M29W640DB datasheet(11/49 Pages) STMICROELECTRONICS

11 / 49 page

11/49

M29W640DT, M29W640DB

Note: X = VIL or VIH.

Table 3. Bus Operations, BYTE = VIH

Note: X = VIL or VIH.

Read Device Code

VIL

VIH

A0 = VIH, A1 = VIL,

A9 = VID, Others VIL or VIH

Hi-Z

DEh (M29W640DT)

DFh (M29W640DB)

Extended Memory

Block Verify Code

VIL

VIH

A0 = VIH, A1 = VIH, A6 = VIL,

A9 = VID, Others VIL or VIH

Hi-Z

M29W640DT

98h (factory locked)

18h (not factory locked)

M29W640DB

88h (factory locked)

08h (not factory locked)

Operation

Address Inputs

A0-A21

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

22DEh (M29W640DT)

22DFh (M29W640DB)

Extended Memory

Block Verify Code

VIL

VIH

A0 = VIH, A1 = VIH, A6 = VIL,

A9 = VID, Others VIL or VIH

M29W640DT

98h (factory locked)

18h (not factory locked)

M29W640DB

88h (factory locked)

08h (not factory locked)

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