SST58LM024 datasheet(5/40 Pages) SST

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Advance Information

ATA-Disk Module

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S71193-01-000

9/01

519

1.0 GENERAL DESCRIPTION

The SST’s ATA-Disk Module (ADM) contains a controller,

embedded firmware, and Flash Media with a 40-pin or 44-

pin female connector. Refer to Figure 1-1 for SST’s ADM

block diagram. The controller interfaces with the host sys-

tem allowing data to be written to and read from the Flash

Media.

1.1 Performance-optimized ATA Controller

The heart of the ADM is the ATA controller which translates

standard ATA signals into Flash Media data and controls.

SST’s ADM contains a proprietary ATA controller specifi-

cally designed to attain high data throughput from host to

Flash. The following components contribute to the ATA con-

troller’s performance.

1.1.1 Microcontroller Unit (MCU)

The MCU translates ATA commands into data and control

signals required for flash memory operation.

1.1.2 Internal Direct Memory Access (DMA)

The ATA controller inside ADM uses DMA allowing instant

data transfer from buffer to memory. This implementation

eliminates microcontroller overhead associated with tradi-

tional, firmware based, memory control, increasing data

transfer rate.

1.1.3 Power Management Unit (PMU)

Power Management Unit controls the power consumption

of the ADM. The PMU dramatically extends product battery

life by putting the part of the circuitry that is not in operation

into sleep mode.

1.1.4 SRAM Buffer

A key contributor to the ATA controller performance is an

SRAM buffer. The buffer optimizes the data writes to Flash.

1.1.5 Embedded Flash File System

Embedded Flash File System is an integral part of the

SST’s ATM controller. It contains MCU Firmware that per-

forms the following tasks:

1. Translates host side signals into Flash Media

Writes and Reads.

2. Provides Flash Media wear leveling to spread the

Flash writes across all the memory address space

to increase the longevity of Flash Media.

3. Keeps track of data file structures.

1.1.6 Error Correction

The ATA Controller contains ECC algorithm that corrects 3

bytes of error per 512 Byte sector.

FIGURE

1-1: SST ATA-DISK MODULE BLOCK DIAGRAM

519 ILL1-1.4

40 or 44-Pin

Male IDE Connector

40 or 44-Pin

Female IDE Connector

Mother

Board

ATA Controller

Flash

Media

Embedded

Flash

File System

MCU

ECC

Internal

DMA

SRAM Buffer

PMU

ATA-Disk Module

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