Software state replay
First Claim
1. A method of analyzing a partition of a circuit design, comprising:
- sampling an emulator to obtain one or more input values provided at a first time to a partition of a circuit design being emulated;
sampling the emulator to obtain one or more first state values produced by the circuit design partition at the first time;
using the obtained one or more input values and the one or more first state values to execute a software model that describes the operation of the circuit design partition, so as to calculate one or more second state values produced by the circuit design partition at a second time; and
registering the one or more second state values in a tangible medium.
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Accused Products
Abstract
A tool for emulation systems that obtains the state values for only discrete partitions of a circuit design. When a partition is being emulated, the emulation system obtains the input values for the specified partition at each clock cycle and the state values for the specified partition at intervals. Using the state and input values with a software model of the specified circuit design partition, the tool calculates the state values for the partition at every clock cycle. The software model may correspond to the partitioning information used to implement the circuit design across multiple configurable logic element devices, such as FPGAs. Thus, each software model may correspond to the portion of a circuit design emulated on a discrete FPGA integrated circuit.
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Citations
25 Claims
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1. A method of analyzing a partition of a circuit design, comprising:
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sampling an emulator to obtain one or more input values provided at a first time to a partition of a circuit design being emulated;
sampling the emulator to obtain one or more first state values produced by the circuit design partition at the first time;
using the obtained one or more input values and the one or more first state values to execute a software model that describes the operation of the circuit design partition, so as to calculate one or more second state values produced by the circuit design partition at a second time; and
registering the one or more second state values in a tangible medium. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method recited of analyzing a circuit design partition, comprising
sampling an emulator emulating a partition of a circuit design to obtain each cycle of a clock signal being provided to the emulated circuit design partition during a defined analysis period, each input value provided to the emulated circuit design partition at every cycle during the defined analysis period, and one or more state values produced by the emulated circuit design partition at specified state value sample times over the defined analysis period; -
using the obtained input values, clock cycles and one or more sampled state values to execute a software model that describes the operation of the circuit design partition, so as to calculate state values produced by the circuit design partition during intervals between the specified state value sample times over the defined analysis period; and
registering at least the calculated state values in a tangible medium. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A software state replay tool, comprising:
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a model creation module that creates a software model describing the operation of a partition of a circuit design; and
a data sampling module that provides a software model created by the model creation module with data sampled from the emulation of the circuit design partition. - View Dependent Claims (24, 25)
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Specification