M28R400CT, M28R400CB
Table 3. Commands
Commands
Bus Write Operations
No. of
Cycles
1st Cycle
2nd Cycle
Addr
3nd Cycle
Addr
Bus
Op.
Bus
Op.
Bus
Op.
Addr Data
Data
Data
Read
Addr
Read Memory Array
Read Status Register
1+
1+
Write
Write
X
X
FFh
70h
Data
Read
Read
Status
Register
X
Signature
Read Electronic Signature
Read CFI Query
Block Erase
1+
1+
2
Write
Write
Write
Write
Write
X
55h
X
90h
98h
20h
80h
Read
Read
Write
Write
Write
Signature
Query
D0h
(2)
Addr
CFI Addr
Block
Addr
Chip Erase
2
X
X
D0h
40h or
10h
Data
Input
Program
2
X
Addr
Data
Input
Data
Input
(3)
3
Write
X
30h
Write
Addr 1
Write
Addr 2
Double Word Program
Clear Status Register
Program/Erase Suspend
Program/Erase Resume
1
1
1
Write
Write
Write
X
X
X
50h
B0h
D0h
Block
Address
Block Lock
2
2
2
2
Write
Write
Write
Write
X
X
X
X
60h
60h
60h
C0h
Write
Write
Write
Write
01h
D0h
2Fh
Block
Address
Block Unlock
Block Lock-Down
Block
Address
Protection Register
Program
Data
Input
Address
Note: 1. X = Don't Care.
2. The signature addresses are listed in Tables 4, 5 and 6.
3. Addr 1 and Addr 2 must be consecutive Addresses differing only for A0.
Table 4. Read Electronic Signature
Code
Device
E
G
W
A0
A1
A2-A7
A8-A17
DQ0-DQ7
DQ8-DQ15
Manufacture.
Code
V
V
IL
V
V
V
IL
0
Don't Care
20h
00h
IL
IH
IL
V
V
V
V
V
V
V
V
M28R400CT
M28R400CB
0
0
Don't Care
Don't Care
2Ah
2Bh
88h
88h
IL
IL
IL
IH
IH
IH
IL
Device Code
V
V
IL
IL
IH
Note:
RP = V .
IH
13/48
NUMONYX [ NUMONYX B.V ]
