M28W640HCT datasheet(17/72 Pages) NUMONYX

17 / 72 page

M28W640HCT, M28W640HCB

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 25, 26, 27, 28, 29 and 30 for details on the information contained in the

common Flash interface memory area.

4.5

Block Erase command

The Block Erase command can be used to erase a block. It sets all the bits within the

selected block to ’1’. All previous data in the block is lost. If the block is protected then the

erase operation will abort, the data in the block will not be changed and the Status Register

will output the error.

Two Bus Write cycles are required to issue the command:

●

The first bus cycle sets up the Erase command

●

The second latches the block address in the internal state machine and starts the

Program/Erase controller.

If the second bus cycle is not Write Erase Confirm (D0h), Status Register bits b4 and b5 are

set and the command aborts.

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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