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