A 48 Mb/s disk drive data separator

A high-speed data separator/endec has been developed The 48-Mb/s serial data are converted to a parallel 8-bit byte for NRZ data transfer at a 6-MHz clock rate. This design provides a means for operating a disk drive data channel at a 48-Mb/s data rate while allowing a much slower 6-MHz controller to interface with it. The circuitry includes additional functions that are important for such a high data rate application. The window symmetry control function allows accurate evaluation of the read channel decode window margin. The write precompensation feature allows accurate positioning of the encoded data on the media