M28W640FCT_06 datasheet(17/77 Pages) STMICROELECTRONICS

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M28W640FCT, M28W640FCB

Command interface

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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), Tables 26, 27, 28, 29, 30 and 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

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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