GD25LQ40xIGx 1.8V Uniform Sector Dual and Quad Serial Flash
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6. STATUS REGISTER
S15
S14
S13
S12
S11
S10
S9
S8
SUS1
CMP
LB3
LB2
LB1
SUS2
QE
SRP1
S7
S6
S5
S4
S3
S2
S1
S0
SRP0
BP4
BP3
BP2
BP1
BP0
WEL
WIP
The status and control bits of the Status Register are as follows:
WIP bit.
The Write In Progress (WIP) bit indicates whether the memory is busy in program/erase/write status register
progress. When WIP bit sets to 1, means the device is busy in program/erase/write status register progress, when
WIP bit sets 0, means the device is not in program/erase/write status register progress.
WEL bit.
The Write Enable Latch (WEL) bit indicates the status of the internal Write Enable Latch. When set to 1 the
internal Write Enable Latch is set, when set to 0 the internal Write Enable Latch is reset and no Write Status
Register, Program or Erase command is accepted.
BP4, BP3, BP2, BP1, BP0 bits.
The Block Protect (BP4, BP3, BP2, BP1, BP0) bits are non-volatile. They define the size of the area to be
software protected against Program and Erase commands. These bits are written with the Write Status Register
(WRSR) command. When the Block Protect (BP4, BP3, BP2, BP1, BP0) bits are set to 1, the relevant memory
area (as defined in Table1). becomes protected against Page Program (PP), Sector Erase (SE) and Block
Erase (BE) commands. The Block Protect (BP4, BP3, BP2, BP1 and BP0) bits can be written provided that
the Hardware Protected mode has not been set. The Chip Erase (CE) command is executed, only if the Block
Protect (BP4, BP3, BP2, BP1 and BP0) are set to “None protected”.
SRP1, SRP0 bits.
The Status Register Protect (SRP1 and SRP0) bits are non-volatile Read/Write bits in the status register. The
SRP bits control the method of write protection: software protection, hardware protection, power supply lock-
down or one time programmable protection.
SRP1 SRP0 #WP
Status Register
Description
The Status Register can be written to after a Write Enable
command, WEL=1.(Default)
0
0
0
1
1
0
1
1
0
1
×
0
1
×
×
Software Protected
Hardware Protected WP# = 0, the Status Register locked and can not be written to.
WP# = 1, the Status Register is unlocked and can be written to
Hardware Unprotected
after a Write Enable command, WEL=1.
Power Supply
Lock-Down(1)
Status Register is protected and can not be written to again until
the next Power-Down, Power-Up cycle.
One Time Program(1) Status Register is permanently protected and can not be written to.
NOTE: (1). When SRP1, SRP0= (1, 0), a Power-Down, Power-Up cycle will change SRP1, SRP0 to (0, 0) state.
Rev.1.0
59 - 10
ELM [ ELM ELECTRONICS ]
