SST25VF032B Silicon Storage Technology, Inc., SST25VF032B Datasheet - Page 8

• Manufacturer Part Number: SST25VF032B
• Description: 32 Mbit Spi Serial Flash
• Manufacturer: Silicon Storage Technology, Inc.

Advance Information
Block Protection (BP3,BP2, BP1, BP0)
The Block-Protection (BP3, BP2, BP1, BP0) bits define the
size of the memory area, as shown in Table 4, to be soft-
ware protected against any memory Write (Program or
Erase) operation. The Write-Status-Register (WRSR)
instruction is used to program the BP3, BP2, BP1 and BP0
bits as long as WP# is high or the Block-Protect-Lock
(BPL) bit is 0. Chip-Erase can only be executed if Block-
Protection bits are all 0. After power-up, BP3, BP2, BP1
and BP0 are set to the defaults specified in Table 4.
TABLE 4: Software Status Register Block Protection
©2008 Silicon Storage Technology, Inc.
Protection Level
1. X = Don’t Care (RESERVED) default is “0
2. Default at power-up for BP2, BP1, and BP0 is ‘111’. (All Blocks Protected)
None
Upper 1/64
Upper 1/32
Upper 1/16
Upper 1/8
Upper 1/4
Upper 1/2
All Blocks
BP3
X
X
X
X
X
X
X
X
Status Register Bit
BP2
0
0
0
0
1
1
1
1
8
FOR
Block Protection Lock-Down (BPL)
WP# pin driven low (V
Lock-Down (BPL) bit. When BPL is set to 1, it prevents any
further alteration of the BPL, BP3, BP2, BP1, and BP0 bits.
When the WP# pin is driven high (V
effect and its value is “Don’t Care”. After power-up, the BPL
bit is reset to 0.
BP1
0
0
1
1
0
0
1
1
SST25VF032B
2
BP0
0
1
0
1
0
1
0
1
1
32 Mbit SPI Serial Flash
IL
), enables the Block-Protection-
Protected Memory Address
3C0000H-3FFFFFH
3F0000H-3FFFFFH
3E0000H-3FFFFFH
380000H-3FFFFFH
300000H-3FFFFFH
200000H-3FFFFFH
000000H-3FFFFFH
IH
32 Mbit
SST25VF032B
None
), the BPL bit has no
S71327-01-000
T4.0 1327
4/08