AM29BL802CB datasheet(22/46 Pages) AMD

22 / 46 page

Am29BL802C

22371C7 November 3, 2006

D A TA

SH EET

Command Definitions

Table 4.

Am29BL802C 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.

Notes:

1. See Table 1 for description of bus operations.

2. All values are in hexadecimal.

3. Except for the read cycle and the fourth cycle of the

autoselect command sequence, all bus cycles are write

cycles.

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 SA or PA required.

6. No unlock or command cycles required when reading array

data.

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

data when device is in the autoselect mode, or if DQ5 goes

high (while the device is providing status data).

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

read cycle.

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

protected sector. See “Autoselect Command Sequence” for

more information.

10. The data is 00h if the device is in asynchronous mode and

01h if in synchronous (burst) mode.

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

Bypass Program command.

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

reading array data when the device is in the unlock bypass

mode.

13. 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.

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

Suspend mode.

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

555

2AA

555

X00

Device ID, Bottom Boot Block

555

2AA

555

X01

2281

Sector Protect Verify (Note 9)

555

2AA

555

(SA)

X02

0000

0001

Burst Mode Status (Note 10)

555

2AA

555

X03

0000

0001

Program

555

2AA

555

Unlock Bypass

555

2AA

555

Unlock Bypass Program (Note 11)

XXX

Unlock Bypass Reset (Note 12)

XXX

Chip Erase

555

2AA

555

2AA

555

Sector Erase

555

2AA

555

2AA

Erase Suspend (Note 13)

XXX

Erase Resume (Note 14)

XXX

Burst Mode

Burst Mode Enable

555

2AA

555

XXX

Burst Mode Disable

555

2AA

555

XXX

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