M29W320DB STMICROELECTRONICS [STMicroelectronics], M29W320DB Datasheet - Page 16

• Manufacturer Part Number: M29W320DB
• Description: 32 Mbit 4Mb x8 or 2Mb x16, Boot Block 3V Supply Flash Memory
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Bus operations
3.6
3.6.1
3.6.2
Table 2.
1. X = V
Table 3.
1. X = V
16/56
Bus Read
Bus Write
Output Disable
Standby
Read Manufacturer
Code
Read Device Code
Bus Read
Bus Write
Output Disable
Standby
Read Manufacturer
Code
Read Device Code
Operation
Operation
IL
IL
or V
or V
IH
IH
Special bus operations
Additional bus operations can be performed to read the Electronic Signature and also to
apply and remove Block Protection. These bus operations are intended for use by
programming equipment and are not usually used in applications. They require V
applied to some pins.
Electronic Signature
The memory has two codes, the manufacturer code and the device code, that can be read
to identify the memory. These codes can be read by applying the signals listed in
and
Block Protect and Chip Unprotect
Each block can be separately protected against accidental Program or Erase. The whole
chip can be unprotected to allow the data inside the blocks to be changed.
Block Protect and Chip Unprotect operations are described in
Bus Operations, BYTE = V
Bus Operations, BYTE = V
.
.
Table
V
V
V
V
V
V
V
V
V
V
E
X
E
X
3, Bus Operations.
IH
IH
IL
IL
IL
IL
IL
IL
IL
IL
V
V
V
V
V
V
V
V
V
V
G
G
X
X
IH
IH
IH
IH
IL
IL
IL
IL
IL
IL
V
V
V
V
V
V
V
V
V
V
W
W
X
X
IH
IH
IH
IH
IL
IH
IH
IH
IH
IL
IL
IH
Cell Address
Command Address
X
X
A0 = V
Others V
A0 = V
A9 = V
Cell Address
Command Address
X
X
A0 = V
Others V
A0 = V
Others V
(1)
(1)
DQ15A–1, A0-A20
IL
IH
ID
IL
IH
Address Inputs
Address Inputs
, A1 = V
, Others V
, A1 = V
, A1 = V
, A1 = V
IL
IL
IL
or V
or V
or V
A0-A20
IH
IH
IH
IL
IL
IL
IL
, A9 = V
, A9 = V
,
, A9 = V
IL
or V
IH
ID
ID
ID
,
,
,
DQ14-DQ8
Appendix C: Block
M29W320DT, M29W320DB
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Hi-Z
DQ15A–1, DQ14-DQ0
22CBh (M29W320DB)
22CAh (M29W320DT)
Data Inputs/Outputs
Data Inputs/Outputs
Data Output
Data Input
CAh (M29W320DT)
CBh (M29W320DB)
0020h
Hi-Z
Hi-Z
Data Output
Data Input
DQ7-DQ0
Hi-Z
Hi-Z
20h
Protection.
ID
Table 2
to be