參數(shù)資料
型號(hào)： ACT-F512K32N-090P3T
廠商： Aeroflex Inc.
英文描述： 3-line to 8-line decoder / demultiplexer 16-SOIC 0 to 70
中文描述： 行為F512K32高速16兆位閃存多芯片模塊
文件頁(yè)數(shù)： 8/20頁(yè)
文件大?。?/td> 238K
代理商： ACT-F512K32N-090P3T
A
Aeroflex Circuit Technology
SCD1665 REV B 6/29/01 Plainview NY (516) 694-6700
8
sequence. For Sector erase, the Toggle Bit is valid after
the last rising edge of the sector erase
WE
pulse. The
Toggle Bit is active during the sector time out.
See Figure 1 and 5.
D
5
EXCEEDED TIMING LIMITS
D
5
will indicate if the program or erase time has
exceeded the specified limits. Under these conditions
D
5
will produce a "1". The Program or erase cycle was
not successfully completed. Data Polling is the only
operation function of the device under this condition.
The CE circuit will partially power down the device under
these conditions by approximately 8 mA per chip. The
OE and WE pins will control the output disable functions
as shown in Table 1. To reset the device, write the reset
command sequence to the device. This allows the
system to continue to use the other active sectors in the
device.
D
3
SECTOR ERASE TIMER
After the completion of the initial sector erase command
sequence the sector erase time-out will begin. D
3
will
remain low until the time-out is complete. Data Polling
and Toggle Bit are valid after the initial sector erase
command sequence.
If Data Polling or the Toggle Bit indicates the device has
been written with a valid erase command, D
3
may be
used to determine if the sector erase timer window is still
open. If D
3
is high ("1") the internally controlled erase
cycle has begun; attempts to write subsequent
commands to the device will be ignored until the erase
operation is completed as indicated by Data Polling or
Toggle Bit. If D
3
is low ("0"), the device will accept
additional sector erase commands. To ensure the
command has been accepted, the software should
check the status of D
3
prior to and following each
subsequent sector erase command. If D
3
were high on
the second status check, the command may not have
been accepted. See Table 4
Sector Protection
Algorithims
SECTOR PROTECTION
The ACT-F512K32 features hardware sector protection
which will disable both program and erase operations to
an individual sector or any group of sectors. To activate
this mode, the programming equipment must force V
ID
on control pin OE and address pin A
9
. The sector
addresses should be set using higher address lines A
18
,
A
17
, and A
16
. The protection mechanism begins on the
falling edge of the WE pulse and is terminated with the
rising edge of the same.
To verify programming of the protection circuitry, the
programming equipment must force V
ID
on address pin
A9 with CE and OE at V
IL
and WE at V
IH
. Scanning the
sector addresses (A
16
, A
17
, and A
18
) while (A
6
, A
1
, A
0
)
= (0, 1, 0,) will produce a logical "1" code at device
output D
0
for a protected sector. Otherwise the device
will read 00H for unprotected sector. In this mode, the
lower order addresses, except for 0, A1, and A6 are don't
care.
It is also possible to verify if a sector is protected during
the sector protection operation. This is done by setting
A6 = CE = OE = V
IL
and WE = V
IH
(A
9
remains high at
V
ID
). Reading the device at address location XXX2H,
where the higher order addresses (A
L
8
, A
17
, and A
16
)
define a particular sector, will produce 01H at data
outputs (D0 - D7) for a protected sector.
SECTOR UNPROTECT
The ACT-F512K32 also features a sector unprotect
mode, so that a protected sector may be unprotected to
incorporate any changes in the code. All sectors should
be protected prior to unprotecting any sector.
To activate this mode, the programming equipment must
force Vid on control pins OE, CE, and address pin A9.
The address pins A
6
, A
16
, and A
12
should be set to V
IH
.
The unprotection mechanism begins on the falling edge
of the WE pulse and is terminated with the rising edge of
the same.
It is also possible to determine if a sector is unprotected
in the system by writing the autoselect command and A6
is set at V
IH
. Performing a read operation at address
location XXX2H, where the higher order addresses (A
18
,
A
17
, and A
16
) define a particular sector address, will
produce 00H at data outputs (D
0
-D
7
) for an unprotected
sector.
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