SST36VF1601G Просмотр технического описания (PDF) - Silicon Storage Technology
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SST36VF1601G Datasheet PDF : 36 Pages
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16 Mbit Concurrent SuperFlash
SST36VF1601G / SST36VF1602G
Data Protection
The SST36VF160xG provide both hardware and software
features to protect nonvolatile data from inadvertent writes.
Hardware Data Protection
Noise/Glitch Protection: A WE# or CE# pulse of less than 5
ns will not initiate a Write cycle.
VDD Power Up/Down Detection: The Write operation is
inhibited when VDD is less than 1.5V.
Write Inhibit Mode: Forcing OE# low, CE# high, or WE#
high will inhibit the Write operation. This prevents inadvert-
ent writes during power-up or power-down.
Hardware Block Protection
The SST36VF1601G and SST36VF1602G provide hard-
ware block protection which protects the outermost 8
KWord in the smaller bank. The block is protected when
WP# is held low. See Figures 2, 3, 4, and 5 for Block-Pro-
tection location.
Block protection is disabled by driving WP# high. This
allows data to be erased or programmed into the protected
sectors. WP# must be held high prior to issuing the Write
command and remain stable until after the entire Write
operation has completed. If WP# is left floating, it is inter-
nally held high via a pull-up resistor, and the Boot Block is
unprotected, enabling Program and Erase operations on
that block.
Hardware Reset (RST#)
The RST# pin provides a hardware method of resetting the
devices to read array data. When the RST# pin is held low
for at least TRP, any in-progress operation will terminate and
return to Read mode (see). When no internal Program/
Erase operation is in progress, a minimum period of TRHR
is required after RST# is driven high before a valid Read
can take place. See Figures 22 and 21 for more informa-
tion.
The interrupted Erase or Program operation must be re-ini-
tiated after the device resumes normal operation mode to
ensure data integrity.
Software Data Protection (SDP)
The SST36VF160xG devices implement the JEDEC
approved Software Data Protection (SDP) scheme for all
data alteration operations, such as Program and Erase.
These devices are shipped with the Software Data Protec-
tion permanently enabled. See Table 6 for the specific soft-
ware command codes.
Data Sheet
All Program operations require 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. SDP for Erase opera-
tions is similar to Program, but a six-byte load sequence is
required for Erase operations.
During SDP command sequence, invalid commands will
abort the device to read mode within TRC. The contents of
DQ15-DQ8 can be VIL or VIH, but no other value, during any
SDP command sequence.
Common Flash Memory Interface (CFI)
These devices contain Common Flash Memory Interface
(CFI) information that describes the characteristics of the
device. In order to enter the CFI Query mode, the system
must write a three-byte sequence, using the CFI Query
command, to address BKx555H in the last byte sequence.
The system can also use the one-byte sequence with
address BKx55H and Data Bus 98H to enter this mode.
See Figure 18 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 SST36VF160xG offer a 136-word Security ID space.
The Secure ID space is divided into two segments — one
128-bit, factory-programmed, segment and one 256-Byte,
user programmed segment. The first segment is pro-
grammed and locked at SST and contains a 128 bit Unique
ID which uniquely identifies the device. The user segment is
left un-programmed for the customer to program as desired.
The user segment of the Security ID can be programmed
using the Security ID Program command. End-of-Write sta-
tus is checked by reading the toggle bits. Data# Polling is
not used for Security ID End-of-Write detection.
Once the programming is complete, lock the Sec ID by
issuing the User Sec ID Program Lock-Out command.
Locking the Sec ID disables any corruption of this space.
Note that regardless of whether or not the Sec ID is locked,
the Sec ID segments can not 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. See Fig-
ure 20 for timing diagram. To exit this mode, the Exit Sec ID
command should be executed. Refer to Table 6 for more
details.
©2006 Silicon Storage Technology, Inc.
5
S71342-00-000
12/06
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