M29F080A datasheet(5/21 Pages) STMICROELECTRONICS

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M29F080A

Table 4. Bus Operations

Note: X = VIL or VIH.

Operation

Address Inpu ts

Data

Inputs/Outpu ts

Bus Read

VIL

VIH

Cell Address

Data Output

Bus Write

VIL

VIH

VIL

Command Address

Data Input

Output Disable

XVIH

VIH

XHi-Z

Standby

VIH

Hi-Z

Read Manufacturer

Code

VIL

VIH

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

Others VIL or VIH

20h

Read Device Code

VIL

VIH

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

Others VIL or VIH

F1h

Output Disable. The Data Inputs/Outputs are in

the high impedance state when Output Enable is

High, VIH.

Standby. When Chip Enable is High, VIH, the

Data Inputs/Outputs pins are placed in the high-

impedance state and the Supply Current is re-

duced to the Standby level.

When Chip Enable is at VIH the Supply Current is

reduced to the TTL Standby Supply Current, ICC2.

To further reduce the Supply Current to the CMOS

Standby Supply Current, ICC3, Chip Enable should

be held within VCC ± 0.2V. For Standby current

levels see Table 10, DC Characteristics.

During program or erase operations the memory

will continue to use the Program/Erase Supply

Current, ICC4, for Program or Erase operations un-

til the operation completes.

Automatic Standby. If CMOS levels (VCC ± 0.2V)

are used to drive the bus and the bus is inactive for

150ns or more the memory enters Automatic

Standby where the internal Supply Current is re-

duced to the Standby Supply Current, ICC3. The

Data Inputs/Outputs will still output data if a Bus

Read operation is in progress.

Special Bus Operations

Additional bus operations can be performed to

read the Electronic Signature and also to apply

and remove Block Protection. These bus opera-

tions are intended for use by programming equip-

ment and are not usually used in applications.

They require VID to be applied to some pins.

Electronic Signature. The

memory

has

two

codes, the manufacturer code and the device

code, that can be read to identify the memory.

These codes can be read by applying the signals

listed in Table 4, Bus Operations.

Block Protection and Blocks Unprotection. Blocks

can be protected in groups against accidental Pro-

gram or Erase. See Table 3, Block Addresses, for

details of which blocks must be protected together

as a group. Protected blocks can be unprotected

to allow data to be changed. Block Protection and

Block Unprotection operations must only be per-

formed on programming equipment.

For further information refer to Application Note

AN1122, Applying Protection and Unprotection to

M29 Series Flash.

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