, including Ethernet PHY chip（That is ether
Net physical chip）, the first Main Processor Unit, the second Main Processor Unit, clock generator, DSP module, voltage controlled oscillator, institute
Clock module, PWM module are equipped in the second Main Processor Unit stated（That is Pulse width modulation module）, clock compare and PWM hair
Raw device（That is pulse width modulation generator）, wherein, the ethernet device outside the connection of described Ethernet PHY chip one end,
The other end connects the first Main Processor Unit, and the output terminal of clock generator connects the input terminal of the first Main Processor Unit, described
Precision clock synchronization module, the output terminal of precision clock synchronization module and the second main process task list are provided in first Main Processor Unit
The input terminal of member is connected, and the output terminal of the clock module in the second Main Processor Unit is compared by clock and PWM generator, PWM
Module is connected with the input terminal of voltage controlled oscillator, the output terminal of voltage controlled oscillator by DSP module, the second Main Processor Unit when
Clock module is compared with clock and the input terminal of PWM generator is connected, another output terminal of DSP module and the first Main Processor Unit
Input terminal is connected.
Further, the output terminal of the precision clock synchronization module in the first Main Processor Unit of embodiment one and described the
The input terminal of clock module in two Main Processor Units is connected.
Further, the output terminal of the clock generator of embodiment two passes through the first Main Processor Unit and the second main process task list
The input terminal of the clock module of member is connected, the output terminal of the precision clock synchronization module in the first Main Processor Unit and the second main place
The clock of reason unit compares and PWM generator is connected.
The utility model compares with prior art, and effect is positive and apparent.The utility model it is this vehicle-mounted
Embodiment that there are two types of Ethernet AVB synchronous clock generators, the 802.AS agreements according to as defined in IEEE of embodiment one can pass through
Precision clock synchronization module restores the synchronised clock of Ethernet external equipment in the first main processor unit.The utility model
Based on the synchronised clock, the low-frequency clock in a crystal oscillator period based on external ethernet equipment is generated, that is to say, that the low frequency
The error of clocking error and external ethernet equipment is consistent.On the other hand, the utility model is by voltage controlled oscillator,
Also the clock of a similary rate-adaptive pacemaker, the frequency error of this clock and the frequency of voltage controlled oscillator are generated inside DSP module
Error is consistent.In the second main processor unit, PWM duty cycle can be adjusted, pwm signal is converted into analog signal,
The voltage of voltage controlled oscillator can be changed, and then change the rate-adaptive pacemaker of voltage controlled oscillator.In the second main processor unit
Compare the circular error of two clocks by clock module, the frequency of oscillation of DSP module is adjusted finally by PWM duty cycle, directly
It is consistent to two low frequency output frequencies, so as to complete closed-loop control.
The frequency that the difference of embodiment two and embodiment one is mainly generated in the first Main Processor Unit is to be based on clock
The local clock that device generates, the external ethernet clock that then precision clock synchronization module is generated and the first Main Processor Unit
The relative error of local clock is sent to the second Main Processor Unit.Second Main Processor Unit mends the error in frequency comparator
It repays, then compared with the clock of DSP module.Other links are similar with embodiment one, finally complete closed-loop control.
The utility model provides a kind of novel vehicle-mounted Ethernet AVB synchronous clock generator solutions.This practicality
Novel improved traditional technology must rely on the loop design of phaselocked loop, greatly improve the robustness of designing scheme, carry
The dynamic tuning performance of product has been risen, while has reduced design cost.
Description of the drawings：
Fig. 1 is the connection diagram of the embodiment one of the vehicle-mounted Ethernet AVB synchronous clock generators of the utility model.
Fig. 2 is the connection diagram of the embodiment two of the vehicle-mounted Ethernet AVB synchronous clock generators of the utility model.
Specific embodiment
Embodiment 1:
As shown in Figure 1, this vehicle-mounted Ethernet AVB synchronous clock generators of the utility model, including ethernet PHY core
Piece 2, the first Main Processor Unit 4, the second Main Processor Unit 5, clock generator 3, DSP module 6, voltage controlled oscillator 7, described
In two Main Processor Units 5 be equipped with clock module 8, PWM module 11, clock compares and PWM generator 10, wherein, the ether
The external ethernet device 1 of 2 one end of net PHY chip connection, the other end the first Main Processor Unit 4 of connection, clock generator 3 it is defeated
Outlet connects the input terminal of the first Main Processor Unit 4, and precision clock synchronization module is provided in first Main Processor Unit 4
9, the output terminal of precision clock synchronization module 9 is connected with the input terminal of the second Main Processor Unit 5, in the second Main Processor Unit 5
The output terminal of clock module 8 is compared by clock and PWM generator 10, PWM module 11 and the input terminal phase of voltage controlled oscillator 7
Even, the output terminal of voltage controlled oscillator 7 by DSP module 6, the second Main Processor Unit 5 clock module 8 compared with clock and PWM
The input terminal of generator 10 is connected, and another output terminal of DSP module 6 is connected with the input terminal of the first Main Processor Unit 4.
