AM29LV008T-120FC データシートの表示（PDF） - Advanced Micro Devices

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AM29LV008T-120FC

8 Megabit (1,048,576 x 8-Bit) CMOS 3.0 Volt-only, Sectored Flash Memory

Advanced Micro Devices 

PRELIMINARY

Autoselect

The Autoselect mode allows the reading out of a binary

code from the device and will identify its manufacturer

and type. The intent is to allow programming equipment

to automatically match the device to be programmed

with its corresponding programming algorithm. The Au-

toselect command may also be used to check the sta-

tus of write-protected sectors (see Table 2). This mode

is functional over the entire temperature range of the

device.

To activate this mode, the programming equipment

must force VID (12.0 V ± 5%) on address pin A9. Two

identifier bytes may then be sequenced from the device

outputs by toggling address A0 from VIL to VIH. All ad-

dresses are don’t cares except A0, A1, and A6 see

Table 2.

The manufacturer and device codes may also be read

via the command register, for instances when the

Am29LV008 is erased or programmed in a system with-

out access to high voltage on the A9 pin. The command

sequence is illustrated in Table 5 on page 13.

Byte 0 (A0 = VIL) represents the manufacturer’s code

and byte 1 (A0 = VIH) the device identifier code. For the

Am29LV008 these two bytes are given in Table 2. All

identifiers for manufacturer and device will exhibit odd

parity with DQ7 defined as the parity bit. In order to

read the proper device codes when executing Autose-

lect, A1 must be VIL (see Table 2). The device code is

3EH (for top boot block) or 37H (for bottom boot block).

In order to determine which sectors are write protected,

A1 must be at VIH while running through the sector ad-

dresses; if the selected sector is protected, a logical ‘1’

will be output on DQ0 (DQ0 = 1).

Table 2. Autoselect/Sector Protection Codes

Type

Code DQ DQ DQ DQ DQ DQ DQ DQ

A13–A19 A6 A1 A0 (HEX) 7 6 5 4 3 2 1 0

Manufacturer Code: AMD

X

LLL

01H

00000001

29LV008 Device

(Top Boot Block)

X

L LH

3EH

00111110

29LV008 Device

(Bottom Boot Block)

X

L LH

37H

00110111

Sector Protection

Set Sector

Addresses

L

H

L

01H*

00000001

X = Don’t care.

* Outputs 01H at protected sector addresses.

Am29LV008T/Am29LV008B

9

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