CN110365335A - A kind of piece internal clock calibration method in technical process and calibration circuit - Google Patents
A kind of piece internal clock calibration method in technical process and calibration circuit Download PDFInfo
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- CN110365335A CN110365335A CN201910739666.1A CN201910739666A CN110365335A CN 110365335 A CN110365335 A CN 110365335A CN 201910739666 A CN201910739666 A CN 201910739666A CN 110365335 A CN110365335 A CN 110365335A
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- 230000004308 accommodation Effects 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 2
- 230000006870 function Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
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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
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/099—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop
- H03L7/0991—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop the oscillator being a digital oscillator, e.g. composed of a fixed oscillator followed by a variable frequency divider
- H03L7/0992—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop the oscillator being a digital oscillator, e.g. composed of a fixed oscillator followed by a variable frequency divider comprising a counter or a frequency divider
-
- 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
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
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Abstract
The present embodiments relate to a kind of calibration method for the clock in technical process and calibration circuit, the calibration method includes: that piece internal clock calibration circuit accesses externally input reference clock square-wave signal；Piece internal clock calibration circuit counts the high level of the reference clock square-wave signal, and the piece clock signal generated simultaneously to internal oscillator counts；When the quantity of externally input reference clock square-wave signal reaches the clock count threshold value, stop the counting, and obtain the count value of current slice clock signal；Compare the count value and the clock count threshold value of piece clock signal；If the count value of described clock signal is more than or less than the clock count threshold value, the electric current of internal oscillator is adjusted to adjust the calibration control word of internal oscillator, to calibrate to described internal clock.
Description
Technical field
The present invention relates to chip design art field more particularly to a kind of piece internal clock calibration sides in technical process
Method and calibration circuit.
Background technique
For digital circuitry, one to stablize accurate clock most important to the work of circuit system.It is nearly all
Digital display circuit processing signal be all to be carried out step by step by clock, system components be also by clock realize synchronize,
The circuit for generating this clock signal is exactly clock circuit.
The core of clock circuit is a more stable clock oscillator (generally all with crystal oscillator), and oscillator generates
Be sine wave, frequency is not necessarily the clock frequency of circuit work, so this sine wave is divided, handles, is formed
Clock pulses is then dispensed for the place of needs.Use when allowing each section works in system.
Due to the error of manufacturing process, the chip (die) of the different places of same wafer (wafer) can produce clock oscillator
Raw different frequency of oscillation, therefore need to carry out school to the clock signal frequency of clock oscillator when in use before clock oscillator
It is quasi-.How calibrated before chip factory so as to guarantee the accurate of chip clock, is the problem of emphasis of the present invention is inquired into.
Summary of the invention
The object of the present invention is to provide a kind of piece internal clock calibration methods in technical process and calibration circuit, can
Adjustment effectively is automatically corrected to the deviation of clock signal before chip factory, ensure that the accuracy of piece internal clock.
To achieve the above object, in a first aspect, the present invention provides a kind of piece internal clock calibrations in technical process
Method, the calibration method include:
Piece internal clock calibrates circuit and accesses externally input reference clock square-wave signal；
Piece internal clock calibration circuit counts the high level of the reference clock square-wave signal, and shakes simultaneously to inside
The piece clock signal for swinging device generation is counted；
When the quantity of externally input reference clock square-wave signal reaches clock count threshold value, stop the counting, and
Obtain the count value of current slice clock signal；
Compare the count value and the clock count threshold value of piece clock signal；
If the count value of described clock signal is more than or less than the clock count threshold value, internal oscillator is adjusted
Electric current to adjust the calibration control word of internal oscillator, to be calibrated to described internal clock.
Preferably, the method also includes:
Judge whether the number of clock alignment reaches setting calibration number, if not provided, according to calibration side described above
Method carries out clock alignment again.
Preferably, the reference clock square-wave signal is the square-wave signal of standard time clock, in described internal clock calibration electricity
Road is accessed before externally input reference clock square-wave signal, the method also includes:
The clock count threshold value is determined according to the frequency of the standard always.
It is further preferred that the standard time clock is 12MHz clock.
