W25X40BL Datasheet, PDF (12/55 Pages) Winbond – 2.5V 4M-BIT SERIAL FLASH MEMORY WITH 4KB SECTORS AND DUAL I/O SPI

W25X40BL
7.1.6 Status Register Protect (SRP)
The Status Register Protect (SRP) bit is a non-volatile read/write bit in status register (S7) that can be
used in conjunction with the Write Protect (/WP) pin to disable writes to status register. When the SRP
bit is set to a 0 state (factory default) the /WP pin has no control over status register. When the SRP
pin is set to a 1, the Write Status Register instruction is locked out while the /WP pin is low. When the
/WP pin is high the Write Status Register instruction is allowed.
STATUS REGISTER PROTECT
(non-v olatile)
RESERVED
TOP/BOTTOM PROTECT
(non-v olatile)
BLOCK PROTECT BITS
(non-v olatile)
WRITE ENABLE LATCH
ERASE/WRITE IN PROGRESS
S7 S6 S5 S4 S3 S2 S1 S0
SRP (R) TB BP2 BP1 BP0 WEL BUSY
Figure 3. Status Register Bit Locations
7.1.7 Status Register Memory Protection
STATUS REGISTER⁽¹⁾
W25X40BL (4M-BIT) MEMORY PROTECTION
TB BP2 BP1 BP0 BLOCK(S)
ADDRESSES
DENSITY
PORTION
x0
0
0
NONE
NONE
NONE
NONE
00
0
1
7
070000h - 07FFFFh
64KB
Upper 1/8
00
1
0
6 and 7
060000h - 07FFFFh
128KB
Upper 1/4
00
1
1
4 thru 7
040000h - 07FFFFh
256KB
Upper 1/2
10
0
1
0
000000h - 00FFFFh
64KB
Lower 1/8
10
1
0
0 and 1
000000h - 01FFFFh
128KB
Lower 1/4
10
1
1
0 thru 3
000000h - 03FFFFh
256KB
Lower 1/2
x1
x
x
0 thru 7
000000h - 07FFFFh
512KB
ALL
Note: x = don’t care
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