JPH048750B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of addressing a storage device in a programmable oscilloscope, and more specifically, the present invention relates to a method of addressing a storage device in a programmable oscilloscope. regarding the addressing method.

In this specification, a programmable oscilloscope refers to the selection of channels necessary for waveform display on the oscilloscope itself, the setting of trigger modes, and
The settings of each setting section, such as measurement range setting, vertical axis position setting of the reference level of the displayed waveform, vertical axis sensitivity setting, horizontal axis time value setting, trigger polarity setting, etc., can be stored in advance according to the waveform to be observed. This refers to an oscilloscope that reads the stored settings corresponding to the observed waveform, sets each setting section according to the read settings, and displays the waveform.

In addition, to set each of the above settings, set the setting device corresponding to each setting section on the programmable oscilloscope or the knob of each setting section on the oscilloscope body of the programmable oscilloscope, and then use the setting device or knob. Read the position and store it in the storage device.

The setting contents corresponding to each setting section are referred to as setting data in this specification. Further, this setting operation is performed for each waveform to be observed, and the result is stored in the storage device. In addition, in this specification, 1
All setting data for one observed waveform is referred to as a program step. Therefore, a plurality of program steps consisting of a plurality of setting data are stored in the storage device, and normally several dozen program steps are stored.

On the other hand, each program step is handled as one group, and reading and writing from the storage device is handled as a group of stored data constituting each program step. Further, each program step is stored or assigned a number corresponding to it, and reading of the program step from the storage device is carried out by designating the number. By specifying this number, a program step is selectively called in accordance with the observed waveform, and each setting section is set according to the selected program step to perform waveform observation.

However, when using a programmable oscilloscope, it may be necessary to perform an automatic operation that sequentially selects a plurality of consecutive program step groups. This is the case when waveforms are continuously observed after each setting section is set according to the contents of program steps sequentially read out by automatic operation, or when the program steps are sequentially read out for inspection and verification.

For this reason, conventional programmable oscilloscopes use a pair of digital switches, one of which is used as a switch for specifying a start address that stores the program step for starting automatic operation, and the other is used as a switch for specifying a start address during automatic operation. It is used as a switch to specify the end address stored in the last program step of the program, and increases the address by +1 from the start address to the end address.
It is configured to advance step by step, and automatic operation is performed only within the range of the start address and end address.

Thereafter, a program step stored at an address located outside the above range of the storage device was read out to observe the waveform, and automatic operation could not be started from that address location. Therefore, after manually changing the address from the stored address of the program step outside the range to the address within the range,
The drawback was that it required automatic operation.

The present invention has been made in view of the above, and it is an object of the present invention to provide a method for addressing a storage device in a programmable oscilloscope that eliminates the above-mentioned drawbacks.

Hereinafter, the present invention will be explained by examples.

FIG. 1 is a block diagram of one embodiment of the present invention.

1 is a storage device of the programmable oscilloscope, 2 is an address counter that specifies the address of the storage device 1, and 3 is a register that specifies the start address value ST of automatic operation.

The output of the address counter 2 is input to a comparator 4 and compared with the maximum address value MA of the storage device 1, and is input to a comparator 5 to be the end address value for automatic operation.
Compare with ET. Comparator 4 is address counter 2
The comparator 5 generates a high level output only when the output of the address counter 2 coincides with the maximum address value, and the comparator 5 generates a high level output only when the output of the address counter 2 coincides with the end address value of the automatic operation.

The outputs of comparators 4 and 5 are input to an OR gate 6, and the output of OR gate 6 is input to an AND gate 7 to which clock pulse CK is applied as one input.
The output of the AND gate 7 is applied to the address counter 2, and the output of the AND gate 7 is applied to the address counter 2.
The output of the clock pulse CK is configured to be incremented by the clock pulse CK. On the other hand, the output of the OR gate 6 is applied to an AND gate 8, and the number set in the register 3 is loaded into the address counter 2 by the output of the AND gate 8. Furthermore, and gate 8
The clock pulse CK is applied as one input after being inverted.

