DP849007

The DP84900 is designed to perform the encoding and decoding for disk memory systems. DP849007 is designed to interface directly with National Semiconductor's integrated read channel circuits such as the DP8492. This Encoder/ Decoder (ENDEC) circuit DP849007 employs a 2/3 (1,7) Run Length Limited (RLL) code type and supports hard sectored format. The DP849007 also includes write data precompensation circuitry which detects the need for precompensation. This circuitry issues early, late and level (PCOMP3T) output signals necessary for two levels of precompensation. Precompensation information is generated against both the 2T and 3T patterns. The precompensation circuitry can be bypassed by the setting of a bit in the control register.

A control register is included to configure the ENDEC and to select several device operation options such as output code inversion and TRI-STATEÉ of the NRZ output.

The DP84900 is available in a 20-pin SO and SSO package.