25538A1 [ETC]

Migrating from Single-byte to Three-byte Device IDs ; 从单字节迁移到三字节设备ID\n


型号：	25538A1
厂家：	ETC
描述：	Migrating from Single-byte to Three-byte Device IDs 从单字节迁移到三字节设备ID\n
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中文：	中文翻译
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Migrating from Single-byte to Three-

byte Device IDs

Application Note

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Publication Number 25538 Revision A Amendment +1 Issue Date November 8, 2001

Migrating from Single-byte to Three-byte

Device IDs

Application Note

Introduction

Device Codes on Older Devices

This document describes the device driver changes

necessary in order to migrate from single-byte device

IDs to three-byte device IDs. Device IDs in AMD Flash

devices are accessible either via a software command

sequence or through a high-voltage hardware method.

Because AMD has utilized all possible single-byte de-

vice codes, new devices will utilize a new three-byte

device ID changes affect customers using the

Am29BDS643D, Am29PDS322D, Am29DL640D, and

Am29PL320D devices. Specifically, device driver

changes are required in order to uniquely identify de-

vices utilizing three-byte device IDs. Future product

migrations, including those for MirrorBit devices, will

also utilize the three-byte device ID.

High-Voltage Hardware Method

The "High-Voltage Method" provides a hardware

method of reading device codes on AMD Flash de-

vices. To implement the High-Voltage Method in previ-

ous AMD devices, control pins must be held at a

specified state and voltage V is applied at Address

Pin A9. Using the High-Voltage Method, address pins

A6, A1, and A0 can be used to switch in between read-

ing the Manufacturer ID, Device ID, Sector Protection

Verification, and the SecSi Sector Indicator Bit. With

A1 held low, A0 held high, A6 held low, and V on A9,

the device code is read on the least significant eight

bits of the databus. Table 1 illustrates the hardware

settings for Device ID using the High-Voltage Method.

The illustration is based on the Am29LV641DH/L, an

example using a 16-bit data bus.

Table 1. Manufacturer and Device ID

A21:

A10

A8:

A5:

DQ15:

DQ0

Description

CE# OE# WE#

Device ID: Am29LV641D

22D7h

Note: V = 8.5 to 12.5 V

Software Command Sequence

sequence accesses the autoselect mode; where BA is

the bank address and X is don’t care.

The manufacturer and device codes for AMD devices

may also be read via the autoselect command se-

quence. The autoselect command sequence is initi-

ated by first writing two unlock cycles. This is followed

by a third write cycle that contains the bank address

and the autoselect command. The bank then enters

Bus-cycle

Address

X555

Data

X2AA

(BA) X555

the autoselect mode. The following, typical bus-cycle

The system may read at any address within the same

bank any number of times without initiating another au-

toselect command sequence. Previously, AMD device

codes consisted of a unique single-byte combination

read at address 01h within the autoselect mode. For

example, the command definition for reading the de-

vice ID from the Am29LV010B (3.0 V, 1 Mbit, uniform

1. For AMD devices offering Simultaneous Read/Write functionality, the bank

address bits identify the bank from which the device code will be read and uti-

lizes the top few bits of the address bus. For devices with only one bank, it is

unnecessary to include the bank address in the command sequence.

3. Address 02h is used in devices utilizing the A-1 line during addressing. For

example, byte-wide databus mode on x8/x16 devices utilizes the A-1 line.

Likewise, word-wide databus mode on x16/x32 devices also utilizes the A-1

line.

2. While most previous AMD devices follow this sequence, a few exception

devices differ slightly. Please consult datasheet for device-specific informa-

tion.

Publication# 25538 Rev: A Amendment/+1

Issue Date: November 8, 2001

sector device), including the autoselect command se-

quence, is as follows:

Migrating to Three-byte Device Codes

High-Voltage Hardware Method

Bus-cycle

Address

555

Data

For devices utilizing a three-byte device code, the de-

vice code may still be read via the high-voltage

method, but requires three separate reads in order to

uniquely identify the device. In addition, the reads now

require logic applied to the A3 and A0 pins, in addition

to the other device pins. Holding A3:A1 low, A0 high,

2AA

555

X01

A6 low, and A9 at V reads the first byte of the device

ID. The second byte is read by holding A3:A1 high, A0

In this example, 6Eh is the device code for the device.

Note that the bank address is not needed for this de-

vice, because it does not offer multiple banks (Simulta-

neous Read/Write).

low, A6 low, and A9 at V . The third byte of the device

code is read by holding A3:A0 high, A6 low, and A9 at

V . Table 2 describes the high-voltage method for

reading the device ID for the Am29PL320D device.

Table 2. High-Voltage Method

A19:

A10

A8:

A5:

DQ7:

DQ0

Description

Device ID Read 1

Device ID Read 2

CE#

OE# WE#

7Eh

03h

00h

(bottom

boot); 01h

(top boot)

Device ID Read 3

Note: V = 8.5 to 12.5 V

Software Command Sequence

For example, the command definition for reading the

device code from the Am29DL640D (64 Mbit, 8 M x 8-

bit/4 M x 16-bit device) in word-mode is as follows

(where BA is the Bank Address and X is don’t care):

For devices utilizing a three-byte device ID, the device

code may still be read via the autoselect command se-

quence, but will require three-sequential read cycles in

order to uniquely distinguish the device. The three

read cycles are read at addresses 01h, 0Eh, and 0Fh,

Bus-cycle

Address

555

Data

respectively. For a device utilizing the A-1 line , the

three read cycles are read at addresses 02h, 1Ch, and

1Eh. The device code 7Eh read during the first read

cycle (where the single-byte device code was read in

previous devices) now indicates that two additional

read cycles are required to completely identify the de-

vice.