In this embodiment configured as above, if automatic operation is started from address _P1 between start address ST and end address ET, comparators 4 and 5 both generate low potential outputs, The AND gate 7 is open, and the output of the address counter 2 is incremented by 1 each time the clock pulse CK is applied, thereby advancing the address of the storage device 2 by ₁ from the address P1. As a result, the output of the address counter 2 is sequentially incremented to the end address value ET.
The output of address counter 2 is the end address value ET
If it matches, comparator 5 generates a high level output,
It is applied to AND gate 7 through OR gate 6, which closes its gate and stops applying the clock pulse CK to address counter 2. On the other hand, the AND gate 8 opens its gate, and a signal obtained by inverting the clock pulse CK is applied to the address counter 2 as a load pulse.
Address counter 2 is preset to the number set in register 3. Since the automatic operation start address value ST is stored in the register 3, the automatic operation start address ST is specified in the storage device 1 via the address counter. This state is shown by curve a in FIG. 2, where the broken line indicates automatic operation and the solid line indicates return to the automatic operation start address.

Next, set the automatic operation to the minimum address of storage device 1.
Address between Mi and automatic operation start address ST
If it starts from P ₂ , address P ₂ is the minimum address of storage device 1 and automatic operation start address ST.
Since the comparators 4 and 5 are generating low level outputs, the clock pulse CK is applied to the address counter 2 via the AND gate 7, and the output of the address counter 2 is the clock pulse.
The automatic operation is incremented by 1 for every CK and the automatic operation is performed as shown by the broken line of curve b in Figure 2. When the output of the address counter 2 matches the automatic operation end address ET, the comparator 5 generates a high level output. The level output is applied to the AND gate 7 through the OR gate 6, inhibiting the application of the clock pulse CK to the address counter 2 as in the above case, and the load pulse is output from the AND gate 8, and the address counter 2 receives the clock pulse CK from the address counter 2. The number will be preset. This state is as shown by curve b in FIG.

Next, set the automatic operation end address ET.
If it starts from the address P ₃ between the maximum address M _A of the storage device 1 and the maximum address M A of the storage device 1, it operates in the same way as in the above case at the maximum address M _A of the storage device 1,
As shown by curve c in Figure 2, automatic operation is performed from address P ₃ to the maximum address M _A , and when the selected address reaches the maximum address M _A , the increment of the output of address counter 2 stops. and register 3 is stored in address counter 2.
The number will be preset. If the automatic operation is continued further, the automatic operation will start from the automatic operation start address.

Note that although the above description has been made using the case where the address is incremented by +1, the same configuration can be applied to the case where the address is incremented by -1.

As described above, according to the present invention, regardless of the output of the address counter at the start of automatic operation, that is, the selected address of the storage device at the start of automatic operation, the output of the address counter is the end address of automatic operation or the maximum address of the storage device ( (Small) By presetting the automatic operation start address that is preset in the register when the first address is reached, the drawbacks of conventional programmable oscilloscopes during automatic operation are solved.
There is no longer any restriction on the address position at the start of automatic operation. Therefore, if you want to read the contents of a program step stored at an address other than the start address and end address of automatic operation at the start of automatic operation, specify that address, read the contents of the program step, and then read the contents of the program step. Automatic operation can be started from the address position, increasing the degree of freedom of operation.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment to which the method of the present invention is applied. FIG. 2 is a diagram for explaining the operation of the embodiment shown in FIG. 1, 1...Storage device, 2...Address counter, 3
...Registers, 4 and 5...Comparators.

Claims (1)

[Claims] 1. In a method of addressing a storage device in a programmable oscilloscope when automatic operation is performed by sequentially +1 or -1 the output of an addressing means that specifies the address of a storage device that stores program steps, The output of the addressing means is sequentially incremented by +1 or -1, and when the output of the addressing means reaches either the end address of the automatic operation or the end address on one side of the storage device, the A memory device in a programmable oscilloscope characterized in that the address designating means stops sequentially incrementing the output by +1 or -1, and presets an automatic operation start address value set in a register in advance in the address designating means. Addressing method.