KR102100034B1 - System and method for measuring mipi speed - Google Patents

Abstract

The present invention relates to a method and system for measuring MIPI speed. The method for measuring MIPI speed according to an embodiment of the present invention comprises: setting a reference time, counting the number of clocks of a MIPI signal during a reference time, and counting the reference time And calculating the speed of the MIPI signal using the number of clocks of the MIPI signal.

Description

MIP speed measuring system and method {SYSTEM AND METHOD FOR MEASURING MIPI SPEED}

The present invention relates to a system and method for measuring MIPI speed. More specifically, it relates to a system and method for accurately measuring MIPI speed using a system clock.

Today, image sensors and packaged camera modules are one of the main components installed in mobile terminals, and components constituting mobile terminals such as displays are becoming more and more highly specified.

Accordingly, cooperation for a proper interface between various functions and high-performance components is required, and MIPI (Mobile Industry Processor Interface) was established as a standard for defining an interface between each component constituting such a mobile device. .

As disclosed in Korean Patent Registration No. 10-1193057, an image sensor used in a mobile terminal is a MIPI sensor using a MIPI interface established as a standard, and MIPI Camera Serial Interface (CSI-2) is a camera and a mobile terminal. It is the industry's most widely used hardware interface for deploying imaging components.

On the other hand, components such as sensors used in the mobile terminal must be configured according to specifications that the board can support, so it is necessary to measure MIPI speed to check whether the board is a sensor that can be supported.

However, the method of measuring the MIPI speed directly with a scope, which is a method currently used to measure the MIPI speed, has a problem that it is difficult to accurately measure the MIPI speed with the scope because the signal quality deteriorates as soon as the scope is contacted.

Moreover, the current sensor's MIPI speed is up to 1GHz (2Gbps), and it is expected to develop to 1.5GHz (3Gbps) in the future. Therefore, it is necessary to develop a method to accurately measure MIPI speed.

An object of the present invention is to provide a system and method for measuring MIPI speed.

Another object of the present invention is to provide a system and method capable of measuring MIPI speed without using a scope.

Another object of the present invention is to provide a system and method for measuring MIPI speed using a system clock.

Another object of the present invention is to provide a system and method for measuring MIPI speed that can minimize errors that may occur by simultaneously measuring the number of system clocks and the number of MIPI clocks in LPS cycles in the same time zone.

Another object of the present invention is to provide a MIPI speed measurement system and method capable of minimizing errors that may occur by selecting and using a clock value of a MIPI signal divided by an optimal divider among a plurality of dividers.

The above and other objects of the present invention can be achieved by the MIPI speed measurement system and method according to the present invention.

MIPI rate measurement method according to an embodiment of the present invention, setting a reference time; Counting the number of clocks of the MIPI signal during the reference time; And calculating the speed of the MIPI signal using the reference time and the number of clocks of the counted MIPI signal.

Counting the number of clocks of the MIPI signal may include dividing the MIPI signal using a divider and counting the number of clocks in the divided MIPI signal.

In addition, calculating the speed of the MIPI signal may calculate the speed of the MIPI signal using the reference time, the divider ratio of the divider, and the number of clocks of the divided MIPI signal.

In the step of dividing the MIPI signal, dividing the MIPI signal using a plurality of dividers dividing the MIPI signal at different dividing ratios, and counting the number of clocks in the divided MIPI signal include dividing the dividing ratio into different dividing ratios. The number of clocks of each of the MIPI signals may be counted, and the step of calculating the speed of the MIPI signal may determine the most reliable number of clocks according to a preset criterion among the clocks in a plurality of MIPI signals divided by different division ratios. Determine and calculate the speed of the MIPI signal using the reference time, the most reliable clock number, and the divider ratio of the divider corresponding to the most reliable clock number.

The preset reference is a range in which the number of clocks in the MIPI signal divided by each divider is preset based on the number of clocks in the MIPI signal divided by the divider that divides the MIPI signal at the largest ratio among the plurality of dividers. It may be to determine whether it exists within, and the number of clocks of the MIPI signal divided by the divider that divides the MIPI signal at the smallest ratio among the number of clocks existing in a preset range may be determined as the most reliable clock number.

