AM29F040B-120PF データシートの表示（PDF） - Advanced Micro Devices

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AM29F040B-120PF

4 Megabit (512 K x 8-Bit) CMOS 5.0 Volt-only, Uniform Sector Flash Memory

Advanced Micro Devices 

DATA SHEET

Command Definitions

Table 4. Am29F040B Command Definitions

Command

Sequence

(Note 1)

Read (Note 5)

Reset (Note 6)

Manufacturer ID

Autoselect

(Note 7)

Device ID

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

4 555 AA 2AA 55

4 555 AA 2AA 55

6 555 AA 2AA 55

6 555 AA 2AA 55

1 XXX B0

1 XXX 30

Bus Cycles (Notes 2–4)

Third

Fourth

Fifth

Sixth

Addr Data Addr Data Addr Data Addr Data

555

90 X00

01

555

90 X01

A4

555

90

SA

X02

00

01

555

A0 PA

PD

555

80 555

AA

2AA 55

555

10

555

80 555

AA 2AA 55

SA

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 A18–A16 select a unique 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 A18–A11 are don’t cares for unlock and

command cycles, unless SA or PA 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.

November 1, 2006 21445E5

Am29F040B

13

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