AM29PDL127H datasheet(23/68 Pages) AMD

23 / 68 page

June 07, 2005

Am29PDL127H

P RE L I M I NARY

Table 5.

SecSiTM 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 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

must be as shown in Table 6. In addition, when verify-

ing sector protection, the sector address must appear

on the appropriate highest order address bits (see

Table 4). Table 6 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 13. Note that if a

Bank Address (BA) on address bits A22

–A20 is as-

serted 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 autoselect mode.

To access the autoselect codes in-system, the host

system can issue the autoselect command via the

command register, as shown in Table 13. This method

does not require VID. Refer to the Autoselect Com-

mand Sequence section for more information.

Sector Size

Address Range

Am29PDL127H

128 words

000000h–00007Fh

Factory-Locked Area

64 words

000000h-00003Fh

Customer-Lockable Area

64 words

000040h-00007Fh

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