M58BW016DB datasheet(28/69 Pages) STMICROELECTRONICS

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Command interface

M58BW016DT, M58BW016DB, M58BW016FT, M58BW016FB

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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. The commands are

summarized in Table 9: Commands. Refer to Table 9 in conjunction with the text

descriptions below.

4.1

Read Memory Array command

The Read Memory Array command returns the memory to Read mode. One Bus Write cycle

is required to issue the Read Memory Array command and return the memory to Read

mode. Subsequent read operations will output the addressed memory array data. Once the

command is issued the memory remains in Read mode until another command is issued.

From Read mode Bus Read commands will access the memory array.

4.2

Read Electronic Signature command

The Read Electronic Signature command is used to read the manufacturer code, the device

code or the Burst Configuration Register. One Bus Write cycle is required to issue the Read

Electronic Signature command. Once the command is issued subsequent Bus Read

operations, depending on the address specified, read the manufacturer code, the device

code or the Burst Configuration Register until another command is issued; see Table 5:

Asynchronous Read Electronic Signature operation.

4.3

Read Query command

The Read Query command is used to read data from the common Flash interface (CFI)

memory area. One Bus Write cycle is required to issue the Read Query command. Once

the command is issued subsequent Bus Read operations, depending on the address

specified, read from the common Flash interface memory area. See Appendix A: Common

Flash interface (CFI), Table 25, Table 26, Table 27, Table 28 and Table 29 for details on the

information contained in the common Flash interface (CFI) memory area.

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