In the setting of the reference time, an arbitrary reference time may be set using a system clock.

The setting of the reference time may include counting the number of clocks of the system clock, and calculating the speed of the MIPI signal may include a speed of a known system clock and the system clock counted for the same time. MIPI speed may be calculated using the number of clocks and the number of clocks of the MIPI signal.

In addition, the reference time can be calculated by counting the number of system clocks during one cycle of MIPI LPS, and counting the number of clocks of the MIPI signal is the same as the MIPI LPS one cycle of counting the number of system clocks. During the period, the number of clocks of the MIPI signal can be counted.

MIPI speed measurement system according to an embodiment of the present invention includes a receiving unit for receiving a MIPI signal; A MIPI counter for counting the number of clocks of the MIPI signal received through the receiver; A reference time setting unit for setting a reference time; And an operation unit calculating a speed of the MIPI signal by using the reference time and the number of clocks of the MIPI signal counted during the reference time by the MIPI counter.

In addition, the MIPI speed measurement system according to an embodiment of the present invention may further include a divider for dividing the MIPI signal received through the receiver and providing the MIPI counter.

The divider may be composed of a plurality of dividers that divide the received MIPI signals at different division ratios, and the MIPI counter may include a plurality of MIPIs that count the number of clocks of the plurality of divided MIPI signals divided by the plurality of dividers, respectively. The counter may include a counter, and the calculation unit may include the most reliable clock number, a divider ratio of the divider corresponding to the most reliable clock number, and the reference number based on a preset criterion among clock numbers counted by a plurality of MIPI counters. The speed of the MIPI signal can be calculated using time.

The preset reference is a range in which the number of clocks in the MIPI signal divided by each divider is preset based on the number of clocks in the MIPI signal divided by the divider that divides the MIPI signal at the largest ratio among the plurality of dividers. The number of MIPI signals divided by the divider that divides the MIPI signal at the smallest ratio among the clock numbers existing in a preset range may be determined as the most reliable clock number. .

The reference time setting unit may include a system counter that counts the number of clocks of the system clock.

Also, the reference time setting unit may receive the MIPI signal from the receiving unit and set the reference time in a section in which the clock signal of the MIPI signal is continuously input.

In addition, the reference time setting unit sets a reference time by counting the number of system clocks during one period of the MIPI LPS, and the MIPI counter counts the number of MIPI clocks during one period of the same MIPI LPS by which the reference time setting unit counts the number of system clocks. You can.

The MIPI speed measurement system and method according to the present invention provides an effect of measuring MIPI speed without using a scope.

In addition, it provides a system and method for measuring MIPI speed using a system clock, and minimizes errors that can occur by measuring the number of system clocks and the number of MIPI clocks in the same section. It provides an effect of minimizing the error that can occur by using the clock value of the signal divided by.

1 is an exemplary waveform diagram of a continuous mode MIPI signal.
2 is a system configuration diagram of a MIPI speed measurement system according to an embodiment of the present invention.
3 is a flowchart of a MIPI speed measurement method according to an embodiment of the present invention.
4 is a system configuration diagram of a MIPI speed measurement system according to another embodiment of the present invention.
5 is a view showing a clock signal divided by the divider.
6 is a system configuration diagram of a MIPI speed measurement system according to another embodiment of the present invention.
7 is a flowchart of a MIPI speed measurement method according to another embodiment of the present invention.
8 is an exemplary clock signal waveform diagram of a discontinuous mode MIPI signal.
9 is a system configuration diagram of a MIPI speed measurement system according to another embodiment of the present invention.
10 is a flowchart of a MIPI rate measurement method according to another embodiment of the present invention.

Hereinafter, the MIPI speed measurement system and method according to the present invention will be described in detail with reference to the accompanying drawings.

In the following description, only the parts necessary to understand the MIPI speed measurement system and method according to the embodiment of the present invention are described, and descriptions of other parts may be omitted so as not to distract the subject matter of the present invention.

