Appeal No. 1997-4217
Application No. 08/307,178
invention tracks the state of each simulation process in order
to determine when the simulation processes become out-of-synch
and to back up and restore the simulated state to a previously
synchronized state. The invention is further illustrated by
the following claim.
1. A method for scheduling processes of a first
simulator and a second simulator, the simulators having cross
coupled first and second simulator inputs and outputs, the
method being executed by at least one processor pursuant to
program instructions of a control program stored in a memory
coupled to said at least one processor, the first and second
simulators stored as first and second simulation programs,
respectively, in said memory and executed by said at least one
processor, the method including the steps of:
(1) define an initial state, whereby said first and
second simulator outputs are initialized and a verified
simulation time (vt) and a first simulator current simulation
time (ct ) are set to an initial time value (t );1 0
(2) select and store a target timepoint (tt) later than
said first simulator current simulation time (ct );
1
(3) begin execution of said first simulator program
using said second simulator outputs as initial simulator
inputs;
(4) update said first simulator outputs by a first step
time (ªt ) not greater than said target timepoint (tt);
1
(5) define a second state, whereby said updated first
simulator outputs do not equal said first simulator outputs;
(6) define a third state whereby said updated first
simulator outputs equal said first simulator outputs;
3
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