Preferably, the electric current of the adjustment internal oscillator is specifically included with the calibration control word for adjusting internal oscillator:
Frequency error value is determined according to the count value of described clock signal and the clock count threshold value, according to described
Frequency error value adjusts the electric current of the internal oscillator to adjust the calibration control word of internal oscillator.
It is further preferred that the amplitude of accommodation of the electric current of the internal oscillator is directly proportional to the frequency error value.
Second aspect, the school that the embodiment of the invention provides a kind of to realize calibration method described in above-mentioned first aspect
Quasi- circuit, the calibration circuit include: standard clock signal generator, counter, processor, current adjusting device and internal vibration
Swing device；
The standard clock signal generator is used for the calibration circuit output reference clock square-wave signal；
The counter is generated for counting to the reference clock square-wave signal, and to the internal oscillator
Piece clock signal counted；
The processor is used to compare the count value and the clock count threshold value of piece clock signal, if in described
The count value of clock signal is more than or less than the clock count threshold value, generates current modifying signal；
The current adjusting device adjusts the electric current of internal oscillator according to the current modifying signal to adjust internal vibration
The calibration control word of device is swung, to calibrate to described internal clock.
Preferably, the processor is also used to judge whether the number of clock alignment reaches setting calibration number, if do not had
Have, then carries out clock alignment again.
Preferably, the processor is specifically used for, according to the count value of described clock signal and the clock count
Threshold value determines frequency error value, adjusts the electric current of the internal oscillator according to the frequency error value to adjust internal oscillator
Calibration control word.
It is further preferred that the amplitude of accommodation of the electric current of the internal oscillator is directly proportional to the frequency error value.
Piece internal clock calibration method provided in an embodiment of the present invention in technical process, by with external reference clock
It compares, adjustment electric current is adjusted come the calibration control word to oscillator, so as to realize before chip dispatches from the factory to piece
The automatic calibration of internal clock, ensure that the accuracy of piece internal clock.This method is simple and easy, is suitable for industrialization and uses.
Detailed description of the invention
Fig. 1 is the method flow diagram provided in an embodiment of the present invention for the piece internal clock calibration method in technical process；
Fig. 2 is the logical schematic of the calibration of provided in an embodiment of the present invention internal clock；
Fig. 3 is the schematic diagram of calibration circuit provided in an embodiment of the present invention.
Specific embodiment
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
The piece internal clock calibration method being used in technical process of the invention, can be used for chip and is checked before factory
When clock alignment.
Fig. 1 is the flow chart provided in an embodiment of the present invention for the piece internal clock calibration method in technical process, such as Fig. 1
Shown, this method is executed essentially according to following steps.
Step 110, piece internal clock calibration circuit accesses externally input reference clock square-wave signal；
Specifically, will use standard time clock as reference clock, usually selection 12MHz in the calibration of performing chip internal clock
Clock.Before piece internal clock calibration circuit accesses externally input reference clock square-wave signal, frequency of the meeting according to standard always
Rate determines clock count threshold value.For 12Mhz clock, which is equal to 65536.
In the present embodiment, we are counted using the high level of square-wave signal.
Step 120, piece internal clock calibration circuit counts the high level of reference clock square-wave signal, and simultaneously internally
The piece clock signal that portion's oscillator generates is counted；
Specifically, counting to the high level of reference clock square-wave signal, accurate count value is obtained, that is, is used for conduct
The count value of benchmark.The piece clock signal generated to internal oscillator counts, and obtained count value is actual inside vibration
The count value that device is generated with current oscillating frequency is swung, when the frequency of internal oscillator shifts, which also can be corresponding
Generation variation.This count value is exactly the reference frame for carrying out internal oscillator frequency adjustment.
Step 130, when the quantity of externally input reference clock square-wave signal reaches the clock count threshold value, stop
The counting, and obtain the count value of current slice clock signal；
Step 140, compare the count value and clock count threshold value of piece clock signal；
If under the count value and clock count threshold value unanimous circumstances that compare piece clock signal, it is believed that piece internal clock is
Accurately, without to internal oscillator making frequency adjustment.Otherwise calibration process is executed according to step 150.
Step 150, as the count value of chankings clock signal is more than or less than clock count threshold value, adjustment internal oscillator
Electric current to adjust the calibration control word of internal oscillator, to be calibrated to piece internal clock.
