4 Mbit SuperFlash EEPROM
SST28SF040A / SST28VF040A
Data Sheet
SST28SF/VF040A. Users may wish to use the software
operation to identify the device (i.e., using the device ID).
For details see Table 3 for the hardware operation and Fig-
ure 19 for the software operation. The manufacturer and
device IDs are the same for both operations.
Successive Reads
An Alternative means for determining an end of a write
operation is by reading the same address for two consecu-
tive data matches.
Product Identification
TABLE 1: PRODUCT IDENTIFICATION
The Product Identification mode identifies the device as
SST28SF/VF040A and the manufacturer as SST. This
mode may be accessed by hardware and software opera-
tions. The hardware operation is typically used by an exter-
nal programmer to identify the correct algorithm for the
Address
Data
Manufacturer’s ID
Device ID
0000H
BFH
SST28SF/VF040A
0001H
04H
T1.1 310
FUNCTIONAL BLOCK DIAGRAM
SuperFlash
Memory
X-Decoder
A
- A
0
18
Address Buffer & Latches
Control Logic
Y-Decoder
CE#
OE#
WE#
I/O Buffers and Data Latches
DQ - DQ
7
0
310 ILL B1.1
4
3
2
1
32 31 30
29
5
A7
A6
A14
A13
A8
6
28
27
26
25
24
23
22
21
7
A5
8
A4
A9
32-lead PLCC
Top View
9
A3
A11
OE#
A10
CE#
DQ7
10
11
12
13
A2
A1
A0
DQ0
14 15 16 17 18 19 20
310 ILL F02.3
FIGURE 1: PIN ASSIGNMENTS FOR 32-LEAD PLCC
©2001 Silicon Storage Technology, Inc.
S71077-04-000 6/01 310
4
SST [ SILICON STORAGE TECHNOLOGY, INC ]
