M29DW128F datasheet(27/93 Pages) STMICROELECTRONICS

27 / 93 page

M29DW128F

6 Command Interface

27/93

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. Failure to observe a valid sequence of

Bus Write operations will result in the memory returning to Read mode. The long command

sequences are imposed to maximize data security.

The address used for the commands changes depending on whether the memory is in 16-bit or

8-bit mode.

6.1

Standard commands

See either Table 12, or Table 11, depending on the configuration that is being used, for a

summary of the Standard commands.

6.1.1

Read/Reset command

The Read/Reset command returns the memory to Read mode. It also resets the errors in the

Status Register. Either one or three Bus Write operations can be used to issue the Read/Reset

command.

The Read/Reset command can be issued, between Bus Write cycles before the start of a

program or erase operation, to return the device to Read mode. If the Read/Reset command is

issued during the time-out of a Block erase operation, the memory will take up to 10µs to abort.

During the abort period no valid data can be read from the memory.

The Read/Reset command will not abort an Erase operation when issued while in Erase

Suspend.

6.1.2

Auto Select command

The Auto Select command is used to read the Manufacturer Code, the Device Code, the

Protection Status of each block (Block Protection Status) and the Extended Block Protection

Indicator. It can be addressed to either Bank.

Three consecutive Bus Write operations are required to issue the Auto Select command. Once

the Auto Select command is issued Bus Read operations to specific addresses output the

Manufacturer Code, the Device Code, the Extended Block Protection Indicator and a Block

Protection Status (see Table 11 and Table 12 in conjunction with Table 4, Table 5, Table 7 and

Table 8). The memory remains in Auto Select mode until a Read/Reset or CFI Query command

is issued.

6.1.3

Read CFI Query command

The Read CFI Query Command is used to put the addressed bank in Read CFI Query mode.

Once in Read CFI Query mode Bus Read operations to the same bank will output data from the

Common Flash Interface (CFI) Memory Area. If the read operations are to a different bank from

the one specified in the command then the read operations will output the contents of the

memory array and not the CFI data.

One Bus Write cycle is required to issue the Read CFI Query Command. Care must be taken to

issue the command to one of the banks (A22-A19) along with the address shown in Table 3 and

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