Western Digital Technologies, Inc.

Aristos Logic Corporation

Sanjay S Mathur

Hoover K Jung

Virgil V Wilkins

Richard William Hull

Robert L Horn

Marc E Acosta

An integrated I/O controller in an integrated circuit is provided for centralized data management. The integrated circuit includes a host interface, a disk interface, and a mapping controller implemented in hardware to speed data processing and provide fault tolerance as exemplified with RAID configurations. The mapping controller provides block mapping across a plurality of peripherals or disk drives in a disk array. The integrated I/O controller can be utilized in storage area network systems and network area storage systems as well as other networking systems or devices.

Integrated input/output controller

A disk drive has a channel circuit for demodulating data sectors and servo sectors stored on a rotating medium to provide data-sector data and servo-sector data. The channel circuit transmits the data-sector data and servo-sector data to a disk controller circuit in an order which is different than the order in which they are stored on a rotating medium to allow for demodulation latency while maintaining real-time updates of embedded servo information.

DISK DRIVE HAVING A CHANNEL CIRCUIT WHICH RECEIVES A READ SIGNAL REPRESENTING DATA IN A DATA SECTOR AND DATA IN A SERVO SECTOR IN A FIRST ORDER AND DEMODULATES THE READ SIGNAL TO PROVIDE DATA SECTOR DATA AND SERVO-SECTOR DATA IN A SECOND ORDER

A printed circuit board assembly (PCBA) includes first and second integrated-circuit terminals and first and second connector terminals. A first transmission line transmits a data signal and a second transmission line transmits a clocking signal. The PCBA includes integrated circuitry comprising first and second pads, a first digital circuit for propagating the data signal through the first pad and a second digital circuit for propagating the clocking signal through the second pad. The first transmission line includes a first integrated-circuit conductive path including a first series-connected integrated circuit resistive element and a first printed-circuit conductive path. The second transmission line includes a second integrated-circuit conductive path including a second integrated-circuit resistive element and a second printed-circuit conductive path. The first resistive element has a first ohmic value, the second resistive element has a second ohmic value, the first printed circuit conductive path has a third ohmic value and the second printed circuit conductive path has a fourth ohmic value. The ratio of the third to the first ohmic value is such that the first ohmic value is in excess of an order of magnitude greater than the third ohmic value and the ratio of the fourth to the second ohmic value is such that the second ohmic value is in excess of an order of magnitude greater than the fourth ohmic value. The ratio of the first to the second ohmic value is substantially less than the ratio of the third ohmic value to the first ohmic value.

Printed circuit assembly having integrated resistors for terminating data and control lines of a host-peripheral interface

A disk drive has a unified bus forming a signal path for transmitting register data, user data and servo sectors. The unified bus is connected between a channel circuit and a disk controller circuit. The channel circuit has an output stream engine which responds to and provides control signals to multiplex data on the unified bus at various times between demodulated user data, servo sector data and register data.

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Laguna Hills, CA, United States of America

Sanjay S Mathur