M29F800D datasheet(11/39 Pages) STMICROELECTRONICS

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M29F800DT, M29F800DB

Table 3. Bus Operations, BYTE = VIH

Note: X = VIL or VIH.

COMMAND INTERFACE

All Bus Write operations to the memory are inter-

preted by the Command Interface. Commands

consist of one or more sequential Bus Write oper-

ations. Failure to observe a valid sequence of Bus

Write operations will result in the memory return-

ing to Read mode. The long command sequences

are imposed to maximize data security.

The address used for the commands changes de-

pending on whether the memory is in 16-bit or 8-

bit mode. See either Table 4, or 5, depending on

the configuration that is being used, for a summary

of the commands.

Read/Reset Command. The Read/Reset com-

mand returns the memory to its Read mode where

it behaves like a ROM or EPROM, unless other-

wise stated. It also resets the errors in the Status

can be used to issue the Read/Reset command.

The Read/Reset Command can be issued, be-

tween Bus Write cycles before the start of a pro-

gram or erase operation, to return the device to

read mode. Once the program or erase operation

has started the Read/Reset command is no longer

accepted. The Read/Reset command will not

abort an Erase operation when issued while in

Erase Suspend.

Auto Select Command. The Auto Select com-

mand is used to read the Manufacturer Code, the

Device Code and the Block Protection Status.

Three consecutive Bus Write operations are re-

quired to issue the Auto Select command. Once

the Auto Select command is issued the memory

remains in Auto Select mode until a Read/Reset

command is issued. Read CFI Query and Read/

Reset commands are accepted in Auto Select

mode, all other commands are ignored.

From the Auto Select mode the Manufacturer

Code can be read using a Bus Read operation

with A0 = VIL and A1 = VIL. The other address bits

may be set to either VIL or VIH. The Manufacturer

Code for STMicroelectronics is 0020h.

The Device Code can be read using a Bus Read

operation with A0 = VIH and A1 = VIL. The other

address bits may be set to either VIL or VIH.

The Block Protection Status of each block can be

read using a Bus Read operation with A0 = VIL,

A1 = VIH, and A12-A18 specifying the address of

the block. The other address bits may be set to ei-

ther VIL or VIH. If the addressed block is protected

then 01h is output on Data Inputs/Outputs DQ0-

DQ7, otherwise 00h is output.

Program Command. The

Program

command

can be used to program a value to one address in

the memory array at a time. The command re-

quires four Bus Write operations, the final write op-

eration latches the address and data in the internal

state machine and starts the Program/Erase Con-

troller.

If the address falls in a protected block then the

Program command is ignored, the data remains

unchanged. The Status Register is never read and

no error condition is given.

During the program operation the memory will ig-

nore all commands. It is not possible to issue any

command to abort or pause the operation. Typical

program times are given in Table 6. Bus Read op-

erations during the program operation will output

the Status Register on the Data Inputs/Outputs.

See the section on the Status Register for more

details.

After the program operation has completed the

memory will return to the Read mode, unless an

error has occurred. When an error occurs the

Operation

Address Inputs

A0-A18

Data Inputs/Outputs

DQ15A–1, DQ14-DQ0

Bus Read

VIL

VIH

Cell Address

Data Output

Bus Write

VIL

VIH

VIL

Command Address

Data Input

Output Disable

VIH

Hi-Z

Standby

VIH

Hi-Z

Read Manufacturer

Code

VIL

VIH

A0 = VIL, A1 = VIL, A9 = VID,

Others VIL or VIH

0020h

Read Device Code

VIL

VIH

A0 = VIH, A1 = VIL, A9 = VID,

Others VIL or VIH

22ECh (M29F800DT)

2258h (M29F800DB)

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