M28W320 STMicroelectronics, M28W320 Datasheet - Page 34

• Manufacturer Part Number: M28W320
• Description: 32 Mbit 2Mb x16/ Boot Block Low Voltage Flash Memory
• Manufacturer: STMicroelectronics

M28W320CT, M28W320CB
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
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STATUS
READ
2. P/E.C. status (Ready or Busy) is read on Status Register bit 7.
B
if V
COMMAND
SIGNATURE
WAIT FOR
WRITE (1)
DD
READ
90h
falls below V
YES
PROTECT
BLOCK
NO
01h
QUERY
YES
98h
CFI
B
YES
NO
LKO
YES
NO
, the Command Interface defaults to Read Array mode.
STATUS
READ
UNPROTECT
70h
BLOCK
YES
READY
D0h
(2)
YES
D
NO
NO
NO
STATUS
CLEAR
50h
YES
NO
BLOCK
LOCK
2Fh
PRP
BP/BU/BL
SET-UP
YES
60h
YES
NO
NO
SET-UP
PRP
C0h
YES
COMMAND
BP/BU/BL
ERROR
NO
PROGRAM
SET-UP
40h or
10h
C
YES
NO
SET-UP
DPG
30h
C
YES
NO
SET-UP
ERASE
20h
D0h
A
YES
YES
NO
NO
COMMAND
ERROR
ERASE
FFh
YES
AI03543
NO
ARRAY
READ