Specifically, being provided with calibration control word, the current or voltage inside adjustable oscillator in clock oscillator
Realize the adjustment of oscillator frequency, which stores in circuit in digital form, when controlling clock frequency by control word
Corresponding analog quantity is converted into control the clock signal frequency of clock oscillator.The size of control word and clock oscillator when
Clock signal frequency is in monotonic increasing function relationship, i.e. control word is bigger, and the clock signal frequency of corresponding clock oscillator is higher.
Therefore, frequency error value can be determined according to the count value and clock count threshold value of piece clock signal, according to frequency error value
It is controlled in the adjustment present invention to generate the electric current of the internal oscillator of internal clock signal with the calibration for adjusting internal oscillator
Word.In a concrete implementation, the amplitude of accommodation of the electric current of internal oscillator is directly proportional to frequency error value.
Step 160, judge whether the number of clock alignment reaches setting calibration number；
Specifically, can be set for repeatedly calibrating for the accuracy of calibration.Calibration number is preset, and to
Calibration number through completing is counted.Calibration number is preset when reaching, it is believed that calibration is completed, and terminates calibration, if do not had
Have, return step 110 continues to calibrate.
Calibration method of the invention is illustrated with specific application example below.
Product inputs standard 12MHz clock when leaving the factory, in specified chip pin (pin), chip interior to it is external when
Clock count 65536 times, while in this period to internal clock count, when the counting to external clock stops, record
The count value of internal clocking at this time, if it is greater than 65536, the electric current for proportionally adjusting internal oscillator reduces frequency, if
Less than 65536, the electric current for proportionally adjusting internal oscillator increases frequency.It is 8 times that calibration number, which can be set, is passed through 8 times
The above process completes clock alignment function.The logic of the calibration of the piece internal clock of the present embodiment is as shown in Figure 2.
Correspondingly, the calibration circuit that the embodiment of the invention also provides a kind of to realize above-mentioned calibration method, comprising: mark
Clock signal generator 1, counter 2, processor 3, current adjusting device 4 and internal oscillator 5；
Standard clock signal generator 1 is used for the calibration circuit output reference clock square-wave signal；
Counter 2 is used to count reference clock square-wave signal, and to the piece internal clock that internal oscillator 5 generates
Signal is counted；
Processor 3 is used to compare the count value and clock count threshold value of piece clock signal, such as chankings clock signal
Count value is more than or less than clock count threshold value, generates current modifying signal；
Specifically, processor 3 determines frequency error value, root according to the count value and clock count threshold value of piece clock signal
The calibration control word of internal oscillator is adjusted according to the electric current of frequency error value adjustment internal oscillator.Preferably, internal oscillator
The amplitude of accommodation of the electric current of device is directly proportional to frequency error value.
Current adjusting device 4 adjusts the electric current of internal oscillator according to current modifying signal to adjust the school of internal oscillator
Quasi- control word, to be calibrated to piece internal clock.
Processor 3 be also used to judge the number of clock alignment whether reach setting calibration number, if it is not, again into
Row clock calibration.
Processor 3 is specifically used for, and determines frequency error value according to the count value of piece clock signal and clock count threshold value,
The electric current of internal oscillator is adjusted according to frequency error value to adjust the calibration control word of internal oscillator.
Piece internal clock calibration method provided in an embodiment of the present invention in technical process, by with external reference clock
It compares, adjustment electric current is adjusted come the calibration control word to oscillator, thus when realizing before chip factory in piece
The automatic calibration of clock, ensure that the accuracy of piece internal clock.This method is simple and easy, is suitable for industrialization and uses.
Professional should further appreciate that, described in conjunction with the examples disclosed in the embodiments of the present disclosure
Unit and algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, hard in order to clearly demonstrate
The interchangeability of part and software generally describes each exemplary composition and step according to function in the above description.
These functions are implemented in hardware or software actually, the specific application and design constraint depending on technical solution.
