M28W320FCT datasheet(17/69 Pages) STMICROELECTRONICS

17 / 69 page

M28W320FCT, M28W320FCB

Command interface

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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 Table 5, Table 6 and Table 7 for the valid address.

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 Appendix B: Common Flash

Interface (CFI), Table 26, Table 27, Table 28, Table 29, Table 30 and Table 31 for details on

the information contained in the Common Flash Interface memory area.

Table 3.

Command Codes

Hex Code

Command

01h

Block Lock confirm

10h

Program

20h

Erase

2Fh

Block Lock-Down confirm

30h

Double Word Program

40h

Program

50h

Clear Status Register

55h

Reserved

56h

Quadruple Word Program

60h

Block Lock, Block Unlock, Block Lock-Down

70h

Read Status Register

90h

Read Electronic Signature

98h

Read CFI Query

B0h

Program/Erase Suspend

C0h

Protection Register Program

D0h

Program/Erase Resume, Block Unlock confirm

FFh

Read Memory Array

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