SST34WA3283 Silicon Storage Technology, Inc., SST34WA3283 Datasheet - Page 12

• Manufacturer Part Number: SST34WA3283
• Description: 32 Mbit Burst Mode Concurrent Superflash Combomemory 32 Mbit Burst Mode Concurrent Superflash Combomemory
• Manufacturer: Silicon Storage Technology, Inc.

Advance Information
Hardware Reset (RST#)
The RST# pin provides a hardware method to reset the
flash memory of devices to read array data. When the
RST# pin is held low for at least T
operation will terminate and the flash memory will return to
Read Array mode. When no internal Program/Erase
operation is in progress, a minimum period of T
required after RST# is driven high before a valid Read can
take place.
The interrupted Erase operation must to be reinitiated after
the flash memory resumes normal operation mode to
ensure data integrity.
The RST# pin is an asynchronous input signal which
aborts an on-going Erase or Program operation and resets
the flash memory to Read Array mode within a time
T
Operation, the required time to reset the device is T
this point all outputs are tri-stated, and the device ignores
any Read/Write operations for the duration of the RST# low
pulse. The RST# reset operation will also reset the Flash
Burst Configuration register to Asynchronous Read Mode
and set the flash memory in Read Array mode.
Software Data Protection (SDP)
The
JEDEC approved Software Data Protection scheme for all
data alteration operations of the flash memory, such as
Program and Erase. Any single word Program operation
requires the inclusion of the three-word sequence. The
three-word load sequence is used to initiate the Program
operation, providing optimal protection from inadvertent
Write operations; for instance, during the system power-up
or power-down. Any Erase operation requires the inclusion
of six-word sequence. These devices are shipped with the
Software Data Protection permanently enabled. See Table
20 for the specific software command codes. During SDP
command sequence, invalid commands will abort the
device to read mode within T
DQ8 can be
command sequence.
Common Flash Memory Interface (CFI)
The SST34WA32A3/32A4/3283/3284 contains the CFI
information to describe the characteristics of the flash
memory. In order to enter the CFI Query mode, the system
must write a one word command or a three-word
sequence, with 98H— the CFI Query command—to
address 555H in the last word sequence. Once the device
enters the CFI Query mode, the system can read the CFI
data at the addresses given in Tables 23 through 27. The
System can write the CFI entry command when the device
is in Read Array mode and also when the device is in
Product Identification Mode. The system must write the CFI
©2007 Silicon Storage Technology, Inc.
Readyw
SST34WA32A3/32A4/3283/3284
. If RST# pin is asserted during a flash Read
V
IL
or
V
IH
, but no other value, during any SDP
SST34WA32A3 / SST34WA32A4 / SST34WA3283 / SST34WA3284
RC
. The contents of DQ15-
32 Mbit Burst Mode Concurrent SuperFlash ComboMemory
RP
, any in-progress
provides
Ready
RH
. At
the
is
12
Exit command to return to Read mode or Erase-Suspend
Read mode from the CFI Query mode.
Security ID
The SST34WA32A3/32A4/3283/3284 device offers a 136-
word Security ID space. The Secure ID space is divided
into
programmed
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
Security ID Word-Program command is required. Check
the end-of-write status of the Security ID by reading the
toggle bits. Do not use Data# Polling to detect the end-of-
write. Once the programming is complete, the Sec ID must
be locked using the User Sec ID Program Lock-Out, which
disables any future corruption of this space. Neither SEC
ID segment—user nor factory programmed—can be
erased, regardless of whether or not the Sec ID is locked.
The Secure ID space can be queried by executing a three-
word command sequence with Enter 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 8 for more details.
The Security ID space is located at addresses 000000H to
0000FFH. The Factory programmed segment is located at
addresses 000000H to 000007H. The User segment is
located at address 000080H to 0000FFH. The Security ID
Locked/Unlocked status can be read at Address
000007FH. See Table 20. If DQ
the Security ID is Unlocked. When DQ
Segment of the Security ID is Locked. Once the Query
Security ID Command is executed, the system can read
the Security ID space with normal Read cycles using the
valid address range 0000000H to 00000FFH. See Table 8
for more details.
.
TABLE 8: Security ID Valid Range
Security ID Segment
Factory Programmed
User Programmed
Sec ID Locked/
Unlocked Status
two
segments—one
segment
Start Address
and
000000H
000080H
00007FH
3
8-word,
= ‘1’ the User Segment of
one
S71358-01-000
3
128-word
128-bit
= ‘0’, the User
End Address
000007H
0000FFH
T8.0 1358
factory
user
11/07