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:
Aug. 10, 2004
Filed:
Feb. 20, 2001
Infineon Technologies AG, Munich, DE;
Abstract
A method and an apparatus for testing an SDRAM are described. The SDRAM is used as a main memory in the PC, and an additional circuit configuration is accommodated on a plug-in board and has an additional memory in the form of an SRAM and logic circuits. The method according to the invention allows the SDRAM to be tested in a module bank in the running PC to be set deliberately to a test mode. In this case the code for test mode activation is modified by a high-level language program (PASCAL) in accordance with the user requirements, is copied to the additional memory on the plug-in board, and is then called by the high-level language program using MS DOS. After activation of the selected test mode by a code programmed in Assembler, a defined jump is made back to the calling program once again. This allows the use of the test mode provided in the SDRAM in standard PCs and using standard operating systems. This greatly increases the test options for SDRAMs on standard PCs.