Data processing system having a hierarchy of service computers including a state display
First Claim
1. A data processing system comprising, a general-purpose, programmable first computer constructed from a plurality of first circuits, said first circuits having direct connections for accessing said first circuits in connection with the execution of a first program of instructions, said first circuits having first redundant connections for use in accessing said first circuits independently of said first program of instructions, said first computer including first scanner means for accessing said first redundant connections,a programmable second computer constructed from a plurality of second circuits, said second circuits having direct connections for use in the execution of a second program of instructions using selected ones of said second circuits, said second circuits having second redundant connections for accessing said second circuits independently of said second program of instructions, said second computer including second scanner means for accessing said second redundant connections, said second computer connected to said first scanner means whereby said second program controls the accessing of said first circuits through said first redundant connection and independently of said first program of instructions,a programmable third computer constructed from a plurality of third circuits, said third computer executing a third program of instruction, said third computer connected to said second scanner means whereby said third computer controls the accessing of said second circuits through said second redundant connections under control of said third program and independently of said second program, said third computer including means for continuously monitoring said second computer to determine if said second computer requires control by said third computer,a display means for displaying scan data, anda fourth computer coupled to said display means for controlling the display of scan data from said third computer.
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Accused Products
Abstract
A data processing system having a hierarchy of computers including a first computer, a second computer, a third computer, and a fourth computer for displaying data from said third computer. Each of the first and second computers execute independent instruction streams. The first computer includes first circuit locations having redundant connections independently accessible by the second computer under control of the second instruction stream and independent of the first instruction stream. A third computer is provided for executing a third instruction stream. The third instruction stream and the third computer perform support functions which assist and control the operation of the second computer. The second computer includes second circuits having redundant connections independently accessible by the third computer under control of the third instruction stream.
9 Citations
25 Claims
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1. A data processing system comprising, a general-purpose, programmable first computer constructed from a plurality of first circuits, said first circuits having direct connections for accessing said first circuits in connection with the execution of a first program of instructions, said first circuits having first redundant connections for use in accessing said first circuits independently of said first program of instructions, said first computer including first scanner means for accessing said first redundant connections,
a programmable second computer constructed from a plurality of second circuits, said second circuits having direct connections for use in the execution of a second program of instructions using selected ones of said second circuits, said second circuits having second redundant connections for accessing said second circuits independently of said second program of instructions, said second computer including second scanner means for accessing said second redundant connections, said second computer connected to said first scanner means whereby said second program controls the accessing of said first circuits through said first redundant connection and independently of said first program of instructions, a programmable third computer constructed from a plurality of third circuits, said third computer executing a third program of instruction, said third computer connected to said second scanner means whereby said third computer controls the accessing of said second circuits through said second redundant connections under control of said third program and independently of said second program, said third computer including means for continuously monitoring said second computer to determine if said second computer requires control by said third computer, a display means for displaying scan data, and a fourth computer coupled to said display means for controlling the display of scan data from said third computer.
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20. A host computer coupled to a terminal, said host computer formed by circuits providing data paths of the computer where the circuits are formed on chips, the scan apparatus on each chip comprising,
sequencer means for performing scan sequences, control logic to control the scan sequence performed by said sequencer means, data line means selectively connected between said terminal and data paths in said host computer independently from the operation of said host computer, decoder means controlled by said sequencer means to control the selective connection of the data line means to access said locations.
Specification