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:
Sep. 09, 1997
Filed:
Jan. 11, 1996
Naoki Mitsuishi, Kodaira, JP;
Shiro Baba, Kokubunji, JP;
Hiromi Nagayama, Kodaira, JP;
Tsutomu Hayashi, Koganei, JP;
Yukihide Hayakawa, Kodaira, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A CPU has an upper compatibility with a low-order CPU to expand a continuously usable address space relatively. For latching data information, registers are constructed for being an address register with a bit number larger than the address bit number of a low-order CPU. The data information has its byte/word size specified by the size bit of an operation code. The utilization of the data information of a long word size is specified by either the prefix code or the operation code to which is newly added the same bit number as that of the low-order CPU. For the data information of the byte size, the high-/low-orders of the byte size register to be utilized are specified by predetermined 1 bit of a register specifying field. For the data information of the word size, the high-/low-orders of the word size register are specified by the predetermined 1 bit of that data information.