In addition, the terms or words used in the specification and claims described below should not be interpreted as being limited to a conventional or lexical meaning, and are meant to conform to the technical spirit of the present invention so as to best represent the present invention. And should be interpreted as a concept.

Throughout the specification, when a part “includes” a certain component, it means that the component may further include other components, not to exclude other components, unless otherwise stated. In addition, terms such as “… unit”, “… group”, and “module” described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. have.

In various embodiments, components having the same configuration are typically described in one embodiment by using the same reference numerals, and in other embodiments, a configuration different from the embodiment will be described.

1 shows an exemplary waveform diagram of a MIPI signal.

Referring to FIG. 1, the MIPI signal is a data lane and a data signal is transmitted while two modes of a low power (LP) mode and a high speed data (HS) mode are mixed and changed through a data lane. lane) to transmit the clock signal.

The speed of the MIPI signal (also referred to as frequency or frequency) can be measured by counting the number of clocks of the MIPI signal for a certain period of time.

To this end, the MIPI speed measurement system 100-1 according to an embodiment of the present invention includes a receiver 10, a MIPI counter 20, a calculator 30 and a reference time generator 40 as shown in FIG. It is made including.

The reception unit 10 receives a signal (MIPI signal) according to the MIPI communication interface from components constituting a mobile terminal, for example, an image sensor.

The MIPI counter 20 counts the number of clocks of the MIPI signal received by the receiver 10, that is, the number of clocks of the clock signal included in the MIPI signal.

The calculating unit 30 calculates the speed of the MIPI signal received by the receiving unit using the number of clocks counted by the MIPI counter during the reference time. For example, if 10 ⁶ clocks are received during the reference time 1S (seconds), the speed of the MIPI signal is calculated as 1 GHz.

The operation unit 30 may control the MIPI counter to start counting the clock number of the clock signal by sending an enable signal for the MIPI counter to start counting the clock number of the clock signal, and when the reference time is reached By sending a reset signal to the MIPI counter, the MIPI counter can be controlled to reset the count of clock numbers of the clock signal, and the result of counting during the reference time can be received to calculate the speed of the MIPI signal.

The reference time generator 40 generates a reference time for calculating the MIPI rate and provides it to the calculator 30.

To this end, the reference time generation unit may include a timer, for example. The timer may be configured to provide an end signal that the reference time has been reached when the set reference time is reached after the start signal is received from the operation unit 30.

At this time, the operation unit may simultaneously generate and send an enable signal to be sent to the MIPI counter 20 and a start signal to be sent to the reference time generator 40, and when an end signal is received from the reference time generator 40, MIPI counter until then The MIPI rate can be calculated from the number of clocks of the MIPI signal counted by and a reset signal is sent to the MIPI counter to reset the MIPI counter.

In addition, the reference time generation unit 40 may include a system counter that counts the number of clocks of the system clock. The system clock signal may be input to the reference time generator including the system counter to generate the reference time, and the clock of the system clock at the same time (i.e., simultaneous) as the MIPI counter 20 counts the number of clocks of the MIPI signal. The number may be calculated and provided to the calculation unit 30.

To this end, the calculator sends an enable signal to the MIPI counter 20 and the system counter at the same time to start counting clocks, and calculates the MIPI speed using the clock count of the MIPI signal counted during the same time and the clock count of the system clock. It can be configured to. That is, when the number of clocks of the system clock counted during the same time is 100 and the number of clocks of the MIPI signal is 1000, it is possible to calculate that the MIPI speed is 1 GHz by using the known system clock speed (for example, 100 MHz).

As described so far, the MIPI speed measurement system 100-1 according to an embodiment of the present invention includes a receiver 10, a MIPI counter 20, a calculator 30 and a reference time generator 40 The MIPI rate measurement method using the MIPI rate measurement system according to an embodiment of the present invention is as illustrated in FIG. 3.

