GENERAL DESCRIPTION

The Philips Semiconductors P32P4911A is a high performance BiCMOS read channel IC that provides all of the functions needed to implement an entire Partial Response Class 4 (PR4) read channel for zoned recording hard disk drive systems with data rates from 42 to 125 Mbit/s or 33 to 100 Mbit/s. Functional blocks include AGC, programmable filter, adaptive transversal filter, Viterbi qualifier, 8,9 GCR ENDEC, data synchronizer, time base generator, and FWR servo.

FEATURES

General:

? Register programmable data rates from 42 to 125 Mbit/s or 33 to 100 Mbit/s

? Sampled data read channel with Viterbi qualification

? Programmable filter for PR4 equalization

? Five tap transversal filter with adaptive PR4 equalization

? 8/9 GCR ENDEC

? Data Scrambler/Descrambler

? Presettable Precoder State

? Programmable write precompensation

? Low operating power (0.925 W typical at 5V)

? Register programmable power management (<5 mW power down mode)

? 4-bit nibble and byte-wide bi-directional NRZ data interfaces

? 8-bit Direct Write mode automatically configured for RCLK = VCO/8

? Serial interface port for access to internal program storage registers

? Single power supply (5V ± 10)

? Small footprint, 100-lead LQFP package