Disk drive using loopback to calibrate transmission amplitude

Details Disk drive using loopback to calibrate transmission amplitude Disk drive using loopback to calibrate transmission amplitude

2007-10-09

2007-10-09

Nguyen, Hoa Thi (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

C714S716000, C702S085000

Reexamination Certificate

active

11280046

ABSTRACT:
A disk drive is disclosed for connecting to a host, the host comprising loopback circuitry operable to loop a pattern received from the disk drive back to the disk drive. The disk drive comprises interface circuitry including a transmitter driver operable to transmit transmission signals at a transmission amplitude, and a receiver driver operable to receive reception signals. The transmitter driver is configured to transmit at an initial transmission amplitude, and a calibration pattern is transmitted to the host through the transmitter driver. The reception signals received by the receiver driver are monitored to detect a loopback pattern representing a loopback of the calibration pattern. The loopback pattern is processed to detect an error, and the transmission amplitude is adjusted in response to the error.

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patent: 7027245 (2006-04-01), Mitchell et al.
patent: 2005/0024083 (2005-02-01), Kitamura et al.
U.S. Appl. No. 11/092,119, Masiewicz et al.
“Serial ATA: High Speed Serialized AT Attachment”, http://www.serialata.org, Jan. 7, 2003, Revision 1.0a, pp. 106-111.

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