JPH01110285A - Data timing control apparatus - Google Patents

Abstract

PURPOSE:To control the timing of the input data of a data converting circuit over a wide range, by providing a length variable delay wire between the output terminal of a data generating circuit and the data converting circuit receiving the output of said circuit. CONSTITUTION:Delay wires 2a, 2b capable of obtaining delay times determined per a unit length are connected between the output terminal of a data generating circuit 1 and the input terminal of a data converting circuit 3. An output judge circuit 4 judges whether there is allowance in each timing of input data with respect to the output of the data converting circuit 3 and a controller 5 is controlled by the output judge circuit 4 to regulate the lengths of the delay wires 2a, 2b and time difference is calculated from said lengths.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a data timing control device, and more particularly to a data timing control device that measures and controls the setup time and hold time of digital input data.

[Conventional technology]

Conventionally, circuits that measure and control the timing of this type of input data use data generators that operate with a basic clock that is much higher than the frequency of the signal used.

FIG. 2 is a block circuit diagram of such an input data timing control device.

As shown in FIG. 2, this timing control device includes a data generation circuit 11 that operates with a high frequency clock, and converts two input data generated by this data generation circuit 11 (for example, a D/A converter). A data conversion circuit 13, an output determination circuit 14 that determines the timing of the output of the data conversion circuit 13, and a control signal 16 that changes the period of pulses in the data generation circuit 11 based on the output of the output determination circuit 14. It is composed of a controller 15 for outputting data. In particular, the output determination circuit 14 determines whether the timing of output after data conversion is within an allowable range, and controls the data generation circuit 11 via the controller 15.

[Problem that the invention seeks to solve]

When the data timing control device described above controls the timing of output data only by the data output timing of the data generation circuit, it basically uses a clock generation circuit that operates at a cycle equal to at least the time resolution and data that operates at that timing. This method requires a generation circuit, which not only makes the control device expensive, but also makes it impossible to perform measurements.

That is, determining the input timing of the data conversion circuit using only the output data timing adjustment function of the data generation circuit described above has the disadvantage that the timing adjustment range cannot be made smaller than the basic clock cycle.

SUMMARY OF THE INVENTION An object of the present invention is to provide a data timing control device that can arbitrarily adjust the timing of input data, that is, can adjust the timing of input data to be larger or smaller than the basic clock cycle.

[Means for Solving the Problems] The data timing control device of the present invention is a data timing control device that measures and controls the time difference between data inputs of a data conversion circuit having two or more high-speed data input terminals. In the apparatus, a delay line capable of obtaining a fixed delay time per unit length is connected between the output terminal of the data generation circuit and the input terminal of the data conversion circuit, and a controller is controlled by an output determination circuit. The length of the delay line is adjusted and the time difference is calculated from the length.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a data timing control device for explaining one embodiment of the present invention.

As shown in FIG. 1, this data timing control device includes a data generation circuit 1 that outputs two input data;
Delay lines 2a and 2b are connected to each of the input data lines and can obtain a fixed delay time per unit length, and the length can be varied, and the output of each delay line is converted. (for example, D/A conversion), an output determination circuit 4 that determines whether or not there is a timing margin for each output of the data conversion circuit 3, and a determination of the output determination circuit 4. A delay line length adjustment signal line 7a controls the clock period and the like of the data generation circuit 1 by the control signal line 6 based on the signal, and adjusts the length of the delay lines 2a and 2b connected to the output of the data generation circuit 1.

The controller 5 is controlled by the controller 7b. Incidentally, as the delay lines 2a and 2b, for example, sliding waveguides can be used, and the length can be changed manually or by a motor drive.

By using a data timing control device with such a configuration, when measuring the time difference in which data can be inputted from a data conversion circuit having two or more high-speed data input terminals, it is possible to use a data timing control device that operates at high speed. The timing of input data can be controlled to be smaller than the basic clock period based on the output determination signal, and in particular, it becomes possible to measure and control the setup time and hold time of digital input data.

The above embodiment uses two types of delay lines, but it is also possible to use coaxial cables of different lengths to obtain different delay times, and to switch between these cables using coaxial relays. This can also be implemented in the same manner as in the previous embodiment.

〔Effect of the invention〕

As explained above, the data timing control device of the present invention includes a delay line whose length can be varied between the output terminal of the data generation circuit and the input terminal of the data conversion device that receives it, and controls this delay line. This has the effect that the timing of input data to the data conversion circuit can be controlled over a wide range. Therefore, by using such a highly accurate control device, an economical data timing measuring device can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram of a data timing control device for explaining an embodiment of the present invention, and FIG. 2 is a block circuit diagram of a data timing control device for explaining a conventional example. 1...Data generation circuit, 2a, 2b...Delay line, 3
...Data conversion circuit, 4...Output judgment circuit, 5...
- Controller, 6... Control signal line, 7. a
, 7b...Delay line length adjustment signal line.

Claims (1)

[Claims] In a data timing control device that measures and controls the time difference between inputtable data of a data conversion circuit having two or more high-speed data input terminals, the output terminal of the data generation circuit and the input terminal of the data conversion circuit are connected to each other. A delay line capable of obtaining a predetermined delay time per unit length is connected between the two, a controller is controlled by an output determination circuit to adjust the length of the delay line, and a time difference is calculated from the length. A data timing control device characterized by: