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SST39VF6402B 데이터시트(PDF) 4 Page - Silicon Storage Technology, Inc

부품명 SST39VF6402B
상세설명  64 Mbit (x16) Multi-Purpose Flash Plus
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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
64 Mbit Multi-Purpose Flash Plus
SST39VF6401B / SST39VF6402B
©2006 Silicon Storage Technology, Inc.
S71288-02-000
7/06
Data Protection
The SST39VF640xB 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 SST39VF6402B support top hardware block protec-
tion, which protects the top 32 KWord block of the device.
The SST39VF6401B support bottom hardware block pro-
tection, which protects the bottom 32 KWord block of the
device. The Boot Block address ranges are described in
Table 2. Program and Erase operations are prevented on
the 32 KWord when WP# is low. If WP# is left floating, it is
internally held high via a pull-up resistor, and the Boot
Block is unprotected, enabling Program and Erase opera-
tions on that block.
Hardware Reset (RST#)
The RST# pin provides a hardware method of resetting the
device 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. 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 Figure 15).
The Erase or Program operation that has been interrupted
needs to be reinitiated after the device resumes normal
operation mode to ensure data integrity.
Software Data Protection (SDP)
The SST39VF640xB provide the JEDEC approved 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. These devices 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
can be VIL or VIH, but no other value, during any SDP com-
mand sequence.
Common Flash Memory Interface (CFI)
The SST39VF640xB also contain the CFI information to
describe the characteristics of the device. In order to enter
the CFI Query mode, the system must write three-byte
sequence, same as product ID entry command with 98H
(CFI Query command) to address 555H 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 7 through 9. The system must write the CFI Exit
command to return to Read mode from the CFI Query
mode.
TABLE
2: BOOT BLOCK ADDRESS RANGES
Product
Address Range
Bottom Boot Block
SST39VF6401B
000000H-007FFFH
Top Boot Block
SST39VF6402B
3F8000H-3FFFFFH
T2.0 1288


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