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ES29DS160E-12RTG 数据表(PDF) 9 Page - Excel Semiconductor Inc.

部件名 ES29DS160E-12RTG
功能描述  32Mbit(4M x 8/2M x 16) CMOS 3.0 Volt-only, Boot Sector Flash Memory
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制造商  EXCELSEMI [Excel Semiconductor Inc.]
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标志 EXCELSEMI - Excel Semiconductor Inc.

ES29DS160E-12RTG 数据表(HTML) 9 Page - Excel Semiconductor Inc.

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ES I
ES I
9
Rev. 2D Jan 5, 2006
ES29LV320D
Excel Semiconductor inc.
be protected prior to the first sector unprotection
write cycle to avoid any over-erase due to the intrin-
sic erase characteristics of the protection cell. After
the unprotection operation, all previously protected
sectors will need to be individually re-protected.
Standard microprocessor bus cycle timings are used
in the unprotection and unprotect verification opera-
tions. Three unprotect methods are provided in the
ES29LV320 device. All unprotection and unprotect
verification cycles are summarized in detail at the
Table 1.
- In-system unprotection
- A9 High-voltage unprotection
- Temporary sector unprotection
In-System Unprotection
“In-system
unprotection”,
the
primary
method,
requires VID (11.5V~12.5V) on the RESET# with
A6=1, A1=1, and A0=0. This method can be imple-
mented either in-system or via programming equip-
ment. This method uses standard microprocessor
bus cycle timing. Refer to Fig. 29 for timing diagram
and Fig. 4 for the unprotection algorithm.
A9 High-Voltage Unprotection
“High-voltage unprotection”, the alternate method
intended only for programming equipment, must
force VID (11.5~12.5V) on address pin A9 and con-
trol pin OE# with A6=1, A1=1 and A0=0. Refer to
Fig. 32 for timing diagram and Fig. 6 for the unpro-
tection algorithm.
Temporary Sector Unprotect
This feature allows temporary unprotection of previ-
ously protected sectors to change data in-system.
The Sector Unprotect mode is activated by setting
the RESET# pin to VID (11.5V-12.5V). During this
mode, formerly protected sectors can be pro-
grammed
or
erased
by
selecting
the
sector
addresses. Once VID is removed from the RESET#
pin, all the previously protected sectors are pro-
tected again. Fig. 1 shows the algorithm, and Fig. 27
shows the timing diagrams for this feature.
WRITE PROTECT ( WP# )
The Write Protect function provides a hardware
method of protecting certain boot sectors without
using VID. This function is one of two provided by the
WP#/ACC pin.
If the system asserts VIL on the WP#/ACC pin, the
device disables program and erase functions in the
two “outermost” 8Kbytes boot sectors indepen-
dently of whether those sectors were protected or
unprotected using the method described in “Sector
Group Protection and Unprotection”. The two outer-
most of 8 Kbyte boot sectors are the two sectors
containing the lowest addresses in a bottom-boot-
configured device, or the two sectors containing the
highest addresses in a top-boot-configured device.
If the system asserts VIH on the WP#/ACC pin, the
device reverts to whether the two outermost 8
Kbyte boot sectors were last set to be protected or
unprotected. That is, sector protection or unprotec-
tion for these two sectors depends on whether they
were last protected or unprotected using the
method described in “Sector Group Protection and
Unprotection”.
Note that the WP#/ACC pin must not be left floating
or unconnected; inconsistent behavior of the device
may result.
Notes:
1. All protected sectors are unprotected (If WP#/ACC = VIL,
outermost boot sectors will remain protected).
2. All previously protected sectors are protected once again.
Figure 1. Temporary Sector Unprotect
Operation
START
RESET# = VID
(Note 1)
Perform Erase or
Program Operations
RESET# = VIH
Temporary Sector
Unprotect Completed
(Note 2)


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