AM41PDS3228DB10IS datasheet(25/59 Pages) AMD

25 / 59 page

Am41PDS3228D

May 13, 2002

P R E L IMINARY

Figure 3.

Unlock Bypass Algorithm

The device offers accelerated program operations

through the WP#/ACC pin. When the system asserts

HH on the WP#/ACC pin, the device automatically en-

ters the Unlock Bypass mode. The system may then

write the two-cycle Unlock Bypass program command

sequence. The device uses the higher voltage on the

WP#/ACC pin to accelerate the operation. Note that

the WP#/ACC pin must not be at V

HH any operation

other than accelerated programming, or device dam-

age may result. In addition, the WP#/ACC pin must not

be left floating or unconnected; inconsistent behavior

of the device may result.

Figure 4 illustrates the algorithm for the program oper-

ation. Refer to the Flash Erase and Program Opera-

tions table in the AC Characteristics section for

parameters, and Figure 18 for timing diagrams.

Note: See Table 10 for program command sequence.

Figure 4.

Program Operation

Chip Erase Command Sequence

Chip erase is a six bus cycle operation. The chip erase

command sequence is initiated by writing two unlock

cycles, followed by a set-up command. Two additional

unlock write cycles are then followed by the chip erase

command, which in turn invokes the Embedded Erase

algorithm. The device does not require the system to

preprogram prior to erase. The Embedded Erase algo-

rithm automatically preprograms and verifies the entire

memory for an all zero data pattern prior to electrical

erase. The system is not required to provide any con-

trols or timings during these operations. Table 10

shows the address and data requirements for the chip

erase command sequence.

Start

555h/AAh

2AAh/55h

XXXh/A0h

555h/20h

Verify Byte?

Program Address/Program Data

Data# Polling Device

Last Address

Programming Completed

(BA) XXXh/90h

XXXh/00h

Increment

Address

Yes

Set

Unlock

Bypass

Mode

Unlock

Bypass

Program

Reset

Unlock

Bypass

Mode

START

Write Program

Command Sequence

Data Poll

from System

Verify Data?

Yes

Last Address?

Yes

Programming

Completed

Increment Address

Embedded

Program

algorithm

in progress

AM41PDS3228DB10IS Datasheet(PDF) 25 Page - Advanced Micro Devices

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