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GD25LQ40XIGX Datasheet(PDF) 10 Page - ELM Technology Corporation |
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GD25LQ40XIGX Datasheet(HTML) 10 Page - ELM Technology Corporation |
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10 / 59 page  10 Rev.1.0 59 - http://www.elm-tech.com GD25LQ40xIGx 1.8V Uniform Sector Dual and Quad Serial Flash 6. STATUS REGISTER 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. 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 SRP1 SRP0 #WP Status Register Description 0 0 × Software Protected The Status Register can be written to after a Write Enable command, WEL=1.(Default) 0 1 0 Hardware Protected WP# = 0, the Status Register locked and can not be written to. 0 1 1 Hardware Unprotected WP# = 1, the Status Register is unlocked and can be written to after a Write Enable command, WEL=1. 1 0 × Power Supply Lock-Down(1) Status Register is protected and can not be written to again until the next Power-Down, Power-Up cycle. 1 1 × 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. |
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