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:
Jan. 19, 2010
Filed:
Sep. 12, 2008
Ji-eun Jang, Kyoungki-do, KR;
Kee-teok Park, Kyoungki-do, KR;
Ji-Eun Jang, Kyoungki-do, KR;
Kee-Teok Park, Kyoungki-do, KR;
Hynix Semiconductor Inc., Kyoungki-Do, KR;
Abstract
Provided is a test mode control circuit capable of preventing an MRS (mode register set) from changing in a test mode exit after a test mode entry. In the test mode control circuit, an MRS controller logically combines an MRS signal, a bank address, an MRS address, and a test mode control signal to output a latch control signal. A test mode control unit detects a test mode entry and a test mode exit to selectively activate one of a test mode set signal and a test mode exit signal, and outputs the test mode control signal having different voltage levels according to an activation state of the test mode set signal or the test mode exit signal. An address latch latches an input address when the MRS signal is activated, and outputs the latched input address as the MRS address when the latch control signal is activated.