GD25LQ40xIGx 1.8V Uniform Sector Dual and Quad Serial Flash
http://www.elm-tech.com
Figure 1. Hold Condition
CS#
SCLK
HOLD#
HOLD
HOLD
5. DATA PROTECTION
The GD25LQ40 provides the following data protection methods:
Write Enable (WREN) command: The WREN command is set the Write Enable Latch bit (WEL). The WEL
bit will return to reset by the following situation:
♦
- Power-Up / Write Disable (WRDI) / Write Status Register (WRSR)
- Page Program (PP) / Sector Erase (SE) / Block Erase (BE) / Chip Erase (CE)
Software Protection Mode: The Block Protect (BP4, BP3, BP2, BP1, BP0) bits define the section of the
memory array that can be read but not change.
♦
Hardware Protection Mode: WP# going low to protected the BP0~BP4 bits and SRP0~1 bits.
Deep Power-Down Mode: In Deep Power-Down Mode, all commands are ignored except the Release from
Deep Power-Down Mode command.
♦
♦
Table 1. GD25LQ40 Protected area size (CMP=0)
Status Register Content
BP4 BP3 BP2 BP1 BP0
Memory Content
Addresses
Blocks
Density
NONE
64KB
128KB
256KB
64KB
128KB
256KB
512KB
4KB
Portion
NONE
×
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
×
0
0
0
1
1
1
×
0
0
0
0
0
1
1
1
1
1
×
0
0
0
0
0
0
0
1
0
0
0
1
1
0
0
0
1
1
1
0
0
1
1
0
1
1
×
0
1
1
0
1
0
1
1
0
1
1
0
1
0
1
1
0
1
×
1
0
1
×
0
1
0
1
×
0
1
NONE
NONE
7
070000H-07FFFFH
060000H-07FFFFH
040000H-07FFFFH
000000H-00FFFFH
000000H-01FFFFH
000000H-03FFFFH
000000H-07FFFFH
07F000H-07FFFFH
07E000H-07FFFFH
07C000H-07FFFFH
078000H-07FFFFH
078000H-07FFFFH
000000H-000FFFH
000000H-001FFFH
000000H-003FFFH
000000H-007FFFH
000000H-007FFFH
000000H-07FFFFH
Upper 1/8
Upper 1/4
Upper 1/2
Lower 1/8
Lower 1/4
Lower 1/2
ALL
Upper 1/128
Upper 1/64
Upper 1/32
Upper 1/16
Upper 1/16
Lower 1/128
Lower 1/64
Lower 1/32
Lower 1/16
Lower 1/16
ALL
6 and 7
4 to 7
0
0 and 1
0 to 3
0 to 7
7
7
7
7
7
0
0
0
0
8KB
16KB
32KB
32KB
4KB
8KB
16KB
32KB
32KB
512KB
0
0 to 7
Rev.1.0
59 - 8
ELM [ ELM ELECTRONICS ]
