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SSY39V800904IEK 데이터시트(PDF) 3 Page - Silicon Storage Technology, Inc

부품명 SSY39V800904IEK
상세설명  2 MBIT / 4 MBIT / 8 MBIT ( X 16 ) MULTI - PURPOSE FLASH
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제조업체  SST [Silicon Storage Technology, Inc]
홈페이지  http://www.sst.com/
Logo SST - Silicon Storage Technology, Inc

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Data Sheet
2 Mbit / 4 Mbit / 8 Mbit Multi-Purpose Flash
SST39LF200A / SST39LF400A / SST39LF800A
SST39VF200A / SST39VF400A / SST39VF800A
3
©2001 Silicon Storage Technology, Inc.
S71117-04-000
6/01
360
Data# Polling (DQ7)
When the SST39LF200A/400A/800A and SST39VF200A/
400A/800A are in the internal Program operation, any
attempt to read DQ7 will produce the complement of the
true data. Once the Program operation is completed, DQ7
will produce true data. The device is then ready for the next
operation. During internal Erase operation, any attempt to
read DQ7 will produce a ‘0’. Once the internal Erase opera-
tion is completed, DQ7 will produce a ‘1’. The Data# Polling
is valid after the rising edge of fourth WE# (or CE#) pulse
for Program operation. For Sector-, Block- or Chip-Erase,
the Data# Polling is valid after the rising edge of sixth WE#
(or CE#) pulse. See Figure 6 for Data# Polling timing dia-
gram and Figure 17 for a flowchart.
Toggle Bit (DQ6)
During the internal Program or Erase operation, any con-
secutive attempts to read DQ6 will produce alternating 1s
and 0s, i.e., toggling between 1 and 0. When the internal
Program or Erase operation is completed, the DQ6 bit will
stop toggling. The device is then ready for the next opera-
tion. The Toggle Bit is valid after the rising edge of fourth
WE# (or CE#) pulse for Program operation. For Sector-,
Block- or Chip-Erase, the Toggle Bit is valid after the rising
edge of sixth WE# (or CE#) pulse. See Figure 7 for Toggle
Bit timing diagram and Figure 17 for a flowchart.
Data Protection
The SST39LF200A/400A/800A and SST39VF200A/400A/
800A provide both hardware and software features to pro-
tect 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.
Software Data Protection (SDP)
The SST39LF200A/400A/800A and SST39VF200A/400A/
800A provide the JEDEC approved Software Data Protec-
tion scheme for all data alteration operations, 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. This group of
devices are shipped with the Software Data Protection per-
manently enabled. See Table 4 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 can be VIL or VIH, but no other
value, during any SDP command sequence.
Common Flash Memory Interface (CFI)
The SST39LF200A/400A/800A and SST39VF200A/400A/
800A also contain the CFI information to describe the char-
acteristics of the device. In order to enter the CFI Query
mode, the system must write three-byte sequence, same
as Software ID Entry command with 98H (CFI Query com-
mand) to address 5555H in the last byte sequence. Once
the device enters the CFI Query mode, the system can
read CFI data at the addresses given in Tables 5 through 9.
The system must write the CFI Exit command to return to
Read mode from the CFI Query mode.


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