US 6,647,536 B2Granted

VLSI layout design jobs scheduling method

AssigneeInternational Business Machines Corporation

InventorsDouglas Hooker Bradley, Tai Anh Cao

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Abstract

A method for automatically running a plurality of interactive programs that are necessary to complete a VLSI design and verification is disclosed. Layout data is completed and saved. Multiple programs of the VLSI logic are launched using this data. The submission of design programs (jobs) operate as program “states” with each program state having data inputs, data outputs possibly receiving logic inputs and generating logic outputs. The data inputs and data outputs may be conditional in that they were generated from other program states that may not have executed error free. Logic routines generate the logic signals which are logic combinations of the generated logic outputs and these logic signals may be used to launch other program states. Once the method is started, a designer simply corrects errors that occur and then re-starts the design process. The method keeps unconditional outputs of program states and updates conditional outputs and the program states execute until the VLSI design and verification is completed.

Claims26

Dependent claims

An Integrated Circuit (IC) layout design method, said IC layout design method having a set of layout design programs and an initial layout database describing said an IC layout, said IC layout design method comprising the steps of:

(a) organizing said set of layout design programs as executable program states, each of said program states generating program output data and program logic outputs and receiving program logic inputs and program input data, said program input data selected from said layout database;
(b) coupling said executable program states with a program scheduler, said program scheduler receiving from each of said executable program states, said program logic outputs and program output data and generating and sending to each of said executable program states said program logic inputs and program input data, said program scheduler further receiving designer control signals and receiving data from said layout database and updating said layout database data in response to said designer control signals and said program logic outputs and said program output data;
(c) starting execution of selected program states from said set of program states, concurrently, in response to said designer control signals and said program logic inputs;
(d) completing said selected program states and starting additional program states unless stopped by said program scheduler in response to said program logic outputs;
(e) determining if all program states in said set of program states have completed successfully, stopping said layout design if all programs have completed successfully and sending designer action data to a designer if all programs have not completed successfully;
(f) correcting said layout database by said designer if all programs have not completed successfully;
and
(g) repeating said method steps (c)-(f) in response to one or more of said designer control signals wherein said designer control signals comprise a start Program Scheduler, set to execute in an Audit Mode in which all program states must complete error free, and a stop Program Scheduler.

5 more elements

A computer program product for an Integrated Circuit (IC) layout design method, said IC layout design method having a set of layout design programs and an initial layout database describing an IC layout, said computer program product embodied in a machine readable medium, including programming for a processor, said computer program comprising a program of instructions for performing the program steps of:

(a) organizing said set of layout design programs as executable program states, each of said program states generating program output data and program logic outputs and receiving program logic inputs and program input data, said program input data selected from said layout database;
(b) coupling said executable program states with a program scheduler, said program scheduler receiving said program logic outputs, program output data and generating said program logic inputs and program input data in response to designer control signals and said program logic outputs;
(c) starting execution of selected program states from said set of program states, concurrently, in response to said designer control signals and said program logic inputs and completing said selected program states and starting additional program states unless stopped by said program scheduler;
(d) correcting said layout database if all program states have not completed successfully and stopping said layout design if all program states have completed successfully;
(e) repeating said method steps (c) and (d) in response to one or more of said designer control signals wherein said designer control signals comprise a start Program Scheduler, a set to execute in an Audit Mode in which all program states must complete error free, and a stop Program Scheduler.

2 more elements

A data processing system, comprising:

a central processing unit (CPU);
shared random access memory (RAM);
read only memory (ROM);
an I/O adapter;
a display adapter;
a display;
and
a bus system coupling devices internal to said CPU,
said CPU having layout circuitry for generating for an Integrated Circuit layout said layout circuitry having a set of layout design circuits and a storage circuit for storing an initial layout database describing IC layout, said layout circuitry further comprising:
circuitry for organizing a set of layout design circuits as executable program states, wherein selected layout design circuits in each of said executable program states generate program output data and program logic outputs and receive program logic inputs and program input data, said program input data selected from said layout database;
circuitry for coupling said executable program states with a scheduler circuit, said scheduler circuit receiving said program logic outputs, said program output data and generating said program logic inputs and said program input data in response to designer control signals and said program logic outputs;
circuitry for concurrently starting execution of selected of said executable program states from said set of program states in response to said designer control signals and said program logic inputs and completing said selected program states and starting additional program states unless stopped by said scheduler circuit;
circuitry for correcting said layout database if all of said executable program states have not completed successfully and stopping executing said layout circuitry if all of said program states have completed successfully;
circuitry for repeating said executable program states in response to one or more of said designer control signals wherein said one or more designer control signals comprise a start scheduler circuit, a set execution mode to an Audit Mode in which all program states must complete error free, and a stop said scheduler circuit.

11 more elements

Dependencies are inferred from the claim text.