M49000000G datasheet(19/64 Pages) AMD

19 / 64 page

Am49DL320BG

June 25, 2002

P R E L I M I NARY

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-

m e nt to au tom a ti ca l l y m a tch a d e vi ce to b e

programmed with its corresponding programming al-

gorithm. However, the autoselect codes can also be

accessed in-system through the command register.

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 V

ID. Refer to the Autoselect Com-

mand Sequence section for more information.

Sector/Sector Block Protection and

Unprotection

(Note: For the following discussion, the term “sector”

applies to both sectors and sector blocks. A sector

block consists of two or more adjacent sectors that are

protected or unprotected at the same time (see Table

7).

Table 7.

Top Boot Sector/Sector Block Addresses

for Protection/Unprotection

Sector

A20–A12

Sector/

Sector Block Size

SA0

000000XXX

64 Kbytes

SA1–SA3

000001XXX,

000010XXX

000011XXX

192 (3x64) Kbytes

SA4–SA7

0001XXXXX

256 (4x64) Kbytes

SA8–SA11

0010XXXXX

256 (4x64) Kbytes

SA12–SA15

0011XXXXX

256 (4x64) Kbytes

SA16–SA19

0100XXXXX

256 (4x64) Kbytes

SA20–SA23

0101XXXXX

256 (4x64) Kbytes

SA24–SA27

0110XXXXX

256 (4x64) Kbytes

SA28–SA31

0111XXXXX

256 (4x64) Kbytes

SA32–SA35

1000XXXXX

256 (4x64) Kbytes

SA36–SA39

1001XXXXX

256 (4x64) Kbytes

SA40–SA43

1010XXXXX

256 (4x64) Kbytes

SA44–SA47

1011XXXXX

256 (4x64) Kbytes

SA48–SA51

1100XXXXX

256 (4x64) Kbytes

SA52–SA55

1101XXXXX

256 (4x64) Kbytes

SA56–SA59

1110XXXXX

256 (4x64) Kbytes

SA60–SA62

111100XXX,

111101XXX,

111110XXX

192 (4x64) Kbytes

SA63

111111000

8 Kbytes

SA64

111111001

8 Kbytes

SA65

111111010

8 Kbytes

SA66

111111011

8 Kbytes

SA67

111111100

8 Kbytes

SA68

111111101

8 Kbytes

SA69

111111110

8 Kbytes

SA70

111111111

8 Kbytes

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