SST85LD0128 datasheet(13/73 Pages) SST

13 / 73 page

Advance Information

NANDrive

SST85LD0128 / SST85LD0256 / SST85LD0512

S71319-03-000

2/07

8.0 POWER-ON INITIALIZATION AND CAPACITY EXPANSION

NANDrive is self-initialized during the first power-up. As

soon as the power is applied to the NANDrive it reports

busy for up to five seconds while performing bad blocks

search and low level format. This initialization is a one time

event.

The NANDrive allows storage capacity expansion by using

additional external NAND Flash devices. Contact SST for a

list of supported standard NAND flash media devices for

each NANDrive product. During the first self-initialization,

the NANDrive firmware scans all connected flash media

devices and reads their device ID. If the device ID matches

the listed flash media devices, the NANDrive performs

drive recognition based on the algorithm provided by the

flash media suppliers, including setting up the bad block

table, executing all the necessary handshaking routines for

flash media support, and, finally, performing the low-level

format. For Power-on Timing Specifications, please refer to

Table 13-2.

If the drive initialization fails, and a visual inspection is

unable to determine the problem, SST provides a

comprehensive interface for manufacturing flow debug.

This interface not only allows debug of the failure and

manual reset of the initialization process, but also allows

customization of user definable options.

8.1 ATA/IDE Interface

The

ATA

interface

can

used

for

NANDrive

manufacturing support. SST provides an example of a

DOS-based solution (an executable routine downloadable

from www.sst.com) for manufacturing debug and rework.

8.2 Serial Communication Interface (SCI)

For additional manufacturing flexibility, the SCI bus can be

used for manufacturing error reporting. The SCI consists of

3 active signals: SCIDOUT, SCIDIN, and SCICLK.

9.0 LIFETIME EXPECTANCY

NANDrive provides minimum endurance of 100,000

program/erase cycles and 10 year data retention as stated

by the selected NAND Flash components. The extensive

ECC and wear leveling algorithms utilized in the NANDrive

extend the life of the product. Please refer to Wear Leveling

Architecture Technical Paper for real application life time

calculation.

SST85LD0128 Datasheet(PDF) 13 Page - Silicon Storage Technology, Inc

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