6

P/N:PM0556

REV. 0.6, DEC. 09, 1998

MX29F022T/B

TABLE 2. MX29F022T/B BUS OPERATION

Pins

CE

OE

WE

A0

A1

A6

A9

Q0~Q7

Mode

Read Silicon ID

L

L

H

L

L

X

V

C2H

Manfacturer Code(1)

Read Silicon ID

L

L

H

H

L

X

V

36H/37H

Device Code(1)

Read

L

L

H

A0

A1

A6

A9

D

OUT

Standby

H

X

X

X

X

X

X

HIGH Z

Output Disable

L

H

H

X

X

X

X

HIGH Z

Write

L

H

L

A0A1

A6A9

D

Chip Protect with 12V

L

V

L

X

X

L

V

X

system(6)

Chip Unprotect with 12V

L

V

L

X

X

H

V

X

system(6)

Verify chip Protect

L

L

H

X

H

X

V

Code(5)

with 12V system

Chip Protect without 12V

L

H

L

X

X

L

H

X

system (6)

Chip Unprotect without 12V

L

H

L

X

X

H

H

X

system (6)

Verify Chip Protect/Unprotect

L

L

H

X

H

X

H

Code(5)

without 12V system (7)

Reset

X

X

X

X

X

X

X

HIGH Z

NOTES:

1. Manufacturer and device codes may also be accessed via a command register write sequence. Refer to Table 1.

2. VID is the Silicon-ID-Read high voltage, 11.5V to 12.5V.

3. Refer to Table 1 for valid Data-In during a write operation.

4. X can be VIL or VIH.

5. Code=00H means unprotected.

Code=01H means protected.

6. Refer to chip protect/unprotect algorithm and waveform.

Must issue "unlock for chip protect/unprotect" command before "chip protect/unprotect without 12V system" command.

7. The "verify chip protect/unprotect without 12V sysytem" is only following "chip protect/unprotect without 12V system"

command.

INDEX