Further, the output terminal and described second of the precision clock synchronization module 9 in first Main Processor Unit 4
The input terminal of clock module 8 in Main Processor Unit 5 is connected.
Embodiment 2：
As shown in Fig. 2, this vehicle-mounted Ethernet AVB synchronous clock generators of the utility model, including ethernet PHY core
Piece 2, the first Main Processor Unit 4, the second Main Processor Unit 5, clock generator 3, DSP module 6, voltage controlled oscillator 7, described
In two Main Processor Units 5 be equipped with clock module 8, PWM module 11, clock compares and PWM generator 10, wherein, the ether
The external ethernet device 1 of 2 one end of net PHY chip connection, the other end the first Main Processor Unit 4 of connection, clock generator 3 it is defeated
Outlet connects the input terminal of the first Main Processor Unit 4, and precision clock synchronization module is provided in first Main Processor Unit 4
9, the output terminal of precision clock synchronization module 9 is connected with the input terminal of the second Main Processor Unit 5, in the second Main Processor Unit 5
The output terminal of clock module 8 is compared by clock and PWM generator 10, PWM module 11 and the input terminal phase of voltage controlled oscillator 7
Even, the output terminal of voltage controlled oscillator 7 by DSP module 6, the second Main Processor Unit 5 clock module 8 compared with clock and PWM
The input terminal of generator 10 is connected, and another output terminal of DSP module 6 is connected with the input terminal of the first Main Processor Unit 4.
Further, the output terminal of clock generator 3 by the first Main Processor Unit 4 and the second Main Processor Unit 5 when
The input terminal of clock module 8 is connected, the output terminal and the second main process task of the precision clock synchronization module 9 in the first Main Processor Unit 4
The clock of unit 5 compares and PWM generator 10 is connected.
The utility model, which improves traditional technology, must rely on the loop design of phaselocked loop, greatly improve design side
The robustness of case, improves the dynamic tuning performance of product, while reduces design cost.
Claims (3)
1. a kind of vehicle-mounted Ethernet AVB synchronous clock generators, including Ethernet PHY chip, the first Main Processor Unit, the second master
Processing unit, clock generator, DSP module, voltage controlled oscillator are equipped with clock module, PWM in second Main Processor Unit
Module, clock compare and PWM generator, it is characterised in that：Ethernet outside Ethernet PHY chip one end connection is set
Standby, the other end connects the first Main Processor Unit, and the output terminal of clock generator connects the input terminal of the first Main Processor Unit, described
The first Main Processor Unit in be provided with precision clock synchronization module, the output terminal of precision clock synchronization module and the second main process task
The input terminal of unit is connected, the output terminal of the clock module in the second Main Processor Unit is compared by clock and PWM generator,
PWM module is connected with the input terminal of voltage controlled oscillator, and the output terminal of voltage controlled oscillator passes through DSP module, the second Main Processor Unit
Clock module is compared with clock and the input terminal of PWM generator is connected, another output terminal of DSP module and the first main process task list
The input terminal of member is connected.
2. vehicle-mounted Ethernet AVB synchronous clock generators as described in claim 1, it is characterised in that：Embodiment one it is described
The output terminal of precision clock synchronization module in first Main Processor Unit and the clock module in second Main Processor Unit
Input terminal is connected.
3. vehicle-mounted Ethernet AVB synchronous clock generators as described in claim 1, it is characterised in that：Embodiment two it is described
The output terminal of clock generator is connected by the first Main Processor Unit with the input terminal of the clock module of the second Main Processor Unit, the
The output terminal of precision clock synchronization module in one Main Processor Unit is compared with the clock of the second Main Processor Unit and PWM generator
It is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721708083.5U CN207560242U (en) | 2017-12-11 | 2017-12-11 | Vehicle-mounted Ethernet AVB synchronous clock generators |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721708083.5U CN207560242U (en) | 2017-12-11 | 2017-12-11 | Vehicle-mounted Ethernet AVB synchronous clock generators |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207560242U true CN207560242U (en) | 2018-06-29 |
Family
ID=62665560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721708083.5U Withdrawn - After Issue CN207560242U (en) | 2017-12-11 | 2017-12-11 | Vehicle-mounted Ethernet AVB synchronous clock generators |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207560242U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107864394A (en) * | 2017-12-11 | 2018-03-30 | 延锋伟世通电子科技（上海）有限公司 | A kind of vehicle-mounted Ethernet AVB synchronous clock generators |
-
2017
- 2017-12-11 CN CN201721708083.5U patent/CN207560242U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107864394A (en) * | 2017-12-11 | 2018-03-30 | 延锋伟世通电子科技（上海）有限公司 | A kind of vehicle-mounted Ethernet AVB synchronous clock generators |
| CN107864394B (en) * | 2017-12-11 | 2023-08-29 | 延锋伟世通电子科技（上海）有限公司 | Vehicle-mounted Ethernet AVB synchronous clock generator |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20180629 Effective date of abandoning: 20230829 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20180629 Effective date of abandoning: 20230829 |