High speed microcomputer in-circuit emulator
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United States of America Patent
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-
Jun 14, 1994
Grant Date -
N/A
app pub date -
Jun 7, 1991
filing date -
Jun 7, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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