Method and apparatus for improved read-to-write transition...

Details Method and apparatus for improved read-to-write transition... Method and apparatus for improved read-to-write transition...

2005-10-11

2005-10-11

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

C360S062000

Reexamination Certificate

active

06954321

ABSTRACT:
Magneto-Resistive (MR) head read/write channel (400) provides timer (421), detector (433) and amplifier (432) to reduce the amount of time required to transition from read mode to write mode. Controller (410) issues the write command (WGATE) to signal a pending mode change from read to write mode. While read/write channel (400) remains in read mode, timer (421) begins a configurable countdown sequence, which allows Arm Electronics (430), except for a final output stage of amplifier (432), to power up in preparation for write mode. Once timer (421) has reached terminal count, signal (CHWGATE) is de-asserted, which causes write channel (422) to warm up. After warm up, write channel (422) writes serial data (WRITE DATA) to detector (433). Still in read mode, detector (433) detects the presence of WRITE DATA from write channel (422) and asserts signal (AEWGATE). The assertion of signal (AEWGATE) cancels read mode and enables amplifier (432) to source current to MR head (440) in response to WRITE DATA to begin a fully operational write mode.

REFERENCES:
patent: 4868691 (1989-09-01), Kawasaki
patent: 5363249 (1994-11-01), Fitzmorris
patent: 5381277 (1995-01-01), Jaffard et al.
patent: 5434717 (1995-07-01), Yoshinaga et al.
patent: 5623378 (1997-04-01), Shibasaki et al.
patent: 5724201 (1998-03-01), Jaffard et al.
patent: 5793555 (1998-08-01), Belser et al.
patent: 6219194 (2001-04-01), Stein et al.
patent: 6621649 (2003-09-01), Jiang et al.
patent: 3-269805 (1991-12-01), None

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