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:
Oct. 15, 1996
Filed:
Jun. 23, 1994
Hidenobu Gochi, Itami, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
In a semiconductor memory controller there are provided in parallel N-bit even number and odd number byte address decoder circuits, a 2N-bit address decoder circuit, even number and odd number byte subaddress decoder circuits for semiconductor memories having smaller capacities than semiconductor memories connected to the even and odd number byte subaddress decoder circuits and the 2N-bit address decoder circuit. The semiconductor memories are controlled to form a continuous address space. Signal levels are controlled by a pass through current preventing input buffer circuit, a three state output buffer circuit, and a backup state control circuit. Thereby, semiconductor memories different from each other in volatile/non-volatile type, memory capacity, and data bus width can be controlled even in a mixed state and unnecessary power consumption due to pass through power is significantly reduced.