Uniform Sector

Dual and Quad Serial Flash

GD25Q21B

2

Contents

1.

FEATURES

.........................................................................................................................................................4

2.

GENERAL DESCRIPTION

................................................................................................................................5

3.

MEMORY ORGANIZATION

...............................................................................................................................7

4.

DEVICE OPERATION

........................................................................................................................................8

5.

DATA PROTECTION

..........................................................................................................................................9

6.

STATUS REGISTER

.........................................................................................................................................11

7.

COMMANDS DESCRIPTION

..........................................................................................................................13

7.1.

WRITE ENABLE (WREN) (06H)................................................................................................................................ 16

7.2.

WRITE DISABLE (WRDI) (04H) ................................................................................................................................ 16

7.3.

WRITE ENABLE FOR VOLATILE STATUS REGISTER (50H) ................................................................................................. 16

7.4.

READ STATUS REGISTER (RDSR) (05H OR 35H) .......................................................................................................... 17

7.5.

WRITE STATUS REGISTER (WRSR) (01H) ................................................................................................................... 17

7.6.

WRITE STATUS REGISTER (WRSR) (31H) ................................................................................................................... 18

7.7.

READ DATA BYTES (READ) (03H)............................................................................................................................. 19

7.8.

READ DATA BYTES AT HIGHER SPEED (FAST READ) (0BH).............................................................................................. 19

7.9.

DUAL OUTPUT FAST READ (3BH).............................................................................................................................. 20

7.10.

QUAD OUTPUT FAST READ (6BH) ............................................................................................................................. 20

7.11.

DUAL I/O FAST READ (BBH) .................................................................................................................................... 21

7.12.

QUAD I/O FAST READ (EBH) ................................................................................................................................... 22

7.13.

QUAD I/O WORD FAST READ (E7H) ......................................................................................................................... 24

7.14.

SET BURST WITH WRAP (77H) ................................................................................................................................. 26

7.15.

PAGE PROGRAM (PP) (02H).................................................................................................................................... 26

7.16.

QUAD PAGE PROGRAM (32H).................................................................................................................................. 28

7.17.

SECTOR ERASE (SE) (20H)....................................................................................................................................... 29

7.18.

32KB BLOCK ERASE (BE) (52H) ............................................................................................................................... 29

7.19.

64KB BLOCK ERASE (BE) (D8H)............................................................................................................................... 30

7.20.

CHIP ERASE (CE) (60/C7H)..................................................................................................................................... 30

7.21.

DEEP POWER-DOWN (DP) (B9H)............................................................................................................................. 31

7.22.

RELEASE FROM DEEP POWER-DOWN OR HIGH PERFORMANCE MODE AND READ DEVICE ID (RDI) (ABH).............................. 31

7.23.

READ MANUFACTURE ID/ DEVICE ID (REMS) (90H) ................................................................................................... 32

7.24.

READ MANUFACTURE ID/ DEVICE ID DUAL I/O (92H) ................................................................................................. 33

7.25.

READ MANUFACTURE ID/ DEVICE ID QUAD I/O (94H)................................................................................................. 34

7.26.

READ IDENTIFICATION (RDID) (9FH) ......................................................................................................................... 35

7.27.

HIGH PERFORMANCE MODE (HPM) (A3H) ................................................................................................................ 36

7.28.

ERASE SECURITY REGISTERS (44H) ............................................................................................................................ 36

7.29.

PROGRAM SECURITY REGISTERS (42H)....................................................................................................................... 37

7.30.

READ SECURITY REGISTERS (48H) ............................................................................................................................. 38

7.31.

CONTINUOUS READ MODE RESET (CRMR) (FFH)........................................................................................................ 39