In-circuit emulator

Details In-circuit emulator In-circuit emulator

1989-11-14

1991-10-08

Fleming, Michael R.

Boots, shoes, and leggings

364247, 3642476, 364260, 3642592, 36426791, 371 162, 371 19, G06F 1100

Patent

active

050560131

ABSTRACT:
An in-circuit emulator comprising an emulation microprocessor for directly outputting at least an address and an execution level information, a latch circuit for latching at least the execution level information outputted from the emulation microprocessor, a register holding a execution level information to be traced, a comparator receiving respective contents of the latch circuit and the register for generating an enable signal when the execution level information latched in the latch circuit is consistent with the execution level information to be traced of the register, and a trace memory coupled to receive the address outputted from the emulation microprocessor and responding to the enable signal so as to store the address outputted from the emulation microprocessor, whereby only the result of execution belonging to a selected execution level is traced in the trace memory.

REFERENCES:
patent: 4205370 (1980-05-01), Hirtle
patent: 4453093 (1984-06-01), Boudreau
patent: 4571677 (1986-02-01), Hirayama et al.
patent: 4598364 (1986-07-01), Gam et al.
patent: 4636940 (1987-06-01), Goodwin, Jr.
patent: 4674089 (1987-06-01), Doret et al.
patent: 4802165 (1989-07-01), Ream
patent: 4847805 (1989-07-01), Ishii et al.
patent: 4879646 (1989-11-01), Iwasaki et al.
patent: 4933941 (1990-06-01), Eckard et al.

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