Hereinafter, the MIPI speed measurement method according to an embodiment of the present invention will be described with reference to the flowchart shown in FIG. 3, but the blocks of the career shown in FIG. 3 are shown for simple description, and the present invention is shown in FIG. It is not limited to the order of blocks, but some blocks may occur in different orders or simultaneously with other blocks in a different order than described and described herein, and of various other branches, flow paths, and blocks that achieve the same or similar results. Sequences can be implemented. In addition, it will be understood that not all blocks shown may be required for implementation of the methods described herein.

Referring to FIG. 3, the MIPI speed measurement system according to an embodiment of the present invention includes a reference time setting step (S100), a MIPI signal clock count count step (S200), and a MIPI speed calculation step (S300). The MIPI rate can be measured.

In more detail, the reference time is set by the reference time generator 40 (S100), the MIPI counter 20 counts the number of clocks of the MIPI signal during the set reference time (S200), and the calculator 30 Using the reference time and the counted number of MIPI signal clocks, the speed of the MIPI signal is calculated using Equation 1 below (S300).

[Equation 1]

MIPI rate = reference time / number of MIPI signal clocks counted during the reference time

In this case, the reference time can be set using a system clock that already knows the speed.

In more detail, the reference time setting step (S100) may include counting the number of clocks of the system clock, and the same time as counting the number of clocks of the system clock in the counting step of the MIPI signal clock number (S200). While counting the number of clocks of the system clock and counting the number of clocks of the MIPI signal, the speed of the MIPI signal may be calculated using Equation 2 below in the MIPI speed calculation step S300.

[Equation 2]

MIPI speed = (number of clocks of MIPI signal counted during the same time / number of clocks of system clock counted during the same time) × system clock speed

On the other hand, it is not easy to accurately count the number of clocks of MIPI signals above 1 GHz as a general counter, and accordingly, if an error occurs in the number of clocks of MIPI signals counted by the MIPI counter, it is impossible to measure the correct MIPI speed.

To this end, the MIPI speed measurement system 100-2 according to another embodiment of the present invention includes a receiver 10, a MIPI counter 20, a calculator 30, and a reference time generator 40 as shown in FIG. And a divider 50.

MIPI speed measurement system 100-2 according to another embodiment of the present invention shown in Figure 4, except for further comprising a divider 50 MIPI speed according to an embodiment of the present invention shown in Figure 2 described above Since it is the same as the measurement system 100-1, descriptions of the receiver 10, MIPI counter 20, arithmetic unit 30, and reference time generator 40 that are commonly included are replaced with the previous description, and the divider ( The MIPI speed measurement system according to another embodiment of the present invention will be mainly described with reference to 50).

The divider 50 is located between the receiver 10 and the MIPI counter 20 as shown in FIG. 4 to divide the MIPI signal from the receiver 10 and provide it to the MIPI counter.

The divider may divide a clock signal having a predetermined period as shown in FIG. 5. That is, when a clock signal of 1 GHz is input to a divider (DIV2) having a division ratio of 1/2, it is output as a clock signal of 500 MHz.

Accordingly, the MIPI counter receiving the divided MIPI signal through such a divider can accurately count the number of clocks than receiving the undivided MIPI signal and counting the clocks, and the operation unit 30 is another embodiment of the present invention. By using the division ratio (1 / n) information of the divider (DIVn) used in the MIPI speed measurement system 100-2 according to Equation 3, the number of clocks of the undivided MIPI signal can be estimated ( n is the power of 2).

[Equation 3]

Number of clocks of undivided MIPI signals = (Number of clocks of MIPI signals divided by a divider with a division ratio of 1 / n) x n

If a MIPI counter that counts the number of clocks of a MIPI signal that is expected to have a speed of 2 GHz can measure a clock signal of up to 800 MHz, a divider that reduces the speed of the MIPI signal to less than 800 (for example, 1/4 division ratio) It is desirable to reduce the speed of the MIPI signal to less than 800MHz by using a divider (DIV4).

In particular, considering the fact that it is difficult to predict the speed of the MIPI signal input to the input unit and count the number of clocks of the clock signal of up to 800 MHz, it is often impossible to count the clock signal of 800 MHz without error. It is preferable to use a divider (where the value of = n is large).

