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DESCRIPTION

The Device is a highly integrated, automated single-chip Drive Manager and Disk Drive Controller IC designed for high-performance, headerless ATA drive applications. Figure 2 shows the chip’s main functional blocks.

ATA Host Interface Block

■ Synchronous DMA (modes 0-4)

■ Fast IDE PIO modes 0-4

■ ATA Multiword DMA modes 0-2; supports 60 ns cycle time

■ Basic level of ATAPI support

■ IORDY for PIO flow control

■ Automatic ATA R/W command execution

■ Automatic ATA task file updates

■ 128-byte host FIFO to/from buffer

■ LBA or CHS TASK File Modes

■ Read/write cache support with interrupt suppression

■ Programmable IRQ automation for different BIOS implementations

■ Provides logic for daisy chaining two embedded disk drive controllers

■ Full BIOS compatibility

■ On-chip selectable 4/8/12 mA host drivers

DSP Core

■ 60 MIPS operation

■ 16-bit, fixed-point DSP

■ 16x16-bit, 2’s complement parallel multiplier with 32-bit product

■ Single-cycle multiply and accumulate

■ 36-bit ALU with two 36-bit accumulators

■ Bit manipulation unit with 2 additional accumulators

■ 6 K words on-chip RAM

Buffer Controller Block

■ 16-bit wide buffer data bus

■ 16 Mbit x 16 SDRAM support; up to 150 Mbyte/s buffer bandwidth

■ Automated Data Flow Management (ADFM) automates disk/host transfers

■ Dynamic segment size switching

■ Auto-Write cache support

■ Automatic servo split address adjustment

■ Disk LBA counter

EDAC Block

■ Optimized ECC with up to six burst on-the-fly (OTF) correction

■ Programmable 480-bit Reed-Solomon code

■ Programmable 3-, 4-, or 5-way interleaving with 6 to 12 8-bit symbols per interleave

■ Optional 3 or 5 byte CRC support

■ Guarantee up to 233-bit single burst or six 33-bit bursts OTF correction in <3 sector time

■ ECC seeding validating servo and head track position

■ AIC-8381 polynomial support for backward compatibility

Disk Controller Block

■ Enhanced Headerless Architecture (EDSA)

■ Up to 450 Mbits/s data rate, byte-wide NRZ

■ 31 x 3 byte flexible high-speed RAM- based sequencer

■ Defect skipping and/or embedded servo capabilities with Constant Density Recording (CDR)

■ 128-byte disk FIFO to/from buffer

■ Disk error condition summary bit added to reduce error detection time

■ Three-index timer

■ MR and PRML channel support

Servo Block

■ Automatic internal sector mark generation

■ Programmable servo burst sequencer

■ Programmable servo timing mark sequencer

■ Flexible gating and control generation

■ User programmable control output pins

■ Allows servo format flexibility

■ Synchronous servo support

Other Features

■ 208-pin QFP package

■ Automatic and programmed power-down modes

■ 3.3 V I/Os with 5 V tolerance, 2.5 V logic core

■ Programmable read channel and preamp VCM serial interfaces

■ Dual on-chip frequency synthesizers optimize DSP, servo, Ultra-DMA and buffer performance

■ General purpose I/O and PWM pins

■ Programmable baud-rate RS232 interface