SST49LF004C View Datasheet(PDF) - Silicon Storage Technology

Part Name

Description

Manufacturer

SST49LF004C

4 Mbit / 8 Mbit LPC Serial Flash

Silicon Storage Technology 

Advance Information

Program-Suspend/

Program-Resume Command

The Program-Suspend and Program-Resume commands

have no influence on the device. Since the device requires

a maximum of TBP (10 µs) in order to program a byte (see

Table 27), when a Program-Suspend command is written,

the suspended Byte Program operation will always be suc-

cessfully completed within the suspend latency time (TES =

TBP = 10 µs).

Security ID Commands

The SST49LF00xC device offers a 256-bit Security ID

space. The Security ID space is divided into two parts. One

64-bit segment is programmed at SST with a unique 64-bit

number: this number cannot be changed by the user. The

other segment is 192-bit wide and is left blank: this space is

available for customers and can be programmed as

desired.

The User-Security-ID-Program command is shown in

Table 8, “Software Command Sequence”. Use the memory

addresses specified in Table 11 for Security ID program-

ming. Once the customer segment is programmed, it can

be locked to prevent any alteration. The User-Security-ID-

Program-Lockout command is shown in Table 8, “Software

Command Sequence”.

In order to read the Security ID information, the user can

issue a Read Security ID Command (90H) to the device. At

this point the device enters the Read-Software-ID/Read-

Security-ID mode. The Security ID information can be read

at the memory addresses in Table 11.

A Read-Array/Reset command (FFH) must then be issued

to the device in order to exit the Read-Software-ID/Read-

Security-ID mode and return to Read-Array mode.

An alternate method to read the Security ID information is

to read the Security ID registers located into the register

space as described in the “Security ID Registers” section.

4 Mbit / 8 Mbit LPC Serial Flash

SST49LF004C / SST49LF008C

Erase Sector/Block

Write B0H to any valid

device memory address

Write 70H to any valid

device memory address

Read Status Register

WSMS = 1

Yes

Erase-Suspend

Command

Read-Status-Register

Command

No

ESS = 1

No

Erase Completed

Yes

Write the Read-Array

command to read from

another Sector/Block

or

Write the Program

command to program

another Sector/Block

No

Finished?

Yes

Write D0H to any valid

device memory address

Erase-Resume

Command

Erase Resumed

1292 FC_Erase-Sus.0

FIGURE 7: ERASE-SUSPEND FLOW CHART

TABLE 11: SECURITY ID ADDRESSES

Address Range1

Security ID Segment

Size

FFFC 0180 to FFFC 0187

Factory-Programmed

8 bytes – 64 bit

FFFC 0188 to FFFC 019F

User-Programmed

24 bytes – 192 bit

T11.0 1292

1. Address shown is for boot device only. Address locations should appear elsewhere in the 4 GByte system memory map depending

on ID strapping values on ID[3:0} pins according with multiple device selection mechanism.

©200 Silicon Storage Technology, Inc.

20

S71292-00-000

1/06

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