Integrated circuit simulation analog waveform compression and decompression method and device

Abstract

The invention belongs to the technical field of integrated circuits, in particular to a method and device for compressing and decompressing simulated waveforms of integrated circuits. For the compression method, firstly, the input analog waveform data stream is divided into time slices according to the characteristics of the simulation time, and for each time slice, I frame and P frame are divided, and the zero value storage operation is performed on the I frame; for the P frame , calculate the residual with the I frame, then perform quantization, adaptive arithmetic coding, and store. The decompression process is the reverse of the compression process. The device includes an input unit, an output unit, a program storage unit, an external bus, a memory, a storage management unit, an input-output bridge unit, a system bus and a processor; compression and decompression programs are stored in the program storage unit. The invention compresses the analog waveform, can effectively reduce the occupied storage space, and achieves a high compression ratio with very low computational complexity.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a method and device for compressing and decompressing simulated waveforms of integrated circuits. Background technique [0002] In the process of integrated circuit design, functional verification is a very critical and time-consuming step, and the most important technical method of functional verification is simulation. The simulation process is as follows: a set of vectors and initialization parameters that need to be verified are input to the circuit, and then a large number of waveform files are generated. With the rapid development of integrated circuit design, the scale of the circuit is becoming larger and more complex, and the corresponding generated simulation waveform files are also getting larger and larger. The required hard disk space is often Giga bytes, and the storage space and time are getting more and more expensive. More, so fast wavefo...

AI Technical Summary

Problems solved by technology

[0003]While waveform compression appears to be an important and challenging problem to date, little work has been done on it

There are some classic compression algorithms [1,2,3], although they can effectively reduce the file size, there are also many optimized algorithms, but these algorithms need to consume a lot of computing time, and for analog waveform compression , usually the compression ratio is not ideal

There are still some commercial software that can support the storage of compressed waveforms, such as the waveform file WLF (Wave Log File) supported by Mentor Graphics’ Modelsim, and the waveform file fsdb (Fast Signal DataBase) supported by Spring Soft (Novas)’s Debussy / Verdi , the waveform file shm supported by Cadence's NC verilog and Simvision, and the waveform file vpd supported by Synopsys' VCS DVE, but their algorithms are not public,

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