However, the larger the divider ratio is used, the more accurately the clock number of the divided clock signal can be measured, but the higher the probability that the error signal included in the undivided clock signal is not reflected in the divided clock signal.

Accordingly, the MIPI signal measurement system 100-3 according to another embodiment of the present invention includes a plurality of dividers and a plurality of MIPI counters that count the number of clocks of signals divided by each divider as shown in FIG. You can increase the accuracy of your MIPI speed measurement by configuring it to include and choosing the most reliable clock count.

The MIPI signal measurement system 100-3 according to another embodiment of the present invention includes a receiver 10, a plurality of dividers 50, a plurality of MIPI counters 20, and an arithmetic unit 30 as shown in FIG. ), And a reference time generator 40.

The MIPI speed measurement system 100-3 according to another embodiment of the present invention shown in FIG. 6 includes the plurality of dividers 50 and MIPI counters 20, but the present invention shown in FIG. 4 described above Since it is the same as the MIPI speed measurement system 100-2 according to another embodiment of the present disclosure, a description will be given of a MIPI speed measurement system according to another embodiment of the present invention, focusing on a plurality of dividers 50 and a plurality of MIPI counters. I will do it.

6, the MIPI speed measurement system according to another embodiment of the present invention includes a plurality of dividers (50-1, 50-2, ..., 50-n), a plurality of dividers and 1 A plurality of MIPI counters corresponding to 1 are connected to each divider to count the number of clocks of MIPI signals divided by each divider.

At this time, the plurality of dividers have different division ratios, and the MIPI signals are divided and output at different ratios, and the MIPI counter connected to each divider counts the number of clocks of the divided MIPI signals.

The calculating unit 30 receives the number of clocks counted by each MIPI counter during the reference time and calculates the MIPI rate using the most reliable clock number.

At this time, the criterion for selecting the most reliable clock number is a reference divider among a plurality of dividers, and based on the number of clocks of signals divided by the reference dividers, the number of clocks of MIPI signals divided by each divider is within a preset range. You can decide if you exist.

In more detail, for example, as illustrated in FIG. 7, a reference divider is provided when the MIPI speed measurement system 5 dividers (DIV2, DIV4, DIV8, DIV16, DIV32) according to another embodiment of the present invention are provided. DIV32 can be the largest dispensing ratio. This is because the result of counting the signal of the DIV32 that divides the MIPI signal at the largest ratio when counting with the same performance counter is the most accurate.

Accordingly, it is determined whether the number of clocks of the MIPI signal divided by each divider is within a preset normal range based on the number of clocks of the MIPI signal divided by the DIV32 divider.

That is, when there is no error in the result value counted by the counter, when the number of clocks of the MIPI signal divided by the DIV32 divider is N, the number of clocks of the MIPI signal divided by the DIV16 divider must be 2N, so Equation 4 below is used. By doing so, it is possible to determine whether the result value counted by each count is correct.

[Equation 4]

(Number of clocks of the reference divider × n / n1) -1 <Count result <(Number of clocks of the reference divider × n / n1) +1

Where n is the reciprocal of the division ratio of the reference divider, n1 is the reciprocal of the division ratio of each divider, and ± 1 is any allowable error range.

Therefore, when the clock number of the MIPI signal divided by the DIV32 divider counted during the reference time is 312.5, the reciprocal of the division ratio of DIV32 is 32, and the reciprocal of the division ratio of DIV16 is 16, so the MIPI divided by the DIV16 divider counted during the reference time When the number of clock signals is between 624 and 626, the number of clocks counted during the reference time for the MIPI signal divided by DIV16 can be determined as the correct number of clocks.

In this way, the operation unit determines whether the number of clocks counted during the reference time of each MIPI counter connected to all the dividers such as DIV2, DIV4, and DIV8 dividers is within a preset range, and divides ratio among clocks within the preset range (1 The number of clocks of the MIPI signal divided by the divider having the smallest (n value) is determined as the most reliable clock number. This is because, as described above, the MIPI signal divided by the divider having the smallest dispensing ratio accurately reflects the clock characteristics of the MIPI signal before dispensing without generating an error in the dispensing process.

