Document Number: 002-01122 Rev.*L

Page 10 of 59

S29AS016J

7.

Device Bus Operations

This section describes the requirements and use of the device bus operations, which are initiated through the internal command

register. The command register itself does not occupy any addressable memory location. The register is composed of latches that

store the commands, along with the address and data information needed to execute the command. The contents of the register

serve as inputs to the internal state machine. The state machine outputs dictate the function of the device. Table lists the device bus

operations, the inputs and control levels they require, and the resulting output. The following subsections describe each of these

operations in further detail.

Legend

Notes

2. The sector group protect and sector group unprotect functions may also be implemented via programming equipment. See Sector Group Protection/Unprotection

on page 16.

protected or unprotected.

S29AS016J Device Bus Operations

Operation

CE#

OE

#

WE

#

RESET

#WP#

Addresses

(Note 1)

DQ0–

DQ7

DQ8–DQ15

BYTE

#

BYTE#

Read

L

L

H

H

X

DQ8–DQ14 = High-Z, DQ15 = A-1

Write (Program/

Erase)

LH

L

H

(Note

3)

Standby

 0.2

V

XX

0.2 V

HX

High-

Z

High-

Z

High-Z

Output Disable

L

H

H

H

X

X

High-

Z

High-

Z

High-Z

Reset

X

X

X

L

X

X

High-

Z

High-

Z

High-Z

Sector Group

Protect (Note 2)

LH

L

X

Sector Address,

A6 = L, A3 = A2

= L, A1 = H, A0 =

L

XX

Sector

GroupUnprotect

(Note 2)

LH

L

H

Sector Address,

A6 = H, A3 = A2

= L, A1 = H, A0 =

L

XX

Temporary Sector

Group Unprotect

XX

X

High-Z