AM29DL800B datasheet(19/43 Pages) AMD

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Am29DL800B

P R E L I M I NARY

Table 5.

Am29DL800B Command Definitions

Legend:

X = Don’t care

RA = Address of the memory location to be read.

RD = Data read from location RA during read operation.

PA = Address of the memory location to be programmed.

Addresses latch on the falling edge of the WE# or CE# pulse,

whichever happens later.

PD = Data to be programmed at location PA. Data latches on the

rising edge of WE# or CE# pulse, whichever happens first.

SA = Address of the sector to be verified (in autoselect mode) or

erased. Address bits A18–A12 uniquely select any sector.

BA = Address of the bank that is being switched to autoselect

mode, is in bypass mode, or is being erased. Address bits A18–

A16 select a bank.

Notes:

1. See Table 1 for description of bus operations.

2. All values are in hexadecimal.

3. Except when reading array or autoselect data, all bus cycles

are write operations.

4. Data bits DQ15–DQ8 are don’t cares for unlock and command

cycles.

5. Address bits A18–A11 are don’t cares for unlock and

command cycles, unless bank address (BA) is required.

6. No unlock or command cycles required when bank is in read

mode.

7. The Reset command is required to return to reading array

data (or to the erase-suspend-read mode if previously in

Erase Suspend) when a bank is in the autoselect mode, or if

DQ5 is goes high (while the bank is providing status

information).

8. The fourth cycle of the autoselect command sequence is a

read cycle. The system must provide the bank address to

obtain the manufacturer or device ID information.

9. The data is 00h for an unprotected sector and 01h for a

protected sector. See the Autoselect Command Sequence

section for more information.

10. The Unlock Bypass command is required prior to the Unlock

Bypass Program command.

11. The Unlock Bypass Reset command is required to return to

reading array data when the bank is in the unlock bypass

mode.

12. The system may read and program in non-erasing sectors, or

enter the autoselect mode, when in the Erase Suspend mode.

The Erase Suspend command is valid only during a sector

erase operation, and requires the bank address.

13. The Erase Resume command is valid only during the Erase

Suspend mode, and requires the bank address.

Command

Sequence

(Note 1)

Bus Cycles (Notes 2–5)

First

Second

Third

Fourth

Fifth

Sixth

Addr Data Addr

Data

Addr

Data

Addr

Data

Addr Data

Addr

Data

Read (Note 6)

Reset (Note 7)

XXX

Manufacturer ID

Word

555

2AA

(BA)555

(BA)X00

Byte

AAA

555

(BA)AAA

Device ID,

Top Boot Block

Word

555

2AA

(BA)555

(BA)X01

224A

Byte

AAA

555

(BA)AAA

(BA)X02

Device ID,

Bottom Boot Block

Word

555

2AA

(BA)555

(BA)X01

22CB

Byte

AAA

555

(BA)AAA

(BA)X02

Sector Protect

Verify (Note 9)

Word

555

2AA

(BA)555

(SA)

X02

XX00

XX01

Byte

AAA

555

(BA)AAA

(SA)

X04

Program

Word

555

2AA

555

Byte

AAA

555

AAA

Unlock Bypass

Word

555

2AA

555

Byte

AAA

555

AAA

Unlock Bypass Program (Note 10)

XXX

Unlock Bypass Reset (Note 11)

XXX

Chip Erase

Word

555

2AA

555

2AA

555

Byte

AAA

555

AAA

555

AAA

Sector Erase

Word

555

2AA

555

2AA

Byte

AAA

555

AAA

555

Erase Suspend (Note 12)

Erase Resume (Note 13)

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