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:
Feb. 17, 2004
Filed:
Dec. 05, 2001
Lun Bin Huang, San Diego, CA (US);
STMicroelectronics, Inc., Carrollton, TX (US);
Abstract
An address range checking circuit capable of determining if a target address, A[M:0], is within an address space having 2 address locations beginning at a base address location, B[M:0], is disclosed, wherein the address range checking circuit does not require a large comparator circuit. The address range checking circuit comprises: 1) comparison circuitry for determining if the address segment A[N−1:0] is less than the address segment B[N−1:0] and generating on a first control signal; 2) first equivalence detection circuitry for determining if the address segment A[M:N] is equal to the address segment B[M:N] and generating an A=B status signal; 3) second equivalence detection circuitry for determining if the address segment A[M:N] is equal to the address segment B[M:N] plus one and generating an A=B+1 status signal; and 4) a multiplexer that outputs the A=B status signal or the A=B+1 status signal depending on the value of the first control signal.