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EP0474256A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

In-circuit emulator

Assignee: NEC Corp
•
Filing: 1991-09-09
•
Granted: —
•
Expires: 2011-09-09
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Abstract

Abstract An in-circuit emulator comprising a microprocessor having an input terminal for selecting whether or not the data obtained by accessing an external address should be registered in the cache memory, a register for storing an address for discontinuing the execution of the microprocessor, and a comparator for comparing an address outputted from the microprocessor with the address stored in the register. When the result of comparison is indicative of coincidence, the comparator outputs a coincidence output signal to the above mentioned terminal of the microprocessor, so that the data is inhibited from being registered into the cache memory. Therefore, an external access is performed for the address discontinuing the execution, and accordingly, a break address can be detected by a device external to the microprocessor.

Inventors

  • 👤 Tetsuji c/o NEC Corporation Hamauchi

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-08 19:55
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/36; G06F11/362; G06F11/3648; G06F11/3652

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 91 words
An in-circuit emulator comprising a microprocessor having an input terminal for selecting whether or not the data obtained by accessing an external address should be registered in the cache memory, a register for storing an address for discontinuing the execution of the microprocessor, and a comparator for comparing an address outputted from the microprocessor with the address stored in the register and for generating, when coincidence is obtained, a coincidence output signal to the terminal of the microprocessor, so that the data is inhibited from being registered into the cache memory.
Claim 2
Dependent Claim 37 words
An in-circuit emulator claimed in Claim 1 wherein the register outputs an interrupt request through a logic gate to an interrupt request input of the microprocessor and the logic gate is opened by the coincidence output signal.
Claim 3
Dependent Claim 23 words
An in-circuit emulator claimed in Claim 2 wherein the coincidence output signal is supplied through an inverter to the terminal of the microprocessor.
Claim 4
Dependent Claim 23 words
An in-circuit emulator claimed in Claim 1 wherein the coincidence output signal is supplied through an inverter to the terminal of the microprocessor.
Claim 5
Dependent Claim 71 words
An in-circuit emulator claimed in Claim 4 further including an additional comparator for comparing the address outputted from the microprocessor with the address stored in the register and for generating, when coincidence is obtained, a second coincidence output signal, and wherein the register outputs an interrupt request through a logic gate to an interrupt request input of the microprocessor and the logic gate is opened by the second coincidence output signal.

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