CLSH3300 CIRRUS | Alldatasheet

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 3

Technical content

——s CL-SH3300 — rE ————7 ‘CIRRUS LOGIC ® Advance Product Bulletin a

FEATURES

General . @ Highly flexible, high-performance synchronous Sampled-Amplitude sampled-amplitude read/write channel Digital R/W Channel Device m@ High-performance channel data rates with support up to 72 MHz @ Support for 1- and 2-bit NRZ interfaces Sequence Detection OVERVIEW m Rate 2/3 RLL (1, 7) ENDEC The CL-SH3300 Sampled-Amplitude Digital Chan- = Complete implementation of synchronous elisa VLSI component designed to work with a disk channel with only two off-chip nonprecision controller and pre-amp to provide the majority of drive Pe components and controller hardware necessary to build a state-of- @ VGA with digital gain control the-art, high-density magnetic disk drive data path. @ Seventh-order Equi-ripple phase filter with — The CL-SH3300 implements a sampled-amplitude variable cutoff and variable boost using two read/write channel employing advanced partial- Reece ee exe eros " response polynomials and sequence detection tech- m™ SofTarget"” PRML sequence detection nology. It supports user data rates up to 48 Mbits per m Digital timing recovery and offset control second and channel rates up to72 MHz. Additionally, Error Tolerance a3.3-volt version of the CL-SH3300 will be offered as @ Error-tolerant synchronization mark detection the CL-SH3303. m@ Channel-quality circuitry for statistical perfor- | The CL-SH3300 includes many features that allow mance-related feedback of the channel the disk drive designer to include auto-calibration @ Erasure-pointer generation strategies in the channel design. A channel-quality circuit will interpret the characteristics of the incomin Head Support transitions pares the drive firmware feedback fea ™ Supports monolithic, composite, thin-film, MIG, can then be used to tune the channel for better and magneto-resistive heads results. Additionally, the digital nature of the channel Technology allows the disk drive designer to tailor the channel @ 100-pin Very Tight Pitch Quad Flat Pack (VQFP); (cont. next page) low-power CMOS technology Block Diagram every Drive K Differential Read Data waz bat z S CL-SHXXX a 1, Interface & y MEMORY EEO OOO

==, Sampled-Amplitude Digital R/W Channel Device —S=="CIRRUS LOGIC ee ee eee OVERVIEW cont.) parameters via programmable registers, resulting in | Sequence detector provides a user-specific partial a major reduction of passive components. response scheme that allows the detection strategy The CL-SH3300 offers digitally controlled loops to to be customized for a specific pulse shape. control gain, timing, andchanneloffset. Furthermore, Additionally, the degree of flexibility in the CL-SH3300 the loops can be configured with control coefficients architecture allows for more precise matching of HDA for both acquisition and tracking; the loops will and channel electronics. reconfigure wil the eller alll under control The CL-SH3300 offers a wide array of Power-down of the acquisition and tracking modes. Modes, allowing the disk drive designer to achieve The CL-SH3300 also includes an analog servo gain —_ extremely low average power consumption. ay ° baie demodulation of recovered servo The SofTarget technology, together with an on-chip Preseli teins filter specifically designed to minimize pole-tip effects The CL-SH3300 is a mixed-signal CMOS integrated or secondary gap effects, make the CL-SH3300 circuit that implements a highly flexible synchronous + compatible with monolithic, composite, thin film, MIG channel. PartialresponseschemessuchasPR4and and magneto-resistive heads. EPR4 may be implemented, and the SofTarget ™ CL-SH3300 Digital Features Analog Features + Prog. Digital Equalizer = AGC Amp * Sequence Detect 72-MHz * Equalization * Channel Quality Circuit Sample Rate v2 CL-SHXXX Pre-Amp = Timing VCO = Prog. Write Precomp, <1 Disk Controller = Prog. Synthesizer = (1,7) ENDEC * 6 Bit Flash ADC + Parallel Control Interface «= Servo Demod. = AGC Control = VCO Control CL-SH3300 Channel

pe dE) ——— | Sampled-Amplitude Digital R/ W Channel Device —S====, sal SNS —S="CIRRUS LOGIC FUNCTIONAL BLOCK DIAGRAM SERVO SERVO DEMOD. DECODER GAIN DETECT a Fy SPECTRAL ANALOG DIGITAL SEQUENCE & ri AID EQUALIZER SMOOTHING = FILTER PLL |. INAZIey

9 ENDEC vo

cLock FREQUENCY WRITE | WDout SYNTHESIZER PRECOMP ADVANTAGES Key Features Benefits e SofTarget™ Sequence Detector Flexible architecture supporting a broad range of partial-response polynomials. SofTarget allows the disk drive designer to tailor the behavior of the channel to a particular head/disk characteristic, thereby opti- mizing areal density. e Error-tolerant synchronization Supports the higher soft error rates and higher defect densities encountered at higher recording densities. « Programmable equalization, sampling and Provide optimum match to channel characteristics and detection alternatives permit channel optimization. e Rate 2/3 RLL (1,7) Recording Code Reduces nonlinear effects associated with closely- spaced transitions. « Intelligent Power Management Minimizes operational and idle power consumption.