Test apparatus for electronic control systems, particularly automotive-type computers
First Claim
1. Test apparatus, for testing electronic control systems providing clock signals and test data words as a combined serial data stream, havinga serial data input port (1);
- a display device (6);
and comprising, in accordance with the invention,a combination shift-register-and-memory unit (5) having a clock input (Cl) and a data input (D) connected to the serial data input port (1) for receiving and reading data, and for storing data;
means (4), connected between said serial data input port (1) of said test apparatus and said data input (D) of said combination unit (5), for separating said combined serial data stream into clock signals and test data in the form of a sequence of logical zero and logical one signals,said means (4) applying said test data to said data input (D) for sequential shifting thereof, in synchronism with said clock signals, into a shift register portion of said combination unit;
a retriggerable monostable flip-flop (3) which is connected to receive said test data and has a timing period selected to detect the end of each data word and thereby recognize termination of data transmission to the shift-register-and-memory unit (5),the monostable flip-flop (3) having an output coupled to an input of the shift register other than said data input (D) and controlling the shift-register-and-memory unit (5) to transfer shifted data from said shift register portion of said combination unit (5) into a memory portion thereof and to display the data stored in the memory portion.
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Accused Products
Abstract
To provide an inexpensive test apparatus for testing the performance of control computers in automotive vehicles, for example sufficiently simple to be affordable by gasoline service stations, small garages and the like, a shift register-memory combination unit is provided receiving the data in serial, preferably Pulse-Duration-Modulated (PDM), form, and a monostable flip-flop is connected to the shift register, connected to be SET by a flank, preferably the trailing flank, of the first bit of a data word, and having a timing period somewhat longer than the longest interval between sequential bits, the monostable flip-flop being connected to control the shift register to transfer data in the shift register to a memory section thereof for simultaneous display of the data in the various storage locations of the memory section of the shift register. A counter can be used to inhibit application of clock pulses to the shift register beyond a predetermined count so that only those data which have been transmitted up to the inhibit count will be stored in the shift register for subsequent display.
16 Citations
11 Claims
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1. Test apparatus, for testing electronic control systems providing clock signals and test data words as a combined serial data stream, having
a serial data input port (1); -
a display device (6); and comprising, in accordance with the invention, a combination shift-register-and-memory unit (5) having a clock input (Cl) and a data input (D) connected to the serial data input port (1) for receiving and reading data, and for storing data; means (4), connected between said serial data input port (1) of said test apparatus and said data input (D) of said combination unit (5), for separating said combined serial data stream into clock signals and test data in the form of a sequence of logical zero and logical one signals, said means (4) applying said test data to said data input (D) for sequential shifting thereof, in synchronism with said clock signals, into a shift register portion of said combination unit; a retriggerable monostable flip-flop (3) which is connected to receive said test data and has a timing period selected to detect the end of each data word and thereby recognize termination of data transmission to the shift-register-and-memory unit (5), the monostable flip-flop (3) having an output coupled to an input of the shift register other than said data input (D) and controlling the shift-register-and-memory unit (5) to transfer shifted data from said shift register portion of said combination unit (5) into a memory portion thereof and to display the data stored in the memory portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification