RLL to NRZ decoder circuit in disk drive read/write channel

Details RLL to NRZ decoder circuit in disk drive read/write channel RLL to NRZ decoder circuit in disk drive read/write channel

1995-05-30

1998-01-13

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

In specific code or form

360 41, 360 51, 377 26, 377 68, G11B 509

Patent

active

057085366

ABSTRACT:
The present invention is directed to a decoder circuit that can be operated at higher frequencies of a RLL clock. RLL data input from a disk drive is shifted through a first stage of the decoder circuit by the standard RLL clock. The RLL data is shifted from the first stage through a second stage of the decoder circuit by a modified RLL' clock that operates at a lower frequency than the RLL clock. In a preferred embodiment, RLL' clock operates at one-third the frequency of the RLL clock. The decoding step is accomplished within the period of one clock cycle of the slower RLL' clock, which affords the decoder circuit of the present invention a sufficient amount of time to decode the RLL data from the disk drive into NRZ data for the host. Since RLL' clock used in the decoding step is slower, the RLL clock used to generate RLL' clock and to clock data into the decoder circuit from the disk drive can be operated at a higher frequency than currently possible. This improvement in the speed of the RLL clock provides an improvement in the throughput of data from disk drive to host.

REFERENCES:
patent: 4675652 (1987-06-01), Machado
patent: 5028922 (1991-07-01), Huang

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