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:
Nov. 08, 2005
Filed:
Mar. 10, 2003
Hideshi Maeno, Tokyo, JP;
Hideshi Maeno, Tokyo, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
32 pseudo-random numbers respectively indicated by 5 bits are successively generated in a test address generating unit, a serial output signal denoting one pair of pseudo-random numbers of 10 bits are input to 10 flip-flops serially arranged in an address shift register for each clock cycle, a read address expressed by a string of bits output from the flip-flops of odd-numbered stages is input to a read port of a RAM to perform a read test for one memory cell of the read address, and a write address expressed by a string of bits output from the flip-flops of even-numbered stages is input to a write port of the RAM to perform a write test for one memory cell of the write address. The read test and the write test for 32 memory cells are alternately performed in 64 clock cycles.