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AM41DL3208G 데이터시트(PDF) 30 Page - Advanced Micro Devices

부품명 AM41DL3208G
상세설명  32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory and 8 Mbit (1 M x 8-Bit/512 K x 16-Bit) Static RAM
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제조업체  AMD [Advanced Micro Devices]
홈페이지  http://www.amd.com
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February 13, 2002
Am41DL3208G
29
P R E L IMINARY
Enter SecSi Sector/Exit SecSi Sector
Command Sequence
The system can access the SecSi Sector region by is-
suing the three-cycle Enter SecSi Sector command
sequence. The device continues to access the SecSi
Sector region until the system issues the four-cycle
Exit SecSi Sector command sequence. The Exit SecSi
Sector command sequence returns the device to nor-
mal operation. Tables 15 and 16 show the address
and data requirements for both command sequences.
See also “SecSi (Secured Silicon) Sector Flash Mem-
ory Region” for fur ther information. Note that a
hardware reset (RESET#=V
IL) will reset the device to
reading array data.
Byte/Word Program Command Sequence
The system may program the device by word or byte,
depending on the state of the CIOf pin. Programming
is a four-bus-cycle operation. The program command
sequence is initiated by writing two unlock write cy-
cles, followed by the program set-up command. The
program address and data are written next, which in
turn initiate the Embedded Program algorithm. The
system is not required to provide further controls or
timings. The device automatically provides internally
generated progr am pulses and verifies the pro-
grammed cell margin. Tables 15 and 16 show the
address and data requirements for the byte program
command sequence.
When the Embedded Program algorithm is complete,
that bank then returns to reading array data and ad-
dresses are no longer latched. The system can
determine the status of the program operation by
using DQ7, DQ6, or RY/BY#. Refer to the Write Oper-
ation Status section for information on these status
bits.
Any commands written to the device during the Em-
bedded Program Algorithm are ignored. Note that a
hardware reset immediately terminates the program
operation. The program command sequence should
be reinitiated once that bank has returned to reading
array data, to ensure data integrity.
Programming is allowed in any sequence and across
sector boundaries. A bit cannot be programmed
from “0” back to a “1.” Attempting to do so may
cause that bank to set DQ5 = 1, or cause the DQ7 and
DQ6 status bits to indicate the operation was success-
ful. However, a succeeding read will show that the
data is still “0.” Only erase operations can convert a
“0” to a “1.”
Unlock Bypass Command Sequence
The unlock bypass feature allows the system to pro-
gram bytes or words to a bank faster than using the
standard program command sequence. The unlock
bypass command sequence is initiated by first writing
two unlock cycles. This is followed by a third write
cycle containing the unlock bypass command, 20h.
That bank then enters the unlock bypass mode. A
two-cycle unlock bypass program command sequence
is all that is required to program in this mode. The first
cycle in this sequence contains the unlock bypass pro-
gram command, A0h; the second cycle contains the
program address and data. Additional data is pro-
grammed in the same manner. This mode dispenses
with the initial two unlock cycles required in the stan-
dard program command sequence, resulting in faster
total programming time. Tables 15 and 16 show the re-
quirements for the command sequence.
During the unlock bypass mode, only the Unlock By-
pass Program and Unlock Bypass Reset commands
are valid. To exit the unlock bypass mode, the system
must issue the two-cycle unlock bypass reset com-
mand sequence. The first cycle must contain the bank
address and the data 90h. The second cycle need
only contain the data 00h. The bank then returns to
the reading array data.
The device offers accelerated program operations
through the WP#/ACC pin. When the system asserts
V
HH on the WP#/ACC pin, the device automatically en-
ters the Unlock Bypass mode. The system may then
write the two-cycle Unlock Bypass program command
sequence. The device uses the higher voltage on the
WP#/ACC pin to accelerate the operation. Note that
the WP#/ACC pin must not be at V
HH any operation
other than accelerated programming, or device dam-
age may result. In addition, the WP#/ACC pin must not
be left floating or unconnected; inconsistent behavior
of the device may result.
Figure 3 illustrates the algorithm for the program oper-
ati on. Refer to the Fl as h Er as e and Pr ogr am
Operations table in the AC Characteristics section for
parameters, and Figure 18 for timing diagrams.


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