M28W320FCT, M28W320FCB
Command interface
4.3
Read Electronic Signature command
The Read Electronic Signature command reads the Manufacturer and Device Codes and
the Block Locking Status, or the Protection Register.
The Read Electronic Signature command consists of one write cycle, a subsequent read will
output the Manufacturer Code, the Device Code, the Block Lock and Lock-Down Status, or
the Protection and Lock Register. See
and
for the valid address.
Table 3.
Command Codes
Command
Block Lock confirm
Program
Erase
Block Lock-Down confirm
Double Word Program
Program
Clear Status Register
Reserved
Quadruple Word Program
Block Lock, Block Unlock, Block Lock-Down
Read Status Register
Read Electronic Signature
Read CFI Query
Program/Erase Suspend
Protection Register Program
Program/Erase Resume, Block Unlock confirm
Read Memory Array
Hex Code
01h
10h
20h
2Fh
30h
40h
50h
55h
56h
60h
70h
90h
98h
B0h
C0h
D0h
FFh
4.4
Read CFI Query command
The Read Query Command is used to read data from the Common Flash Interface (CFI)
Memory Area, allowing programming equipment or applications to automatically match their
interface to the characteristics of the device. One Bus Write cycle is required to issue the
Read Query Command. Once the command is issued subsequent Bus Read operations
read from the Common Flash Interface Memory Area. See
and
for details on
the information contained in the Common Flash Interface memory area.
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