S29AL008D55BAI011 datasheet(11/55 Pages) SPANSION

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June 16, 2005 S29AL008D_00A3

S29AL008D

Da t a

S h ee t

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 com-

posed 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 1 lists the device bus operations, the inputs and con-

trol levels they require, and the resulting output. The following subsections

describe each of these operations in further detail.

Legend:

L = Logic Low = VIL, H = Logic High = VIH, VID = 12.0 ± 0.5 V, X = Don’t Care, AIN = Address In, DIN = Data In, DOUT = Data Out

Notes:

1. Addresses are A18:A0 in word mode (BYTE# = VIH), A18:A-1 in byte mode (BYTE# = VIL).

2. The sector protect and sector unprotect functions may also be implemented via programming equipment. See the

Sector Protection/Unprotection, on page 16.

Word/Byte Configuration

The BYTE# pin controls whether the device data I/O pins DQ15–DQ0 operate in

the byte or word configuration. If the BYTE# pin is set at logic 1, the device is in

word configuration, DQ15–DQ0 are active and controlled by CE# and OE#.

If the BYTE# pin is set at logic 0, the device is in byte configuration, and only data

I/O pins DQ0–DQ7 are active and controlled by CE# and OE#. The data I/O pins

DQ8–DQ14 are tri-stated, and the DQ15 pin is used as an input for the LSB (A-1)

address function.

Requirements for Reading Array Data

To read array data from the outputs, the system must drive the CE# and OE#

pins to VIL. CE# is the power control and selects the device. OE# is the output

control and gates array data to the output pins. WE# should remain at VIH. The

BYTE# pin determines whether the device outputs array data in words or bytes.

Table 1. S29AL008D Device Bus Operations

Operation

CE# OE# WE# RESET#

Addresses

(Note 1)

DQ0–

DQ7

DQ8–DQ15

BYTE#

= VIH

BYTE#

= VIL

Read

AIN

DOUT

DOUT DQ8–DQ14 = High-Z,

DQ15 = A-1

Write

AIN

DIN

Standby

VCC ±

0.3 V

VCC ±

0.3 V

High-Z High-Z

High-Z

Output Disable

High-Z High-Z

High-Z

Reset

High-Z High-Z

High-Z

Sector Protect (Note 2)

VID

Sector Address,

A6 = L, A1 = H,

A0 = L

DIN

Sector Unprotect (Note 2)

VID

Sector Address,

A6 = H, A1 = H,

A0 = L

DIN

Temporary Sector Unprotect

VID

AIN

DIN

High-Z

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