AM29DL400B datasheet(13/47 Pages) AMD

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Am29DL400B

Table 3. Am29DL400BB Bottom Boot Sector Architecture

Note: The address range is A17:A-1 if in byte mode (BYTE# = VIL). The address range is A17:A0 if in word mode (BYTE# =

VIH).

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-

me nt to automatically match a device to be

programmed with its corresponding programming al-

gorithm. However, the autoselect codes can also be

accessed in-system through the command register.

When using programming equipment, the autoselect

mode requires VID (11.5 V to 12.5 V) on address pin

A9. Address pins A6, A1, and A0 must be as shown

in Table 4. In addition, when verifying sector protec-

tion, the sector address must appear on the

appropriate highest order address bits (see Tables 2

and 3). Table 4 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.

To access the autoselect codes in-system, the host

system can issue the autoselect command via the

command register, as shown in Table 5. This method

does not require VID. Refer to the Autoselect Com-

mand Sequence section for more information.

Bank

Sector

Sector Address

Sector Size

(Kbytes/Kwords)

(x8)

Address Range

(x16)

Address Range

Bank

Address

A15 A14 A13 A12

A17 A16

Bank 2

SA13

64/32

70000h–7FFFFh

38000h–3FFFFh

SA12

64/32

60000h–6FFFFh

30000h–37FFFh

SA11

64/32

50000h–5FFFFh

28000h–2FFFFh

SA10

64/32

40000h–4FFFFh

20000h–27FFFh

SA9

64/32

30000h–3FFFFh

18000h–1FFFFh

SA8

64/32

20000h–2FFFFh

10000h–17FFFh

Bank 1

SA7

00111

16/8

1C000h–1FFFFh

0E000h–0FFFFh

SA6

32/16

14000h–1BFFFh

0A000h–0DFFFh

SA5

001001

8/4

12000h–13FFFh

09000h–09FFFh

SA4

001000

8/4

10000h–11FFFh

08000h–08FFFh

SA3

000111

8/4

0E000h–0FFFFh

07000h–07FFFh

SA2

000110

8/4

0C000h–0DFFFh

06000h–06FFFh

SA1

32/16

04000h–0BFFFh

02000h–05FFFh

SA0

00000

16/8

00000h–03FFFh

00000h–01FFFh

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