Visual display logic simulation system
AssigneesCirrus Computers Ltd., United Kingdom and British Telecommunications
InventorsGordon D. Robinson, Brian D. V. Smith
Life of this patent
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Abstract
An improved logic simulation system including a logic simulator which provides the logic states of elements within an electronic circuit being analyzed, means for associating the logic states with a schematic image of the electronic circuitry for display on a visual display device, wherein the improvement includes means for designating the color of the element being displayed which color represents the logic state of the element for a selected point in time.
Claims17
A visual display system comprising
- means for producing a visual representation of a digital electronic circuit on a display screen by way of a plurality of elements including functional symbols and interconnections therebetween;
- means for indicating on the screen the logical state of some or all of the constituent parts of the elements of said circuit for specified input conditions to said circuit, wherein said logical state is indicated by way of the manner in which an element is displayed;
- and
- control means for varying said indications of logical state in dependence upon variations in the inputs to said circuit and the reaction of the various elements of said circuit to said variations.
A visual display system comprising
- means for producing a visual representation of a digital electronic circuit on a display screen by way of a plurality of elements including functional symbols interconnected at nodes;
- means for displaying on the screen an indication of the testability value of some or all of the constituent nodes of said circuit wherein said testability is indicated by way of the manner in which the said circuit is displayed at each of said nodes;
- and
- control means for varying said indications of testability value in dependence upon variations elsewhere in the electronic circuit.
An improved logic simulation system of the type including a logic simulator responsive to a logical description of a circuit to be simulated and to input and output stimulus data, which logic simulator provides logic state information about the response of the circuit as a function of time;
- schematic and display formatting means responsive to the logic state information and to schematic element definitions and locations of the circuit to be simulated, for correlating the schematic element definitions and location with the logic state information;
- and display processor means responsive to the correlated element definition, location and logic state information for converting said information into a visual image, wherein the improvement comprises
- formatting means responsive to the logic state information and to the schematic element definitions and locations for inserting into the element definition a designation of the color in which the element is to be displayed, which color is representative of the logic state of the element.
A logic stimulation system providing a visual display of an electronic circuit being simulated, wherein the electronic circuit is displayed by way of a plurality of interconnected elements, and further wherein the logical states of the elements therein are displayed by displaying the elements in predetermined colors.
Dependencies are inferred from the claim text.