M28W320CT, M28W320CB

34/42

Figure 16. Command Interface and Program Erase Controller Flowchart (a)

Note: 1. If no command is written, the Command Interface remains in its previous valid state. Upon power-up, on exit from power-down or

2. P/E.C. status (Ready or Busy) is read on Status Register bit 7.

AI03543

READ

SIGNATURE

YES

NO

90h

READ

STATUS

YES

70h

NO

CLEAR

STATUS

YES

50h

NO

PROGRAM

SET-UP

YES

40h or

10h

NO

ERASE

SET-UP

YES

20h

NO

ERASE

COMMAND

ERROR

YES

FFh

WAIT FOR

COMMAND

WRITE (1)

READ

STATUS

READ

ARRAY

YES

D0h

NO

A

B

NO

C

CFI

QUERY

YES

98h

NO

YES

60h

NO

BP/BU/BL

SET-UP

PRP

SET-UP

YES

C0h

NO

DPG

SET-UP

YES

30h

NO

C

D

01h

D0h

2Fh

PRP

READY

(2)

B

NO

NO

NO

NO

BP/BU/BL

COMMAND

ERROR

BLOCK

PROTECT

BLOCK

UNPROTECT

BLOCK

LOCK

YES

YES

YES

YES