m28w320ect STMicroelectronics, m28w320ect Datasheet - Page 14

• Manufacturer Part Number: m28w320ect
• Description: 32 Mbit 2mb X16, Boot Block 3v Supply Flash Memory
• Manufacturer: STMicroelectronics

M28W320ECT, M28W320ECB
The lock status can be monitored for each block
using the Read Electronic Signature command.
Locked-Down blocks revert to the locked (and not
locked-down) state when the device is reset on
Table 4. Commands
Note: 1. X = Don’t Care, RA=Read Address, RD=Read Data, SRD=Status Register Data, ID=Identifier (Manufacture and Device Code),
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Read Memory
Array
Read Status
Register
Read Electronic
Signature
Read CFI Query
Erase
Program
Double Word
Program
Quadruple Word
Program
Clear Status
Register
Program/Erase
Suspend
Program/Erase
Resume
Block Lock
Block Unlock
Block Lock-Down
Protection
Register Program
Commands
2. The signature addresses are listed in Tables 5, 6 and 7.
3. Program Addresses 1 and 2 must be consecutive Addresses differing only for A0.
4. Program Addresses 1,2,3 and 4 must be consecutive Addresses differing only for A0 and A1.
5. 55h is reserved.
6. To be characterized.
QA=Query Address, QD=Query Data, BA=Block Address, PA=Program Address, PD=Program Data, PRA=Protection Register Ad-
dress, PRD=Protection Register Data.
(3)
(4)
1+ Write
1+ Write
1+ Write
1+ Write
2
2
3
5
1
1
1
2
2
2
2
Write
Write
Write
Write
Write
Write
Write
Write
Write
Write
Write
Op. Add Data
1st Cycle
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
56h
D0h
C0h
FFh
70h
90h
20h
40h
10h
30h
50h
B0h
60h
98h
60h
60h
or
(6)
Read
Read
Read SA
Read
Write
Write
Write PA1
Write PA1
Write
Write
Write
Write
Op. Add Data
2nd Cycle
PRA
QA
BA
BA
BA
RA
BA
PA
X
(2)
SRD
PRD
PD1
PD1
D0h
D0h
2Fh
IDh
01h
RD
QD
PD
Bus Write Operations
power-down. Table. 10 shows the protection sta-
tus after issuing a Block Lock-Down command.
Refer to the section, Block Locking, for a detailed
explanation.
Write
Write
Op. Add Data Op.
3rd Cycle
PA2
PA2
PD2
PD2 Write
4th Cycle
Add Data
PA3
PD3 Write
Op. Add Data
5th Cycle
PA4
PD4