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Abstract

An asynchronous data path controller for reading, correcting, and transferring data on-the-fly from a digital recording device to a host system. Central to the data path controller is a RAM for storing the data as it is read from the recording device and a RAM controller for arbitrating access to the RAM. An error correcting system reads the data from the RAM, corrects the data, and then restores the corrected data back to the RAM before it is transferred to the host system. The error correcting system includes an error syndrome generator and a error location and error value generator. In a first embodiment, the data codewords, comprised of user data and redundancy symbols, are stored from the recording device into the RAM. The error syndrome generator reads the codewords from the RAM, generates error syndromes, and transfers the error syndromes to the error location and error value generator. In an alternative embodiment, the error syndrome generator receives the codewords directly from the recording device. Only the user data and the error syndromes are stored into the RAM. In both embodiments, uncorrected data is read from the RAM, corrected in response to the error syndromes, and the corrected data stored into the RAM for subsequent transfer to the host system. The steps of reading data from the recording device, correcting it, and transferring it to the host occurs concurrently and asynchronously.

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First Claim