AS29LV016 Просмотр технического описания (PDF) - Austin Semiconductor

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AS29LV016

16 Megabit (2M x 8-Bit / 1M x 16-Bit) CMOS 3.0 Volt-Only Boot Sector Flash Memory

Austin Semiconductor 

COTS PEM

BOOT SECTOR FLASH

Austin Semiconductor, Inc.

AS29LV016

AUTOSELECT MODE

The autoselect mode provides manufacturer and device

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.

In addition, when verifying sector protection, the sector

address must appear on the appropriate highest order

address bits (see Table 2 on page 9 and Table 3 on

page 10). Table 4, immediately below, 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.

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 Table 4 below.

Table 4: AS29LV016 Autoselect Codes (High Voltage Method)

To access the autoselect codes in-system, the host

system can issue the autoselect command via the

command register, as shown in Table 9 on page 21. This

method does not require VID. See Command Definitions

on page 17 for details on using the autoselect mode.

Description

Mode CE#

OE#

WE#

A19 to A11 to

A12 A10

A9

A8 to

A7

A6

A5 to A3 to

A4 A2

A1

Manufacturer ID: Spansion

L

L

H

X

X

VID

X

L

X

L

L

Device ID: S29AL016D

(Top Boot Block)

Word L

Byte L

L

H

L

H

X

X

X

X

VID

X

L

X

L

L

Device ID: S29AL016D

(Bottom Boot Block)

Word L

Byte L

L

H

L

H

X

X

X

X

VID

X

L

X

L

L

Sector Protection Verification

L

L

H

SA

X

VID

X

L

X

L

H

L= Logic Low = V IL , H=Logic High=V IH , SA = Sector Address, X=Don't Care

Note: The autoselect codes may also be accessed in-system via command sequences. See Table 9 on page 21.

A0

DQ8 to

DQ15

DQ7 to DQ0

L

X

01h

H

22h

C4h

X

C4h

H

22h

X

49h

49h

L

X

01h (protected)

X 00h (unprotected)

SECTOR PROTECTION / UNPROTECTION

The hardware sector protection feature disables both

program and erase operations in any sector. The hardware

sector unprotection feature re-enables both program and

erase operations in previously protected sectors.

The device is shipped with all sectors unprotected.

It is possible to determine whether a sector is protected

or unprotected. See Autoselect Mode above for details.

Sector protection/unprotection can be implemented 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, on page 13 shows the

algorithms and Figure 22, on page 36 shows the timing

diagram. This method uses standard microprocessor bus

cycle timing. 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 V on address pin A9 and OE#.

ID

AS29LV016

Rev. 2.1 10/08

11

Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.

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