Therefore, when the result value of counting the number of clocks of the MIPI signals divided by all the dividers (DIV2, DIV4, DIV8, and DIV16) is within a normal range set based on the reference divider (DIV32), the clock of the MIPI signal divided by DIV2 The number is determined as the most reliable clock number, and the calculator can estimate the number of clocks of the undivided MIPI signal during the reference time using Equation 3 and calculate the MIPI rate using the number of clocks.

Meanwhile, there are two clock modes in the signal transmission method using MIPI. As shown in FIG. 1, continuous mode in which a clock signal is always input (Continuous mode) and actual packet data is not transmitted as shown in FIG. During the low power state (LPS) section, there is a non-continuous mode in which a clock signal is not output.

Therefore, when the reference time is arbitrarily set, a clock signal may not be continuously input for a set reference time, which may cause an incorrect count of clocks.

Accordingly, the MIPI signal measurement system 100-4 according to another embodiment of the present invention receives the MIPI signal input to the receiving unit 10 as shown in FIG. 9, and the reference time is only in a section in which the clock signal is continuously input. By setting, you can increase the accuracy of MIPI speed measurement.

As illustrated in FIG. 9, the MIPI signal measurement system 100-4 according to another embodiment of the present invention includes a receiver 10, a plurality of dividers 50, a plurality of MIPI counters 20, and a calculator 30 ), And the reference time generation unit 40, and this embodiment is composed of the same components as the embodiment 100-3 shown in FIG. 6, but the reference time generation unit 40 includes a reception unit 10 ) And is configured to receive MIPI signals from the receiver. Therefore, hereinafter, the reference time generator sets the reference time in detail with reference to the MIPI signal.

The reference time generation unit 40 of the MIPI signal measurement system 100-4 according to another embodiment of the present invention receives the MIPI signal from the reception unit 10 and determines the reference time only in a section in which the MIPI clock signal is continuously received. Set.

As described above, the clock signal is not output during the LPS period in the discontinuous mode. Therefore, the reference time generator sets a reference time in a section other than the LPS.

To this end, the LPS signal is separated from the MIPI signal input to the receiver, and as shown in FIG. 10, after one LPS signal is input, until the next LPS signal is input, that is, the system clock for one MIPI LPS cycle (LPS cycle) The reference time can be set by counting the number.

In this case, since the interval of the MIPI LPS section in the MIPI signal is not always the same, when counting the number of system clocks during one LPS period is 30, counting the number of system clocks during another LPS period may be 31.

Accordingly, the MIPI signal measurement system 100-4 according to another embodiment of the present invention is configured to allow the MIPI counter to simultaneously count the number of MIPI clocks during one MIPI LPS cycle, in which the reference time generator counts the number of system clocks. MIPI LPS By counting the number of clocks in one cycle, more accurate MIPI speed can be measured.

At this time, the calculation unit may calculate the MIPI rate using Equation 2 described above, and determine the most reliable clock number using a plurality of dividers having different division ratios as shown in FIG. 10 to determine the MIPI rate. By measuring, more accurate MIPI speed can be measured.

So far, the MIPI speed measurement system and method according to an embodiment of the present invention have been described with reference to specific embodiments. However, it is to be understood that the present invention is not limited to these specific embodiments, and various changes and changes can be made without departing from the spirit and scope of the invention claimed in the claims.

