M50FLW080A datasheet(25/64 Pages) STMICROELECTRONICS

25 / 64 page

M50FLW080A, M50FLW080B

Command interface

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Command interface

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

Commands consist of one or more sequential Bus Write operations. An internal

Program/Erase Controller handles all timings, and verifies the correct execution of the

Program and Erase commands. The Program/Erase Controller provides a Status Register

whose output may be read at any time to monitor the progress or the result of the operation.

The Command Interface reverts to the Read mode when power is first applied, or when

exiting from Reset. Command sequences must be followed exactly. Any invalid combination

of commands will be ignored. See Table 11 for the available Command Codes.

The following commands are the basic commands used to read from, write to, and configure

the device. The following text descriptions should be read in conjunction with Table 13.

4.1

Read Memory Array command

The Read Memory Array command returns the device 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 device to Read mode. Once the command is issued, the device

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

operations access the memory array.

If the Program/Erase Controller is executing a Program or Erase operation, the device will

not accept any Read Memory Array commands until the operation has completed.

For a multibyte read, in the FWH mode, the address, that was transmitted with the

command, will be automatically aligned, according to the MSIZE granularity. For example, if

MSIZE=7, regardless of any values that are provided for A6-A0, the first output will be from

the location for which A6-A0 are all ‘0’s.

Table 11.

Command codes

Hexa-decimal

Command

10h

Alternative Program Setup, Double/Quadruple Byte Program Setup, Chip

Erase Confirm

20h

Block Erase Setup

32h

Sector Erase Setup

40h

Program, Double/Quadruple Byte Program Setup

50h

Clear Status Register

70h

Read Status Register

80h

Chip Erase Setup

90h

Read Electronic Signature

B0h

Program/Erase Suspend

D0h

Program/Erase Resume, Block Erase Confirm, Sector Erase Confirm

FFh

Read Memory Array

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