M29F002 データシートの表示（PDF） - Advanced Micro Devices

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M29F002

2 Megabit (256 K x 8-Bit) CMOS 5.0 Volt-only Boot Sector Flash Memory

Advanced Micro Devices 

PRELIMINARY

Table 5. Am29F002/Am29F002N Command Definitions

Command

Sequence

(Note 1)

Read (Note 5)

Reset (Note 6)

Manufacturer ID

Auto-

select

(Note 7)

Device ID,

Top Boot Block

Device ID,

Bottom Boot Block

Sector Protect Verify

(Note 8)

Program

Chip Erase

Sector Erase

Erase Suspend (Note 9)

Erase Resume (Note 10)

First

Second

Addr Data Addr Data

1 RA RD

1 XXX F0

4 555 AA 2AA 55

4 555 AA 2AA 55

Bus Cycles (Notes 2–4)

Third

Fourth

Addr Data Addr Data

Fifth

Addr Data

Sixth

Addr Data

555

90 X00 01

555

90 X01 B0

4 555 AA 2AA 55

555

90 X01 34

4 555 AA 2AA 55

555

90

(SA)

X02

00

01

4 555 AA 2AA 55

555

A0 PA PD

6 555 AA 2AA 55

555

80 555 AA 2AA 55 555 10

6 555 AA 2AA 55

555

80 555 AA 2AA 55 SA 30

1 XXX B0

1 XXX 30

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 A17–A13 uniquely select any sector.

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. Address bits A17–A12 are don’t cares for unlock and

command cycles, except when PA or SA is required.

5. No unlock or command cycles required when reading array

data.

6. 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).

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

read cycle.

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

protected sector. See “Autoselect Command Sequence” for

more information.

9. 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.

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

Suspend mode.

Am29F002/Am29F002N

15

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