AM29LL800BB-150SI 데이터 시트보기 (PDF) - Advanced Micro Devices

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AM29LL800BB-150SI

8 Megabit (1 M x 8-Bit/512 K x 16-Bit) CMOS 2.2 Volt-only Boot Sector Flash Memory

Advanced Micro Devices 

ADVANCE INFORMATION

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 on address pin A9. Address pins A6,

A1, and A0 must be as shown in Table 4. In addition,

when verifying sector protection, the sector address

must appear on the appropriate highest order address

bits (see Tables 2 and 3). Table 4 shows the remaining

address bits that are don’t care. When all necessary bits

have been set as required, the programming 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 Table 5. This method

does not require VID. See “Command Definitions” for

details on using the autoselect mode.

Table 4. Am29LL800B Autoselect Codes (High Voltage Method)

Description

A18 A11

A8

A5

DQ8

to to

to

to

to

Mode CE# OE# WE# A12 A10 A9 A7 A6 A2 A1 A0 DQ15

DQ7

to

DQ0

Manufacturer ID: AMD

L L H X X VID X L X L L

X

01h

Device ID:

Word L L H

22h

EAh

Am29LL800B

X X VID X L X L H

(Top Boot Block) Byte L L H

X

EAh

Device ID:

Word L L H

22h

6Bh

Am29LL800B

(Bottom Boot

X X VID X L X L H

Byte L L H

X

6Bh

Block)

Sector Protection

Verification

L L H SA X VID X L X H L

X

01h protected

X 00h unprotected

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

Sector Protection/Unprotection

The hardware sector protection feature disables both

program and erase operations in any sector. The hard-

ware sector unprotection feature re-enables both pro-

gram and erase operations in previously protected

sectors. Sector protection/unprotection can be imple-

mented via two methods.

The primary method requires VID on the RESET# pin

only, and can be implemented either in-system or via

programming equipment. Figure 2 shows the algo-

rithms and Figure 24 shows the timing diagram. This

method uses standard microprocessor bus cycle tim-

ing. For sector unprotect, all unprotected sectors must

first be protected prior to the first sector unprotect write

cycle.

The alternate method intended only for programming

equipment requires VID on address pin A9 and OE#.

This method is compatible with programmer routines

written for earlier 3.0 volt-only AMD flash devices. Pub-

lication number 21466 contains further details; contact

an AMD representative to request a copy.

The device is shipped with all sectors unprotected.

AMD offers the option of programming and protecting

sectors at its factory prior to shipping the device

through AMD’s ExpressFlash™ Service. Contact an

AMD representative for details.

It is possible to determine whether a sector is protected

or unprotected. See “Autoselect Mode” for details.

Temporary Sector Unprotect

This feature allows temporary unprotection of previ-

ously protected sectors to change data in-system. The

Sector Unprotect mode is activated by setting the RE-

SET# pin to VID. During this mode, formerly protected

sectors can be programmed or erased by selecting the

sector addresses. Once VID is removed from the RE-

SET# pin, all the previously protected sectors are

protected again. Figure 3 shows the algorithm, and

Figure 23 shows the timing diagrams, for this feature.

Am29LL800B

11

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