SST39SF020-70-4I-U 데이터 시트보기 (PDF) - Silicon Storage Technology

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SST39SF020-70-4I-U

2 Megabit (256K x 8) Multi-Purpose Flash

Silicon Storage Technology 

2 Megabit Multi-Purpose Flash

SST39SF020

Preliminary Specifications

TABLE 4: SOFTWARE COMMAND SEQUENCE

Command

Sequence

Byte Program

Sector Erase

Chip Erase

Software ID Entry

Software ID Exit

Software ID Exit

1st Bus

Write Cycle

Addr(1) Data

5555H AAH

5555H AAH

5555H AAH

5555H AAH

XXH F0H

5555H AAH

2nd Bus

Write Cycle

Addr(1) Data

2AAAH 55H

2AAAH 55H

2AAAH 55H

2AAAH 55H

2AAAH 55H

3rd Bus

Write Cycle

Addr(1) Data

5555H A0H

5555H 80H

5555H 80H

5555H 90H

4th Bus

Write Cycle

Addr(1) Data

BA(3) Data

5555H AAH

5555H AAH

5555H F0H

Notes:

(1) Address format A14-A0 (Hex), Addresses A15, A16 and A17 are a “Don’t Care” for the

Command sequence.

(2) SAx for sector erase; uses A17-A12 address lines

(3) BA = Program Byte address

(4) Both Software ID Exit operations are equivalent

Notes for Software ID Entry Command Sequence

1. With A17 -A1 =0; SST Manufacturer Code = BFH, is read with A0 = 0,

SST39SF020 Device Code = B6H, is read with A0 = 1.

2. The device does not remain in Software Product ID Mode if powered down.

5th Bus

6th Bus

Write Cycle Write Cycle

Addr(1) Data Addr(1) Data

2AAAH 55H SAx(2) 30H

2AAAH 55H 5555H 10H

326 PGM T4.0

© 1998 Silicon Storage Technology, Inc.

6

326-10 12/98

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