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EN29LV320C Datasheet(HTML) 12 Page - Eon Silicon Solution Inc.

Part No. EN29LV320C
Description  32 Megabit (4096K x 8-bit / 2048K x 16-bit) Flash Memory Boot Sector Flash Memory, CMOS 3.0 Volt-only
Download  49 Pages
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Maker  EON [Eon Silicon Solution Inc.]
Homepage  http://www.essi.com.tw
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EN29LV320C Datasheet(HTML) 12 Page - Eon Silicon Solution Inc.

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This Data Sheet may be revised by subsequent versions
© 2004 Eon Silicon Solution, Inc.,
www.eonssi.com
or modifications due to changes in technical specifications.
12
EN29LV320C
Rev. B, Issue Date: 2011/05/13
When using programming equipment, the autoselect mode requires V
B
ID
B
(8.5 V to 9.5 V) on address pin
A9. Address pins A6, A1, and A0 must be as shown in Autoselect Codes table. In addition, when
verifying sector protection, the sector address must appear on the appropriate highest order address
bits. Refer to the corresponding Sector Address Tables. The “Command Definitions” table shows the
remaining address bits that are don’t-care. When all necessary bits have been set as required, the
programming equipment may then read the corresponding identifier code on DQ15–DQ0.
To access the autoselect codes in-system; the host system can issue the autoselect command via the
command register, as shown in the Command Definitions table. This method does not require V
B
ID
B
. See
“Command Definitions” for details on using the autoselect mode.
Writing Command Sequences
To write a command or command sequence to program data to the device or erase data, the system
has to drive WE# and CE# to V
B
IL, and OE# to V
B
IH
B
.
For program operations, the BYTE# pin determines whether the device accepts program data in bytes
or words. An erase operation can erase one sector or the whole chip.
The system can also read the autoselect codes by entering the autoselect mode, which need the
autoselect command sequence to be written. Please refer to the “Command Definitions” for all the
available commands.
RESET#: Hardware Reset
When RESET# is driven low for t
B
RP
B
, all output pins are tristates. All commands written in the internal
state machine are reset to reading array data.
Please refer to timing diagram for RESET# pin in “AC Characteristics”.
Sector Group Protection & Chip Unprotection
The hardware sector group protection feature disables both program and erase operations in any
sector. The hardware chip unprotection feature re-enables both program and erase operations in
previously protected sectors. A sector group implies three or four adjacent sectors that would be
protected at the same time. Please see the following tables 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 VID and then standard microprocessor timings can be used to enable or disable this
feature. See Flowchart 7a and 7b for the algorithm and Figure 12 for the timings.
When doing Chip 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 VID to be applied to both
OE# and A9 pins and non-standard microprocessor timings are used. This method is described in a
separate document named EN29LV320C Supplement, which can be obtained by contacting a
representative of Eon Silicon Solution, Inc.
U


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