AM29PDL128G datasheet(22/71 Pages) AMD

22 / 71 page

October 28, 2004

Am29PDL128G

P R E L IM IN A R Y

Table 6.

SecSi

™ Sector Addresses

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 equip-

ment to automatically match a device to be pro-

grammed with its c o rresponding progra mm ing

algorithm. However, the autoselect codes can also be

accessed in-system through the command register.

When using programming equipment, the autoselect

mode requires V

ID on address pin A9. Address pins

must be as shown in Table 7. In addition, when verify-

ing sector protection, the sector address must appear

on the appropriate highest order address bits (see

Table 5). Table 7 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.

However, the autoselect codes can also be accessed

in-system through the command register, for instances

when the device is erased or programmed in a system

without access to high voltage on the A9 pin. The com-

mand sequence is illustrated in Table 14 and Table 16.

Note that if a Bank Address (BA) on address bits A21,

A20, and A19 is asserted during the third write cycle of

the autoselect command, the host system can read

autoselect data that bank and then immediately read

array data from the other bank, without exiting the au-

toselect mode.

To access the autoselect codes in-system, the host

system can issue the autoselect command via the

command register, as shown in Table 16. This method

does not require V

ID. Refer to “Autoselect Command

Sequence” for more information.

Table 7.

Autoselect Codes (High Voltage Method)

Legend: L = Logic Low = V

IL, H = Logic High = VIH, BA = Bank Address, SA = Sector Address, X = Don’t care.

Note: The autoselect codes may also be accessed in-system via command sequences.

Device

Sector Size

(x32)

Address Range

(x16)

Address Range

Am29PDL128G

128 words/64 double

words

000000h–00003Fh

000000h–00007Fh

Description

CE# OE# WE#

A21

A11

A10

DQ31 to DQ8

(Word/Double

Word)

DQ7

to DQ0

Manufacturer ID:

AMD

000000h

01h

Read

Cycle 1

22h/

222222h

7Eh

Read

Cycle 2

22h/

222222h

0Dh

Read

Cycle 3

22h/

222222h

00h

Sector Protection

Verification

00h/

000000h

01h (protected),

00h (unprotected)

SecSi Indicator Bit

(DQ7)

00h/

000000h

80h

(factory locked),

00h (not factory

locked)

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