3.3V Uniform Sector

Standard and Dual Serial Flash

GD25D40C/20C

18

Figure8. Page Program Sequence Diagram

7.9. Sector Erase (SE) (20H)

The Sector Erase (SE) command is for erasing the all data of the specific sector. A Write Enable (WREN) command

must previously have been executed to set the Write Enable Latch (WEL) bit. The Sector Erase (SE) command is entered

by driving CS# low, followed by the command code, and 3-address byte on SI. Any address inside the sector is a valid

address for the Sector Erase (SE) command. CS# must be driven low for the entire duration of the sequence.

The Sector Erase command sequence: CS# goes low  sending Sector Erase command  3-byte address on SI 

CS# goes high. The command sequence is shown in Figure9. CS# must be driven high after the eighth bit of the last address

byte has been latched in; otherwise the Sector Erase (SE) command is not executed. As soon as CS# is driven high, the

Register is accessed to check the value of the Write In Progress (WIP) bit. The Write In Progress (WIP) bit is 1 during the

self-timed Sector Erase cycle, and becomes 0 when it is completed. At some unspecified time before the cycle is completed,

the Write Enable Latch (WEL) bit is reset. A Sector Erase (SE) command applied to a sector which is protected by the Block

Protect (BP2, BP1, BP0) bit (see Table1) is not executed.

Figure9. Sector Erase Sequence Diagram

Command

0

1

2

3

4

5

6

7

02H

CS#

SCLK

SI

8

9 10

28 29 30 31

3

2

1

0

23 22 21

24-bit address

42 43 44 45

41

46 47

40

50 51 52 53

49

54 55

48

6

5

4

3

2

1

0

7

CS#

SCLK

SI

MSB

Data Byte 2

32 33 34 35

7

6

5

4

3

2

1

0

MSB

6

5

4

3

2

1

0

7

6

5

4

3

2

1

0

7

Data Byte 1

Data Byte 3

Data Byte 256

MSB

MSB

MSB

36 37 38 39

Command

0

1

2

3

4

5

6

7

20H

CS#

SCLK

SI

8

9

29 30 31

MSB

2

1

0

24 Bits Address

23 22