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EN29LV640 Datasheet

  • EN29LV640

  • Eon Silicon Solution Inc. [64 Megabit (4M x 16-bit ) CMOS 3...

  • 423.46KB

  • EON

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EN29LV640
鈥淐ommand Definitions鈥?for details on using the autoselect mode. Note that a
Reset command is
required to return to read mode
when the device is in the autoselect mode.
TABLE 4. Autoselect Codes (Using High Voltage, V
ID
)
B
B
Description
CE#
OE#
WE#
A21
to
A15
X
A14
to
A10
X
A9
2
P
P
A8
H
P
A7
A6
A5
to
A2
X
A1
A0
DQ15 to DQ0
XX1Ch
1
P
Manufacturer ID:
Eon
Autoselect
Device ID
Sector Protection
Verification
L
L
H
V
ID
B
B
X
L
L
L
L
XX7Fh
L
L
H
X
X
V
ID
B
B
X
X
L
X
L
H
227Eh
XX01h
L
L
H
SA
X
V
ID
B
B
X
X
L
X
H
L
(Protected)
XX00h
(Unprotected)
L=logic low= V
IL
, H=Logic High= V
IH
, V
ID
=11
卤
0.5V, X=Don鈥檛 Care (either L or H, but not floating!), SA=Sector
Addresses
B
B
B
B
B
B
Note:
1. A8=H is recommended for Manufacturing ID check. If a manufacturing ID is read with A8=L, the chip will output a
configuration code 7Fh.
2. A9 = V
ID
is for HV A9 Autoselect mode only. A9 must be
鈮?/div>
Vcc (CMOS logic level) for Command Autoselect
Mode.
B
B
RESET#: Hardware Reset
When RESET# is driven low for t
RP
, all output pins are tristates. All commands written in the internal
state machine are reset to reading array data.
B
B
Please refer to timing diagram for RESET# pin in 鈥淎C Characteristics鈥?
Sector Group Protection & Unprotection
The hardware sector group protection feature disables both program and erase operations in any sector
group. The hardware chip unprotection feature re-enables both program and erase operations in previously
protected sector group. A
sector group
consists of
four adjacent sectors
that would be protected at the
same time. Please see Table 2 which show the organization of sector groups.
There are two methods to enable this hardware protection circuitry. The first one requires only that the
RESET# pin be at V
ID
and then standard microprocessor timings can be used to enable or disable this
feature. See Flowchart 6a and 6b for the algorithm and Figure 11 for the timings.
When doing Sector Group Unprotect, all the unprotected sector groups must be protected prior to any
unprotect write cycle.
The second method is for programming equipment. This method requires V
ID
to be applied to both OE#
and A9 pins and non-standard microprocessor timings are used. This method is described in a
separate document, the Datasheet Supplement of EN29LV640H/L ; EN29LV640U, which can be
obtained by contacting a representative of Eon Silicon Solution, Inc.
This Data Sheet may be revised by subsequent versions
or modifications due to changes in technical specifications.
12
漏2005 Eon Silicon Solution, Inc., www.essi.com.tw
Rev. C, Issue Date: 2007/01/23

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