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