2AA

(BA) 555

(BA) X01

(BA) X0E

(BA) X0F

4. See footnote 2 on page 1.

Migrating from Single-byte to Three-byte Device IDs

Likewise, the command definition for reading the

Am29DL640D in byte-mode is as follows:

Flash Device

Device ID

7E 12 01 (H, L)

Am29LV256M -

MirrorBit™

Bus-

cycle

Address

AAA

Data

Am29BDS323D D1

95 (T); 96 (B)

Am29DS163D

Am29DS323D

Am29DL400B

Am29DL800B

Am29DL161D

Am29DL162D

Am29DL163D

Am29DL164D

Am29DL322D

Am29DL323D

Am29DL324D

Am29SL800C

Am29SL160C

Am29LV200B

Am29LV400B

Am29LV800B

B7 (T); B8 (B)

0C (T); 0F (B)

4A (T); CB (B)

36 (T); 39 (B)

2D (T); 2E (B)

28 (T); 2B (B)

33 (T); 35 (B)

55 (T); 56 (B)

50 (T); 53 (B)

5C (T); 5F (B)

EA (T); 6B (B)

E4 (T); E7 (B)

3B (T); BF (B)

B9 (T); BA (B)

DA (T); 5B (B)

555

(BA) AAA

(BA) X02

(BA) X1C

(BA) X1E

Required Modifications

For devices utilizing a three-byte device ID, using only

the first read cycle of the device ID-in either the high-

voltage hardware method or in the software command

sequence-will not completely identify the device. Con-

sequently, customers utilizing the Am29BDS643D,

Am29PDS322D, Am29DL640D, and Am29PL320D

devices must update any software drivers utilizing the

software command sequence in order to reflect the up-

dated device codes. In addition, customers planning to

migrate to MirrorBit or future AMD devices should also

update any drivers as needed. Programmers utilizing

the High-Voltage Method should also update any driv-

ers as needed.

Am29LV160B/

Am29LV160D

C4 (T); 49 (B)

Am29LV320D

Am29LV001B

Am29LV002B

Am29LV004B

Am29LV008B

Am29LV116D

Am29LV010B

Am29LV040B

Am29LV081B

Am29LV017D

Am29LV033C

F6 (T); F9 (B)

ED (T); 6D (B)

40 (T); C2 (B)

B5 (T); B6 (B)

3E (T); 37 (B)

C7 (T); 4C (B)

Device ID Reference Table

Table 3 summarizes device ID combinations for AMD

Flash devices. Please refer to the datasheets posted

on www.amd.com for complete, up-to-date descrip-

tions of device codes for all AMD devices:

Table 3. AMD Flash Device IDs

Flash Device

Device ID

Am29BDS643D 7E 02 00

Am29PDS322D 7E 06 01 (T); 7E 06 00 (B)

Am29LV065D/

Am29LV652D/

Am29LV065GU

Am29DL640D

Am29PL320D

7E 02 01

7E 03 01 (T); 7E 03 00 (B)

Am29LV640D/

Am29LV641D/

Am29LV641GH/ D7

Am29LV641GL/

7E 0E 01(T); 7E 0E 00 (B); 7E 0C 00

(H, L)

Am29LV640G

Am29LV641G

7E 0F 01 (T); 7E 0F 00 (B)

Am29LV640GU

Am29LV065M -

MirrorBit™

7E 13 00 (U)

Am29F002B/

B0 (T); 34 (B)

Am29F002NB

Am29F004B

Am29F200B

Am29F400B

Am29F800B

Am29F160D

Am29LV640M -

MirrorBit™

7E 10 01 (T); 7E 10 00 (B); 7E 0C 01

(H, L); 7E 13 01 (U)

77 (T); 7B (B)

51 (T); 57 (B)

23 (T); AB (B)

D6 (T); 58 (B)

D2 (T) D8 (B)

Am29LV641M -

MirrorBit™

7E 11 01 (T); 7E 11 00 (B); 7E 13 01

(H, L)

Am29LV128M -

MirrorBit™

7E 12 00 (H, L)

Migrating from Single-byte to Three-byte Device IDs

Flash Device

Am29F010B

Am29F040B

Am29F080B

Am29F016D

Am29F017D

Am29F032B

Am29BL802C

Device ID

Flash Device

Am29BL162C

Am29PL160C

Device ID

B = Bottom Boot Device, T = Top Boot Device, U = Uniform

Sector Device (no WP#), H = Uniform Sector Device (highest

address sector protected), L = Uniform Sector Device (lowest

address sector protected)

Migrating from Single-byte to Three-byte Device IDs

REVISION SUMMARY

Revision A+1 (November 8, 2001)

Global

Revision A (September 25, 2001)

Deleted references to manufacturer ID.

Initial release.

Trademarks

AMD, the AMD logo, and combinations thereof are registered trademarks of Advanced Micro Devices, Inc.

Product names used in this publication are for identification purposes only and may be trademarks of their respective companies.

Migrating from Single-byte to Three-byte Device IDs

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