16 Mbit Concurrent SuperFlash + 2 / 4 Mbit SRAM ComboMemory
SST34HF1621 / SST34HF1641
Data Sheet
TABLE 4: SOFTWARE COMMAND SEQUENCE
Command
Sequence
1st Bus
Write Cycle
2nd Bus
Write Cycle
3rd Bus
Write Cycle
4th Bus
Write Cycle
5th Bus
Write Cycle
6th Bus
Write Cycle
Addr1 Data2 Addr1 Data2 Addr1 Data2 Addr1 Data2 Addr1 Data2 Addr1 Data2
5555H AAH 2AAAH 55H 5555H A0H Data
WA3
Word-Program
Sector-Erase
4
5555H AAH 2AAAH 55H 5555H 80H 5555H AAH 2AAAH 55H
5555H AAH 2AAAH 55H 5555H 80H 5555H AAH 2AAAH 55H
SAX
BAX
30H
50H
4
Block-Erase
Chip-Erase
5555H AAH 2AAAH 55H 5555H 80H 5555H AAH 2AAAH 55H 5555H 10H
5555H AAH 2AAAH 55H 5555H 90H
Software ID Entry5
CFI Query Entry5
5555H AAH 2AAAH 55H 5555H 98H
Software ID Exit/
CFI Exit6
5555H AAH 2AAAH 55H 5555H F0H
T4.4 523
1. Address format A14-A0 (Hex),Address A15-A19 can be VIL or VIH, but no other value, for the Command sequence.
2. Data format DQ15-DQ8 can be VIL or VIH, but no other value, for Command sequence.
3. WA = Program Word address
4. SAX for Sector-Erase; uses A19-A11 address lines
BAX for Block-Erase; uses A19-A15 address lines
5. The device does not remain in Software Product Identification mode if powered down.
6. With A20-A1 = 0;
SST Manufacturer’s ID = 00BFH, is read with A0 = 0
SST34HF1621/1641 Device ID = 2761H, is read with A0 = 1.
1
TABLE 5: CFI QUERY IDENTIFICATION STRING
Address
10H
Data
Data
0051H
0052H
0059H
0001H
0007H
0000H
0000H
0000H
0000H
0000H
0000H
Query Unique ASCII string “QRY”
11H
12H
13H
Primary OEM command set
14H
15H
Address for Primary Extended Table
16H
17H
Alternate OEM command set (00H = none exists)
Address for Alternate OEM extended Table (00H = none exits)
18H
19H
1AH
T5.0 523
1. Refer to CFI publication 100 for more details.
©2001 Silicon Storage Technology, Inc.
S71172-05-000 10/01 523
9
SST [ SILICON STORAGE TECHNOLOGY, INC ]
