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SST34HF3244C Datenblatt(PDF) 6 Page - Silicon Storage Technology, Inc

Teilenummer SST34HF3244C
Bauteilbeschribung  32 Mbit Concurrent SuperFlash 4 Mbit SRAM ComboMemory
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Hersteller  SST [Silicon Storage Technology, Inc]
Direct Link  http://www.sst.com/
Logo SST - Silicon Storage Technology, Inc

SST34HF3244C Datenblatt(HTML) 6 Page - Silicon Storage Technology, Inc

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Data Sheet
32 Mbit Concurrent SuperFlash + 4 Mbit SRAM ComboMemory
SST34HF3244C
©2006 Silicon Storage Technology, Inc.
S71282-02-000
8/06
Software Data Protection (SDP)
The SST34HF3244C provide the JEDEC standard Soft-
ware Data Protection scheme for all data alteration opera-
tions, i.e., Program and Erase. Any Program operation
requires the inclusion of the three-byte sequence. The
three-byte load sequence is used to initiate the Program
operation, providing optimal protection from inadvertent
Write operations, e.g., during the system power-up or
power-down. Any Erase operation requires the inclusion of
six-byte sequence. The SST34HF3244C are shipped with
the Software Data Protection permanently enabled. See
Table 6 for the specific software command codes. During
SDP command sequence, invalid commands will abort the
device to Read mode within TRC. The contents of DQ15-
DQ8 are “Don’t Care” during any SDP command
sequence.
Common Flash Memory Interface (CFI)
These devices also contain the CFI information to
describe the characteristics of the devices. In order to
enter the CFI Query mode, the system must write the
three-byte sequence, same as the Software ID Entry com-
mand with 98H (CFI Query command) to address
BKX555H in the last byte sequence. In order to enter the
CFI Query mode, the system can also use the one-byte
sequence with BKX55H on Address and 98H on Data Bus.
See Figure 16 for CFI Entry and Read timing diagram.
Once the device enters the CFI Query mode, the system
can read CFI data at the addresses given in Tables 7
through 9. The system must write the CFI Exit command
to return to Read mode from the CFI Query mode.
Security ID
The SST34HF3244C devices offer a 136-word Security ID
space. The Secure ID space is divided into two seg-
ments—one 128-bit factory programmed segment and one
128-word (256-byte) user-programmed segment. The first
segment is programmed and locked at SST with a unique,
128-bit number. The user segment is left un-programmed
for the customer to program as desired.
To program the user segment of the Security ID, the user
must use the Security ID Program command. End-of-Write
status is checked by reading the toggle bits. Data# Polling
is not used for Security ID End-of-Write detection. Once
programming is complete, the Sec ID should be locked
using the User-Sec-ID-Program-Lock-Out. This disables
any future corruption of this space. Note that regardless of
whether or not the Sec ID is locked, neither Sec ID seg-
ment can be erased. The Secure ID space can be queried
by executing a three-byte command sequence with Query-
Sec-ID command (88H) at address 555H in the last byte
sequence. To exit this mode, the Exit-Sec-ID command
should be executed. Refer to Table 6 for more details.


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