06009256 is referenced by 124 patents and cites 118 patents.

The SEmulation system provides four modes of operation: (1) Software Simulation, (2) Simulation via Hardware Acceleration, (3) In-Circuit Emulation (ICE), and (4) Post-Simulation Analysis. At a high level, the present invention may be embodied in each of the above four modes or various combinations of these modes. At the core of these modes is a software kernel which controls the overall operation of this system. The main control loop of the kernel executes the following steps: initialize system, evaluate active test-bench processes/components, evaluate clock components, detect clock edge, update registers and memories, propagate combinational components, advance simulation time, and continue the loop as long as active test-bench processes are present. Each mode or combination of modes provides the following main features or combinations of main features: (1) switching among modes, manually or automatically; (2) compilation process to generate software models and hardware models; (3) component type analysis for generating hardware models; (4) software clock set-up to avoid race conditions through, in one embodiment, gated clock logic analysis and gated data logic analysis; (5) software clock implementation through, in one embodiment, clock edge detection in the software model to trigger an enable signal in the hardware model, send signal from the primary clock to the clock input of the clock edge register in the hardware model via the gated clock logic, send a clock enable signal to the enable input of the hardware model's register, send data from the primary clock register to the hardware model's register via the gated data logic, and reset the clock edge register disabling the clock enable signal to the enable input of the hardware model's registers; (6) log selective data for debug sessions and post-simulation analysis; and (7) combinational logic regeneration.

Title
Simulation/emulation system and method
Application Number
8/850136
Publication Number
6009256
Application Date
May 2, 1997
Publication Date
December 28, 1999
Inventor
Steven Wang
Cupertino
CA, US
Ren Song Tsay
Palo Alto
CA, US
Mike Mon Yen Tsai
Los Altos Hills
CA, US
Richard Yachyang Sun
San Jose
CA, US
Quincy Kun Hsu Shen
Union City
CA, US
Sharon Sheau Pyng Lin
Cupertino
CA, US
Ping Sheng Tseng
Sunnyvale
CA, US
Agent
Chien Wei
Oppenheimer W Donnelly
Claude Hamrick
Assignee
Axis Systems
CA, US
IPC
G06F 17/50
G06F 9/455
View Original Source