10: receiver 20: MIPI counter
30: calculation unit 40: reference time generation unit
50: Divider 100: MIPI speed measurement system

Claims (14)

Setting a reference time;
Counting the number of clocks of the MIPI signal during the reference time; And
Calculating a speed of the MIPI signal using the reference time and the number of clocks of the counted MIPI signal;
Including,
Counting the number of clocks of the MIPI signal is
Dividing the MIPI signal using a divider; And
Counting the number of clocks in the divided MIPI signal;
Including,
The step of calculating the speed of the MIPI signal is to calculate the speed of the MIPI signal using the reference time, the divider ratio of the divider, and the number of clocks of the divided MIPI signal. delete According to claim 1,
The step of dividing the MIPI signal divides the MIPI signal using a plurality of dividers for dividing the MIPI signal at different division ratios,
Counting the number of clocks in the divided MIPI signal counts the number of clocks of each of the plurality of MIPI signals divided by different division ratios,
The step of calculating the speed of the MIPI signal is
Determining a most reliable clock number according to a preset criterion among clock numbers in a plurality of MIPI signals divided by different division ratios; And
MIPI speed measurement method characterized in that for calculating the speed of the MIPI signal using the reference time, the most reliable clock number, and the divider ratio of the divider corresponding to the most reliable clock number. According to claim 3,
The preset reference is a range in which the number of clocks in the MIPI signal divided by each divider is preset based on the number of clocks in the MIPI signal divided by the divider that divides the MIPI signal at the largest ratio among the plurality of dividers. MIPI, characterized in that the most reliable clock number is the number of clocks of a MIPI signal divided by a divider that divides the MIPI signal at the smallest ratio among the clock numbers existing in a preset range. Speed measurement method. The method according to any one of claims 1, 3, and 4,
The step of setting the reference time is a method for measuring MIPI speed, characterized in that an arbitrary reference time is set using a system clock. The method of claim 5,
The setting of the reference time includes counting the number of clocks of the system clock,
The step of calculating the speed of the MIPI signal is a MIPI speed characterized by calculating a MIPI speed using a known system clock speed, the number of clocks of the system clock counted for the same time, and the number of clocks of the MIPI signal. How to measure. The method of claim 6,
The reference time is calculated by counting the number of system clocks during one cycle of MIPI LPS,
The step of counting the number of clocks of the MIPI signal is characterized in that the number of system clocks is counted for one period of MIPI LPS equal to one period of the MIPI LPS counting the number of system clocks and the number of clocks of the MIPI signal is counted. MIPI speed measurement method. A receiver for receiving the MIPI signal;
A divider for dividing the MIPI signal received through the receiver and providing it to the MIPI counter;
A MIPI counter for counting the number of clocks of the MIPI signal divided by the divider;
A reference time setting unit for setting a reference time; And
An operation unit calculating a speed of the MIPI signal by using the clock number and the reference time of the divided MIPI signal counted during the reference time by the MIPI counter;
MIPI speed measurement system comprising a. delete The method of claim 8,
The divider is composed of a plurality of dividers that divide the received MIPI signal at different division ratios,
The MIPI counter consists of a plurality of MIPI counters that count the number of clocks of the plurality of divided MIPI signals divided by the plurality of dividers,
The operation unit may use the MIPI by using the most reliable clock number, the divider ratio of the divider corresponding to the most reliable clock number, and the reference time according to a preset criterion among clock numbers counted by a plurality of MIPI counters. MIPI speed measurement system characterized by calculating the speed of the signal. The method of claim 10,
The preset reference is a range in which the number of clocks in the MIPI signal divided by each divider is preset based on the number of clocks in the MIPI signal divided by the divider that divides the MIPI signal at the largest ratio among the plurality of dividers. It is to determine whether it exists within, and the calculating unit determines that the clock number of the MIPI signal divided by the divider that divides the MIPI signal at the smallest ratio among the clock numbers existing in the preset range is the most reliable clock number. Features MIPI speed measurement system. The method of any one of claims 8, 10, and 11,
The reference time setting unit MIPI speed measurement system comprising a system counter for counting the number of clocks of the system clock. The method of claim 12,
The reference time setting unit receives the MIPI signal from the receiving unit, MIPI speed measurement system, characterized in that for setting the reference time in a section in which the clock signal of the MIPI signal is continuously input. The method of claim 13,
The reference time setting unit sets a reference time by counting the number of system clocks during one cycle of MIPI LPS,
The MIPI counter is a MIPI rate measuring system, characterized in that the reference time setting unit counts the number of MIPI clocks during the same MIPI LPS period counting the number of system clocks.

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