Professional technician can use different methods to achieve the described function each specific application, but this realization
It should not be considered as beyond the scope of the present invention.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can be executed with hardware, processor
The combination of software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only memory
(ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field
In any other form of storage medium well known to interior.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention
Protection scope, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (10)
1. a kind of piece internal clock calibration method in technical process, which is characterized in that the calibration method includes:
Piece internal clock calibrates circuit and accesses externally input reference clock square-wave signal；
Piece internal clock calibration circuit counts the high level of the reference clock square-wave signal, and simultaneously to internal oscillator
The piece clock signal of generation is counted；
When the quantity of externally input reference clock square-wave signal reaches clock count threshold value, stop the counting, and obtain
The count value of current slice clock signal；
Compare the count value and the clock count threshold value of piece clock signal；
If the count value of described clock signal is more than or less than the clock count threshold value, the electricity of internal oscillator is adjusted
Stream is to adjust the calibration control word of internal oscillator, to calibrate to described internal clock.
2. calibration method according to claim 1, which is characterized in that the method also includes:
Judge whether the number of clock alignment reaches setting calibration number, if not provided, school according to claim 1 above
Quasi- method carries out clock alignment again.
3. calibration method according to claim 1, which is characterized in that the reference clock square-wave signal is standard time clock
Square-wave signal, before described internal clock calibration circuit accesses externally input reference clock square-wave signal, the method is also
Include:
The clock count threshold value is determined according to the frequency of the standard always.
4. calibration method according to claim 3, which is characterized in that the standard time clock is 12MHz clock.
5. calibration method according to claim 1, which is characterized in that the electric current of the adjustment internal oscillator is interior to adjust
The calibration control word of portion's oscillator specifically includes:
Frequency error value is determined according to the count value of described clock signal and the clock count threshold value, according to the frequency
Error amount adjusts the electric current of the internal oscillator to adjust the calibration control word of internal oscillator.
6. calibration method according to claim 5, which is characterized in that the amplitude of accommodation of the electric current of the internal oscillator with
The frequency error value is directly proportional.
7. a kind of calibration circuit to realize any calibration method of the claims 1-6, which is characterized in that the school
Quasi- circuit includes: standard clock signal generator, counter, processor, current adjusting device and internal oscillator；
The standard clock signal generator is used for the calibration circuit output reference clock square-wave signal；
The counter is used to count the reference clock square-wave signal, and to the piece that the internal oscillator generates
Clock signal is counted；
The processor is used to compare the count value and the clock count threshold value of piece clock signal, if described internal clock
The count value of signal is more than or less than the clock count threshold value, generates current modifying signal；
The current adjusting device adjusts the electric current of internal oscillator according to the current modifying signal to adjust internal oscillator
Calibration control word, to be calibrated to described internal clock.
8. calibration circuit according to claim 7, which is characterized in that the processor is also used to judge time of clock alignment
Whether number reaches setting calibration number, if it is not, carrying out clock alignment again.
9. calibration circuit according to claim 7, which is characterized in that the processor is specifically used for, according in described
The count value of clock signal and the clock count threshold value determine frequency error value, described interior according to frequency error value adjustment
The electric current of portion's oscillator is to adjust the calibration control word of internal oscillator.
10. calibration circuit according to claim 9, which is characterized in that the amplitude of accommodation of the electric current of the internal oscillator
It is directly proportional to the frequency error value.
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| CN201910739666.1A CN110365335A (en) | 2019-08-12 | 2019-08-12 | A kind of piece internal clock calibration method in technical process and calibration circuit |
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| CN201910739666.1A CN110365335A (en) | 2019-08-12 | 2019-08-12 | A kind of piece internal clock calibration method in technical process and calibration circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113935451A (en) * | 2021-11-16 | 2022-01-14 | 宁波奥克斯电气股份有限公司 | Air conditioner clock correction method and air conditioner test equipment |
| CN114257239A (en) * | 2021-11-25 | 2022-03-29 | 苏州浪潮智能科技有限公司 | Method and system for calibrating internal oscillation of programmable logic chip |
| CN115202183A (en) * | 2022-07-21 | 2022-10-18 | Oppo广东移动通信有限公司 | Clock calibration method and device for sensor, storage medium and electronic equipment |
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| CN113935451A (en) * | 2021-11-16 | 2022-01-14 | 宁波奥克斯电气股份有限公司 | Air conditioner clock correction method and air conditioner test equipment |
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Application publication date: 20191022 |