The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 26, 1988
Filed:
May. 27, 1987
Toyokatsu Nakajima, Itami, JP;
Tatsuo Yamada, Itami, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A semiconductor IC device of an asynchronous bus type which is in a selected state when a chip select signal applied to it is at a 'H' level, comprises an external control signal line through which an external control signal is input, and a first and a second internal control signal lines for transfer of a first and a second control signals each of which is not activated when the other is activated. The first control signal is allocated to either the 'H' level or the 'L' level of the external control signal, and the second control signal is activated when the external control line is at the second level which is the inverse of the first level for the first control signal. An inhibit circuit is provided to prevent the second control signal from being erroneously activated while the first control signal is to be activated and when the first level of the external control signal begins after or terminates before the chip select signal.