AM29DL642G datasheet(19/54 Pages) AMD

19 / 54 page

June 10, 2005

Am29DL642G

PRELIMINARY

Table 4.

Bank Address

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 V

ID 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 2). 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 Am29DL642G is erased or programmed in a

system without access to high voltage on the A9 pin.

The command sequence is illustrated in Table 13.

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 from that bank and then immediately

read array data from the other bank, without exiting the

autoselect mode.

Bank 4

SA119

1110000xxx

380000h–387FFFh

SA120

1110001xxx

388000h–38FFFFh

SA121

1110010xxx

390000h–397FFFh

SA122

1110011xxx

398000h–39FFFFh

SA123

1110100xxx

3A0000h–3A7FFFh

SA124

1110101xxx

3A8000h–3AFFFFh

SA125

1110110xxx

3B0000h–3B7FFFh

SA126

1110111xxx

3B8000h–3BFFFFh

SA127

1111000xxx

3C0000h–3C7FFFh

SA128

1111001xxx

3C8000h–3CFFFFh

SA129

1111010xxx

3D0000h–3D7FFFh

SA130

1111011xxx

3D8000h–3DFFFFh

SA131

1111100xxx

3E0000h–3E7FFFh

SA132

1111101xxx

3E8000h–3EFFFFh

SA133

1111110xxx

3F0000h–3F7FFFh

SA134

1111111000

3F8000h–3F8FFFh

SA135

1111111001

3F9000h–3F9FFFh

SA136

1111111010

3FA000h–3FAFFFh

SA137

1111111011

3FB000h–3FBFFFh

SA138

1111111100

3FC000h–3FCFFFh

SA139

1111111101

3FD000h–3FDFFFh

SA140

1111111110

3FE000h–3FEFFFh

SA141

1111111111

3FF000h–3FFFFFh

Table 3.

Am29DL642G Sector Architecture for CE2# (Continued)

Bank

Sector

Sector Address

A21–A12

Sector Size

(Kwords)

(x16)

Address Range

Bank

A21–A19

000

001, 010, 011

100, 101, 110

111

Device

Sector Size

(x16)

Address Range

Am29DL642G

128 words

00000h–0007Fh

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