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:
Oct. 11, 2005
Filed:
Feb. 21, 2002
David A. Freitas, Morgan Hill, CA (US);
Kevin R. Vannorsdel, San Jose, CA (US);
David A. Freitas, Morgan Hill, CA (US);
Kevin R. Vannorsdel, San Jose, CA (US);
Abstract
Magneto-Resistive (MR) head read/write channel () provides timer (), detector () and amplifier () to reduce the amount of time required to transition from read mode to write mode. Controller () issues the write command (WGATE) to signal a pending mode change from read to write mode. While read/write channel () remains in read mode, timer () begins a configurable countdown sequence, which allows Arm Electronics (), except for a final output stage of amplifier (), to power up in preparation for write mode. Once timer () has reached terminal count, signal (CHWGATE) is de-asserted, which causes write channel () to warm up. After warm up, write channel () writes serial data (WRITE DATA) to detector (). Still in read mode, detector () detects the presence of WRITE DATA from write channel () and asserts signal (AEWGATE). The assertion of signal (AEWGATE) cancels read mode and enables amplifier () to source current to MR head () in response to WRITE DATA to begin a fully operational write mode.