M29F800DT70M6E データシートの表示（PDF） - STMicroelectronics

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M29F800DT70M6E

8 Mbit (1Mb x8 or 512Kb x16, Boot Block) 5V Supply Flash Memory

STMicroelectronics 

M29F800DT

Bus operations

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

E

G

W

Address Inputs

DQ15A–1, A0-A18

Data Inputs/Outputs

DQ14-DQ8

DQ7-DQ0

Bus Read

VIL VIL VIH Cell address

Bus Write

VIL VIH VIL Command address

Output Disable

X

VIH VIH X

Standby

VIH

X

XX

Read Manufacturer Code VIL

VIL

VIH

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

Others VIL or VIH

Read Device Code

VIL

VIL

VIH

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

Others VIL or VIH

1. X = VIL or VIH.

Table 3. Bus operations, BYTE = VIH(1)

Operation

E

G

W

Address Inputs

A0-A18

Hi-Z

Data Output

Hi-Z

Data Input

Hi-Z

Hi-Z

Hi-Z

Hi-Z

Hi-Z

20h

ECh (M29F800DT)

Hi-Z

58h (M29F800DB)

Data Inputs/Outputs

DQ15A–1, DQ14-DQ0

Bus Read

Bus Write

Output Disable

Standby

Read Manufacturer Code

Read Device Code

1. X = VIL or VIH.

VIL VIL VIH Cell address

VIL VIH VIL Command address

X

VIH VIH X

VIH

X

XX

VIL

VIL

VIH

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

Others VIL or VIH

VIL

VIL

VIH

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

Others VIL or VIH

Data Output

Data Input

Hi-Z

Hi-Z

0020h

22ECh (M29F800DT)

2258h (M29F800DB)

15/53

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