A290021T-90 View Datasheet(PDF) - AMIC Technology

Part Name

Description

Manufacturer

A290021T-90

256K X 8 Bit CMOS 5.0 Volt-only, Boot Sector Flash Memory

AMIC Technology 

A29002/A290021 Series

Table 5. A29002/A290021 Command Definitions

Command

Sequence

(Note 1)

Read (Note 5)

First

Second

Addr Data Addr Data

1 RA RD

Reset (Note 6)

1 XXX F0

Manufacturer ID

Autoselect

4 555 AA 2AA 55

(Note 7) Device ID Top

4 555 AA 2AA 55

Bottom

Continuation ID

4 555 AA 2AA 55

Sector Protect Verify 4 555 AA 2AA 55

(Note 8)

Program

Chip Erase

4 555 AA

6 555 AA

2AA 55

2AA 55

Sector Erase

Erase Suspend (Note 9)

Erase Resume (Note 10)

6 555 AA

1 XXX B0

1 XXX 30

2AA 55

Bus Cycles (Notes 2 - 4)

Third

Fourth

Fifth

Sixth

Addr Data Addr Data Addr Data Addr Data

555 90 X00 37

555 90 X01 8C

0D

555 90 X03 7F

555 90 SA 00

X02 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 A17 - A13 select a unique sector.

Note:

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 operation.

4. Address bits A17 - A12 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 I/O5 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.

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

11. The time between each command cycle has to be less than 50µs.

(February, 2002, Version 1.0)

11

AMIC Technology, Inc.

Share Link: