S29CD032J datasheet(21/76 Pages) SPANSION

21 / 76 page

September 27, 2006 S29CD-J_CL-J_00_B1

S29CD-J & S29CL-J Flash Family

Da ta

Shee t

(Prelim i nar y )

Device Operations

This section describes the read, program, erase, simultaneous read/write operations, and reset features of

the Flash devices.

Operations are initiated by writing specific commands or a sequence with specific address and data patterns

into the command register (see Table 8.1). The command register itself does not occupy any addressable

memory location; rather, it 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 input to the internal state

machine; the state machine outputs dictate the function of the device. Writing incorrect address and data

values or writing them in an improper sequence may place the device in an unknown state, in which case the

system must write the reset command in order to return the device to the reading array data mode.

8.1

Device Operation Table

The device must be set up appropriately for each operation. Table 8.1 describes the required state of each

control pin for any particular operation.

Legend

L = Logic Low = VIL, H = Logic High = VIH, X = Don’t care.

Notes

1. WP# controls the two outermost sectors of the top boot block or the two outermost sectors of the bottom boot block.

2. DQ0 reflects the sector PPB (or sector group PPB) and DQ1 reflects the DYB.

Table 8.1 Device Bus Operation

Operation

CE#

OE#

WE#

RESET#

CLK

ADV#

Addresses

Data

(DQ0–DQ31)

Read

AIN

DOUT

Asynchronous Write

AIN

DIN

Synchronous Write

AIN

DIN

Standby (CE#)

HIGH Z

Output Disable

HIGH Z

Reset

HIGH Z

PPB Protection Status (Note 2)

Sector Address,

A9 = VID,

A7 – A0 = 02h

00000001h, (protected)

A6 = H

00000000h (unprotect)

A6 = L

Burst Read Operations

Load Starting Burst Address

AIN

Advance Burst to next address

with appropriate Data presented

on the Data bus

Burst Data Out

Terminate Current Burst Read Cycle

HIGH Z

Terminate Current Burst

Read Cycle with RESET#

HIGH Z

Terminate Current Burst Read Cycle;

Start New Burst Read Cycle

AIN

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