SST85LD0256 datasheet(11/73 Pages) SST

11 / 73 page

Advance Information

NANDrive

SST85LD0128 / SST85LD0256 / SST85LD0512

S71319-03-000

2/07

4.0 CAPACITY SPECIFICATION

Table 4-1 shows the default capacity and specific settings for heads, sectors, and cylinders. The capacities listed apply to

either a single device or an externally expanded NANDrive. Users can change the default settings in the drive ID table

(see Table 12-4) for customization. If the total number of bytes is less than the default, the remaining space could be

used as spares to increase the flash drive endurance. It should also be noted that if the total flash drive capacity exceeds

the total default number of bytes, the flash drive endurance will be reduced.

5.0 EXTERNAL CLOCK INTERFACE

The external clock interface allows NANDrive operation

from an external clock source generated by an RC circuit.

Do not use a free running clock as input to the EXTCLKIN

pin; an RC circuit must be used. Contact SST for reference

circuit and recommended external clock settings.

While the device has an internal clock source, the external

clock source allows slowing of the system clock operation

to limit the peak current and overcome additional bus

The external clock interface consists of three signals:

INTCLKEN,

EXTCLKIN,

and

EXTCLKOUT.

The

INTCLKEN pin selects between external and internal clock

sources for the NANDrive. If this pin is pulled high before

device Power-on, then the internal clock source is selected;

otherwise, the external clock source is selected. The

EXTCLKIN and EXTCLKOUT signals are the input and

output clock signals, respectively.

6.0 SECURITY FEATURES

The SST85LD0128 / SST85LD0256 / SST85LD0512

NANDrive devices offer added data protection for

applications where data security is of the utmost

importance. The secure features are:

1. Protection zones - Customer can enable up to 4

independent protection zones, with two options:

Read-only or

Hidden (Read and Write protected) within each

protected zone. If protection zones are not

enabled the data is unprotected (default configura-

tion).

2. Password protection - Accessing information

within the protected zones can be only achieved

through a

customer-unique password.

3. Purge command - The system can issue a Purge

command to erase all information stored in the

flash media.

Contact SST for detailed specifications.

TABLE

4-1: Default NANDrive Settings

Capacity

Total Bytes

Cylinders

Heads

Sectors

Max LBA

128 MB

128,057,344

977

250,112

256 MB

256,901,120

980

501,760

512 MB

512,483,328

993

1,000,944

T4-1.6 1319

TABLE

4-2: Sustained Performance

Product

Write Performance

Read Performance

SST85LD0128

Up to 5 MB/sec without extended NAND Flash

Up to 10 MB/sec with extended NAND Flash

Up to 10 MB/sec

SST85LD0256

Up to 5 MB/sec without extended NAND Flash

Up to 10 MB/sec with extended NAND Flash

Up to 10 MB/sec

SST85LD0512

Up to 8 MB/sec without extended NAND Flash

Up to 10 MB/sec with extended NAND Flash

Up to 10 MB/sec

T4-2.1319

SST85LD0256 Datasheet(PDF) 11 Page - Silicon Storage Technology, Inc

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