High speed microcomputer in-circuit emulator

Details High speed microcomputer in-circuit emulator High speed microcomputer in-circuit emulator

1991-06-07

1994-06-14

Harrell, Robert B.

Boots, shoes, and leggings

3642323, 3642643, 364DIG1, G06F 1130

Patent

active

053218280

ABSTRACT:
An in-circuit emulator (ICE) for hardware/software development and debugging microprocessors. Program execution reconstruction is extracted from an on-board cache memory. An external ICE enclosure interfaces to a target system microprocessor via a cable and a buffer/interface pod. A control program directs a non-intrusive emulation and a monitor program resides in a personal computer host and supports ICE commands. The monitor program allows a user to follow a target system's program flow, to capture related processor information, to make program modifications, and allows the user to restart programs. An on-line disassembler presents a display so as to allow the designer to examine memory, using instruction mnemonics rather than hexadecimal values, thus improving the designer's ability to read program memory. A bit trace buffer records the state of each the microprocessor's signals during each cycle of each instruction. Multiple breakpoints allow a system developer to control a program in ROM, as well as one resident in RAM. An external-range hardware breakpoint and up to sixteen software breakpoints are provided and these allow a designer to display, set and reset breakpoint addresses.

REFERENCES:
patent: 4674089 (1987-06-01), Poret et al.
patent: 5047926 (1991-09-01), Kuo et al.
patent: 5053949 (1991-10-01), Allison et al.
patent: 5056013 (1991-10-01), Yamamoto
patent: 5132971 (1992-07-01), Oguma et al.

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