Method and device for implementing single-chip microcomputer simulation using instruction replacement

Abstract

This invention discloses a kind of method and apparatus that can realize Single Chip Micyoco simulation by command replacement. The apparatus comprises simulating CPU, external program storage and synchronous preprocessing storage, command replacement and port reproduction circuit, simulation monitoring circuit, user-board simulation interface. The method is: when the command replacement and port reproduction circuit monitors that the simulating CPU will execute the import or export operation to data bus port or address bus port, the command replacement circuit replaces it with the other command immediately. And under the control of prot reproduction circuit, the reproduction port finishes the same import or export operation.

Description

technical field [0001] The invention mainly relates to the field of single-chip computer simulation, in particular to a method and device for realizing single-chip computer simulation by replacing instructions. Background technique [0002] With the development of computer technology, there are more and more types of single-chip microcomputers produced by various single-chip microcomputer manufacturers, and the internal resources are more and more abundant. In order to better develop and use these single-chip microcomputers, the support of emulation devices is needed. At present, domestic single-chip simulation devices mainly use Bondout simulation technology and HOOKS simulation technology. The use of Bondout simulation technology to produce simulation devices requires a dedicated simulation chip. On the basis of the standard chip, the dedicated simulation chip adds ports and hardware circuits for simulation. It does not occupy the input and output ports (I / O) of the stand...

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Problems solved by technology

The use of Bondout simulation technology to produce simulation devices requires a dedicated simulation chip. On the basis of the standard chip, the dedicated simulation chip adds ports and hardware circuits for simulation. It does not occupy the input and output ports (I / O) of the standard chip. , but lead out the simulation bus with a dedicated I / O pin, which does not occupy user resources, and the authenticity of the simulation is good, but it can only simulate standard chips, and there are few types of chips that can be simulated; use HOOKS simulation technology to produce simulation devices, It needs to be authorized by Philips, and the simulation CPU must contain hardware circuits that support HOOKS technology. When the single-chip microcomputer with HOOKS technology enters the HOOKS simulation state, the address data bus ports P0 and P2 will output / input the bus and P0, P2 in time-sharing For the value of the P2 port, the emulator uses hardware circuits to expand the multiplexed P0 and P2 ports into independent simulation buses and user P0 and P2 ports. It can emulate most of the Philips 51 series single-chip microcomputers, but it cannot for many single-chip microcomputers that do not support HOOKS technology. Simulation or simulation is not real, and there are few types of chips that can be simulated

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