M29F800DT datasheet(15/53 Pages) STMICROELECTRONICS

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M29F800DT

Bus operations

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3.0.6

Special bus operations

Additional bus operations can be performed to read the Electronic Signature and also to apply and

remove Block Protection. These bus operations are intended for use by programming equipment and are

not usually used in applications. They require VID to be applied to some pins.

3.0.7

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 2: Bus operations, BYTE = VIL,

and Table 3: Bus operations, BYTE = VIH.

3.0.8

Block Protection and Blocks Unprotection

Each block can be separately protected against accidental Program or Erase. Protected blocks can be

unprotected to allow data to be changed.

There are two methods available for protecting and unprotecting the blocks, one for use on programming

equipment and the other for in-system use. Block Protect and Chip Unprotect operations are described in

Appendix C.

Table 2.

Bus operations, BYTE = VIL

(1)

Operation

Address Inputs

DQ15A–1, A0-A18

Data Inputs/Outputs

DQ14-DQ8

DQ7-DQ0

Bus Read

VIL

VIH

Cell address

Hi-Z

Data Output

Bus Write

VIL

VIH

VIL

Command address

Hi-Z

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

Hi-Z

20h

Read Device Code

VIL

VIH

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

Others VIL or VIH

Hi-Z

ECh (M29F800DT)

58h (M29F800DB)

X = VIL or VIH.

Table 3.

Bus operations, BYTE = VIH

(1)

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

XHi-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)

X = VIL or VIH.

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