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AM41DL6408G 데이터시트(PDF) 21 Page - SPANSION

부품명 AM41DL6408G
부품 상세설명  Stacked Multi-Chip Package (MCP) Flash Memory and SRAM
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Am41DL6408G
August 19, 2002
P R E L I M INARY
The alternate method intended only for programming
equipment requires V
ID on address pin A9 and OE#.
This method is compatible with programmer routines
written for earlier 3.0 volt-only AMD flash devices.
The device is shipped with all sectors unprotected.
AMD offers the option of programming and protecting
sectors at its factory prior to shipping the device
through AMD’s ExpressFlash™ Service. Contact an
AMD representative for details.
It is possible to determine whether a sector is pro-
tected or unprotected. See the Sector/Sector Block
Protection and Unprotection section for details.
Write Protect (WP#)
The Write Protect function provides a hardware
method of protecting without using V
ID. This function is
one of two provided by the WP#/ACC pin.
If the system asserts V
IL on the WP#/ACC pin, the de-
vice disables program and erase functions in sectors
0, 1, 140, and 141, independently of whether those
sectors were protected or unprotected using the
method described in “Sector/Sector Block Protection
and Unprotection”.
If the system asserts V
IH on the WP#/ACC pin, the de-
vice reverts to whether sectors 0, 1, 140, and 141
were last set to be protected or unprotected. That is,
sector protection or unprotection for these sectors de-
pends on whether they were last protected or unpro-
tected using the method described in “Sector/Sector
Block Protection and Unprotection”.
Note that the WP#/ACC pin must not be left floating or
unconnected; inconsistent behavior of the device may
result.
Table 9.
WP#/ACC Modes
Temporary Sector Unprotect
(Note: For the following discussion, the term “sector”
applies to both sectors and sector blocks. A sector
block consists of two or more adjacent sectors that are
protected or unprotected at the same time (see Table
8).
This feature allows temporary unprotection of previ-
ously protected sectors to change data in-system. The
Sector Unprotect mode is activated by setting the RE-
SET# pin to V
ID. During this mode, formerly protected
sectors can be programmed or erased by selecting the
sector addresses. Once V
ID is removed from the RE-
SET# pin, all the previously protected sectors are
protected again. Figure 1 shows the algorithm, and
Figure 25 shows the timing diagrams, for this feature.
If the WP#/ACC pin is at VIL, sectors 0, 1, 140, and
141 will remain protected during the Temporary sector
Unprotect mode.
Figure 1.
Temporary Sector Unprotect Operation
WP# Input
Voltage
Device
Mode
V
IL
Disables programming and erasing in
SA0, SA1, SA140, and SA141
V
IH
Enables programming and erasing in
SA0, SA1, SA140, and SA141
V
HH
Enables accelerated progamming (ACC).
See “Accelerated Program Operation” on
page 14.
START
Perform Erase or
Program Operations
RESET# = V
IH
Temporary Sector
Unprotect Completed
(Note 2)
RESET# = V
ID
(Note 1)
Notes:
1. All protected sectors unprotected (If WP#/ACC = V
IL,
sectors 0, 1, 140, and 141 will remain protected).
2. All previously protected sectors are protected once
again.


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