Quantum FIREBALL PLUS AS 10.2 Product Manual page 54

Basic Principles of Operation
• Clock Synthesizer
• PLL
• Serial Interface
• TA Detection and Correction
5.2.2.1 5.2.2.1 5.2.2.1 5.2.2.1 Pre-Compensator Pre-Compensator Pre-Compensator Pre-Compensator
The pre-compensator introduces pre-compensation to the write data received from
the sequencer module in the DCIIA. The pre-compensated data is then passed to
the R/W Pre-Amplifier and written to the disk. Pre-compensation reduces the write
interference from adjacent write bit.
5.2.2.2 5.2.2.2 5.2.2.2 5.2.2.2 Variable Gain Amplifier (VGA) Variable Gain Amplifier (VGA) Variable Gain Amplifier (VGA) Variable Gain Amplifier (VGA)
Digital and analog controlled AGC function with input attenuator for extended
range.
5.2.2.3 5.2.2.3 5.2.2.3 5.2.2.3 Butterworth Filter Butterworth Filter Butterworth Filter Butterworth Filter
Continuous time data filter which can be programmed for each zone rate.
5.2.2.4 5.2.2.4 5.2.2.4 5.2.2.4 FIR (Finite Impulse Response) Filter FIR (Finite Impulse Response) Filter FIR (Finite Impulse Response) Filter FIR (Finite Impulse Response) Filter
Digitally controlled and programmable filter for partial response signal
conditioning.
5.2.2.5 5.2.2.5 5.2.2.5 5.2.2.5 Flash A/D Converter Flash A/D Converter Flash A/D Converter Flash A/D Converter
Provides very high speed digitization of the processed read signal.
5.2.2.6 5.2.2.6 5.2.2.6 5.2.2.6 Viterbi Detector Viterbi Detector Viterbi Detector Viterbi Detector
Decodes ADC result into binary bit stream.
5.2.2.7 5.2.2.7 5.2.2.7 5.2.2.7 ENDEC ENDEC ENDEC ENDEC
Provides 16/17 or 24/25 code conversion to NRZ. Includes preamble and sync
mark generation and detection.
5.2.2.8 5.2.2.8 5.2.2.8 5.2.2.8 Servo Processor Servo Processor Servo Processor Servo Processor
Servo processor with servo data recovery and burst demodulation.
5.2.2.9 5.2.2.9 Clock Synthesizer Clock Synthesizer
5.2.2.9 5.2.2.9 Clock Synthesizer Clock Synthesizer
Provides programmable frequencies for each zone data rate.
5.2.2.10 5.2.2.10 5.2.2.10 5.2.2.10 PLL PLL PLL PLL
Provides digital read clock recovery.
5.2.2.11 5.2.2.11 5.2.2.11 5.2.2.11 Serial Interface Serial Interface Serial Interface Serial Interface
High speed interface for digital control of all internal blocks.
5.2.2.12 5.2.2.12 5.2.2.12 5.2.2.12 TA Detection and Correction TA Detection and Correction TA Detection and Correction TA Detection and Correction
Detects thermal asperities' defective sectors and enables thermal asperity
recoveries.
5-9 Quantum Fireball Plus AS 10.2/20.5/30.0/40.0/60.0 GB AT