AM29F016D-120SC Просмотр технического описания (PDF) - Advanced Micro Devices

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AM29F016D-120SC

16 Megabit (2 M x 8-Bit) CMOS 5.0 Volt-only, Uniform Sector Flash Memory

Advanced Micro Devices 

Autoselect Mode

The autoselect mode provides manufacturer and de-

vice identification, and sector protection verification,

through identifier codes output on DQ7–DQ0. This

mode is primarily intended for programming equipment

to automatically match a device to be programmed with

its corresponding programming algorithm. However,

the autoselect codes can also be accessed in-system

through the command register.

When using programming equipment, the autoselect

mode requires VID (11.5 V to 12.5 V) on address pin

A9. Address pins A6, A1, and A0 must be as shown in

Autoselect Codes (High Voltage Method) table. In addi-

tion, when verifying sector protection, the sector ad-

dress must appear on the appropriate highest order

address bits. Refer to the corresponding Sector Ad-

dress Tables. The Command Definitions table shows

the remaining address bits that are don’t care. When all

necessary bits have been set as required, the program-

ming equipment may then read the corresponding

identifier code on DQ7–DQ0.

To access the autoselect codes in-system, the host

system can issue the autoselect command via the

command register, as shown in the Command Defini-

tions table. This method does not require VID. See

“Command Definitions” for details on using the autose-

lect mode.

Table 3. Am29F016D Autoselect Codes (High Voltage Method)

Description

Manufacturer ID:

AMD

Device ID:

Am29F016D

Sector Group

Protection

Verification

CE# OE# WE# A20-A18 A17-A10 A9 A8-A7 A6 A5-A2 A1 A0

L LH

X

X

VID

X

VIL

X

VIL VIL

L LH

X

X

VID

X

VIL

X

VIL VIH

Sector

L L H Group

X

VID

X

VIL

X

VIH VIL

Address

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

DQ7-DQ0

01h

ADh

01h (protected)

00h (unprotected)

Sector Group Protection/Unprotection

The hardware sector group protection feature dis-

ables both program and erase operations in any sec-

tor group. Each sector group consists of four adjacent

sectors. Table 4 shows how the sectors are grouped,

and the address range that each sector group con-

tains. The hardware sector group unprotection fea-

ture re-enables both program and erase operations in

previously protected sector groups.

Sector group protection/unprotection must be imple-

mented using programming equipment. The procedure

requires a high voltage (VID) on address pin A9 and the

control pins. Details on this method are provided in a

supplement, publication number 23922. Contact an

AMD representative to obtain a copy of the appropriate

document. Note that the sector group protection and

unprotection scheme differs from that used with the

previous versions of this device, namely the

Am29F016B and Am29F016.

The device is shipped with all sector groups unpro-

tected. AMD offers the option of programming and pro-

tecting sector groups at its factory prior to shipping the

device through AMD’s ExpressFlash™ Service. Con-

tact an AMD representative for details.

It is possible to determine whether a sector group is

protected or unprotected. See “Autoselect Mode” for

details.

Table 4. Sector Group Addresses

Sector

Group

A20

A19

A18

Sectors

SGA0

0

0

0

SA0–SA3

SGA1

0

0

1

SA4–SA7

SGA2

0

1

0

SA8–SA11

SGA3

0

1

1

SA12–SA15

SGA4

1

0

0

SA16–SA19

SGA5

1

0

1

SA20–SA23

SGA6

1

1

0

SA24–SA27

SGA7

1

1

1

SA28–SA31

Temporary Sector Group Unprotect

This feature allows temporary unprotection of previ-

ously protected sector groups to change data in-sys-

tem. The Sector Group Unprotect mode is activated

by setting the RESET# pin to VID. During this mode,

formerly protected sector groups can be programmed

or erased by selecting the sector group addresses.

12

Am29F016D

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