SU1674017A1 - Device for checking dynamic parameters and operation of digital ic - Google Patents

Abstract

This invention relates to instrumentation technology. The goal is to increase the accuracy of control by eliminating errors, increasing the speed of the device due to its new organization — it is achieved by introducing into the device a register 15 of memory, a decisive block 16, a block 17 of a controlled delay. The device contains a memory element made on trigger 3, a delay element 7, D-flip-flops 4-6, an analog comparator 1 made on amplifier 2. 1 sludge.

Description

The invention relates to measuring technique and can be used in devices for the functional control of large integrated circuits.

The aim of the invention is to increase the accuracy of control by eliminating errors due to the heterogeneity of the channels of the prototype device, to increase the speed of the device due to its new organization.

The drawing shows a functional diagram of the device.

. The device contains an analog comparator 1, made on the amplifier 2, i memory element, made on the trigger! 3, D-triggers 4-6, delay element 7, information input 8, first and third equalizing inputs of the device 9-1'1, output 12 of the device, source 13 (U _O n) of the reference; voltage, the fourth control input 14 of the device, the memory register 15, the decision block 16, the block 17 controlled; delays, fifth control input 18, with L corresponding connections.

The controlled delay unit 17 is designed to delay the clock pulses synchronizing the signals of the reference information and the • control enable signals.

Clock pulses arrive through the device’s input 18 to the C-inputs of the D-flip-flops' 4,5, through the controlled delay unit 17 and delay the reference information signals and control enable signals at the outputs of the D-flip-flops 4 and 5 for a time equal to the delay of the block 17.

The device operates as follows.

The information input 8 of the device ’receives the output signal from the tested microcircuit with a given control frequency. Analog comparator 1 compares the output signals of the microcircuit with a logic level of 0 or 1, depending on the algorithm of the device. The value of the logical level is set by the source 13 of the reference voltage. To the control input 10th, therefore, to the D-input of trigger 5 receives a signal of reference information, to the control input 11 of the device receives a signal Resolution of control.

With the arrival of a strobe pulse to the control input 9 of the device and, consequently, to the second trigger input, the last information is currently recorded at the output of amplifier 2. With the arrival of the fifth control input 18 of the device delayed by the controlled delay unit 17 of the clock output at the trigger output 5, the reference information is set, and at the output of the trigger 6, the Control enable signal.

With the arrival at the synchronizing input of the register 15 of the memory of the delayed element 7 delay strobe-pulse information from the inputs of the register 15 of the memory is written to its outputs. The specified information goes to the inputs of the decision block 16. If the controlled information according to its logical levels corresponds to the specified values ”0 or 1, and also corresponds to the expected location recorded by the strobe pulse, then the output of the decision block 16, and therefore, the output 12 of the device no signal. This means that the monitored digital microcircuit is functioning properly. Otherwise, at the output 12 of the device, a signal of inconsistency of the output information of the controlled microcircuit with the specified requirements is formed, that is, the Marriage signal.

The device can operate as part of microchip control equipment with bi-directional outputs. In this case, the input of the analog comparator 1 is combined with the output of the channel forming the input effects on the controlled microcircuit, which is part of the indicated equipment. When monitoring the output information of the microcircuit, the output of the channel for generating the input influences passes the third state, characterized by a high output impedance. The operation of the device is described. When the channel is operating in the mode of setting the input actions to the microcircuit, the dynamic parameters and functioning control device is blocked by supplying a control inhibit signal to the control input 11 of the device, which, through the memory register 15, is supplied to the third information input of the decision block 16. At the same time, the output 12 of the device contains the Good signal ”Regardless of the level of signals at its first and second information inputs.

When monitoring dynamic parameters, the value of the reference voltage of the analog comparator 1 is programmed according to the technical specifications for the chip. Functional control of the output signals of the microcircuit at two logical levels is carried out alternately, first at level 0, and then at level G.

At the same time, the control results are recorded by external means of information processing - the control result, which make a conclusion about the suitability of the microcircuit.

Claims (1)

Claim A device for monitoring dynamic parameters and the functioning of digital integrated circuits, containing a memory element, a delay element, the first, second and third D-flip-flops, an analog comparator, the input of which is the information input of the device, and the output is connected to the first input of the memory element, the second input of which is the first control input of the device, a delay element, the output of which is connected to the C-input of the trigger, the output of which is the output of the device, the D-input of the second D-trigger is connected to the second control input m of the device, the D-input of the third D-trigger is connected to the third control input of the device, and its C-input is connected to the C-input of the second trigger, the fourth control input of the device, characterized in that, in order to improve the accuracy of control and speed of the device, a memory register, a decision block, a controlled delay block, the output of which is connected to the C-input of the third trigger, the control input to the fourth control input of the device, and the input is connected to the fifth control input of the device, the first second and third information The inputs of the memory register are connected respectively to the output of the memory element, the outputs of the second and third triggers, and the synchronization input to the output of the delay element, the first, second and third information inputs of the decision block are connected to the corresponding outputs of the memory register, the output to the D-input of the first trigger, the input of the delay element is connected to the first control input of the device. Compiled by E. Strokan Editor O. Spesivykh Tehred M. Morgenthal Corrector M. Demchik Order 2917 Circulation 412 Subscription VNIIIPI of the State Committee for Inventions and Discoveries at the State Committee for Science and Technology 113035, Moscow, Zh-35, Raushskaya nab., 4/5 Production and Publishing Combine Patent, Uzhgorod, 101 Gagarin St.