M50FW080 datasheet(23/56 Pages) STMICROELECTRONICS

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M50FW080

Command interface

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Command interface

All Bus Write operations to the memory are interpreted by the Command Interface.

Commands consist of one or more sequential Bus Write operations.

After power-up or a Reset operation the memory enters Read mode.

The commands are summarized in Table 9, Commands. The following text descriptions

should be read in conjunction with Table 9.

4.1

Read Memory Array command

The Read Memory Array command returns the memory to its Read mode where it behaves

like a ROM or EPROM. One Bus Write cycle is required to issue the Read Memory Array

command and return the memory to Read mode. Once the command is issued the memory

remains in Read mode until another command is issued. From Read mode Bus Read

operations will access the memory array.

While the Program/Erase Controller is executing a Program or Erase operation the memory

will not accept the Read Memory Array command until the operation completes.

4.2

Read Status Register command

The Read Status Register command is used to read the Status Register. One Bus Write

cycle is required to issue the Read Status Register command. Once the command is issued

subsequent Bus Read operations read the Status Register until another command is issued.

See the section on the Status Register for details on the definitions of the Status Register

bits.

4.3

Read Electronic Signature command

The Read Electronic Signature command is used to read the Manufacturer Code and the

Device Code. One Bus Write cycle is required to issue the Read Electronic Signature

command. Once the command is issued subsequent Bus Read operations read the

Manufacturer Code or the Device Code until another command is issued.

After the Read Electronic Signature Command is issued the Manufacturer Code and Device

Code can be read using Bus Read operations using the addresses in Table 8.

Table 8.

Read Electronic Signature

Code

Address

Data

Manufacturer Code

00000h

20h

Device Code

00001h

2Dh

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