©2015 Silicon Storage Technology, Inc.

DS20005036C

04/15

8

64 Mbit SPI Serial Dual I/O Flash

SST25VF064C

EOL Data Sheet

Security ID

SST25VF064C offers a 256-bit Security ID (Sec ID) feature. The Security ID space is divided into two

parts – one factory-programmed, 64-bit segment and one user-programmable 192-bit segment. The

factory-programmed segment is programmed at SST with a unique number and cannot be changed.

The user-programmable segment is left unprogrammed for the customer to program as desired.

Use the Program SID command to program the Security ID using the address shown in Table 7. Once

programmed, the Security ID can be locked using the Lockout SID command. This prevents any future

write to the Security ID.

The factory-programmed portion of the Security ID can never be programmed, and none of the Secu-

rity ID can be erased.

Status Register

The software status register provides status on whether the flash memory array is available for any

Read or Write operation, whether the device is Write enabled, and the state of the Memory Write pro-

tection. During an internal Erase or Program operation, the status register may be read only to deter-

mine the completion of an operation in progress. Table 4 describes the function of each bit in the

software status register.

Table 4:

Status Register

Bit

Name

Function

Default at

Power-up

Read/Write

0

BUSY

1 = Internal Write operation is in progress

0 = No internal Write operation is in progress

0R

1

WEL

1 = Device is memory Write enabled

0 = Device is not memory Write enabled

0R

2

BP0

Indicate current level of block write protection (See Table 5)

1

R/W

3

BP1

Indicate current level of block write protection (See Table 5)

1

R/W

4

BP2

Indicate current level of block write protection (See Table 5)

1

R/W

5

BP3

Indicate current level of block write protection (See Table 5)

1

R/W

6

1. The Security ID status will always be ‘1’ at power-up after a successful execution of the Lockout SID instruction; other-

wise, the default at power up is ‘0’.

Security ID status

1 = Security ID space locked

0 = Security ID space not locked

01

R

7

BPL

1 = BP3, BP2, BP1, BP0 are read-only bits

0 = BP3, BP2, BP1, BP0 are readable/writable

0R/W

T4.0 25036