ESMT
F49L320UA/F49L320BA
Operation Temperature Condition -40°C~85°C
Figure 16 shows the algorithms and Figure 15 shows the
timing diagram. This method uses standard microprocessor
bus cycle timing. For sector unprotect, all unprotected
sectors must first be protected prior to the first sector
unprotect write cycle.
Output Disable Mode
With the
is at a logic high level (V ), outputs from the
IH
OE
devices are disabled. This will cause the output pins in a high
impedance state
The alternate method intended only for programming
equipment requires V
on address pin A9,
, and
OE
ID
Standby Mode
.
RESET
When
and
are both held at V
RESET
± 0.3V, the
CE
device enter CMOS Standby mode. If
CC
and
are
CE
RESET
Auto-select Mode
held at V , but not within the range of V
device will still be in the standby mode, but the standby
current will be larger.
± 03V, t he
The auto-select mode provides manufacturer and device
identification and sector protection verification, through
outputs on DQ7–DQ0. This mode is primarily intended for
programming equipment to automatically match a device to
be programmed with its corresponding programming
algorithm. However, the auto-select codes can also be
accessed in-system through the command register.
IH
CC
If the device is deselected during auto algorithm of erasure or
programming, the device draws active current I
until the
CC2
operation is completed. I
in the DC Characteristics table
CC3
represents the standby current specification.
When using programming equipment, this mode requires
V
(10 V to 10.5 V) on address pin A9. While address pins
ID
The device requires standard access time (t ) for read
CE
access from either of these standby modes, before it is ready
to read data.
A3, A2, A1, and A0 must be as shown in Table 4.
To verify sector protection, all necessary pins have to be set
as required in Table 4, the programming equipment may
then read the corresponding identifier code on DQ7-DQ0.
Sector Protect / Un-protect Mode
To access the auto-select codes in-system, the host system
can issue the auto-select command via the command
register, as shown in Table 5. This method does not require
The hardware sector protect feature disables both program
and erase operations in any sector. The hardware sector
unprotect feature re-enables both the program and erase
operations in previously protected sectors. Sector
protect/unprotect can be implemented via two methods.
V . See “Software Command Definitions” for details on
ID
using the auto-select mode.
The primary method requires V on the
pin only,
RESET
ID
and can be implemented either in-system or via
programming equipment.
7.2 Software Command Definitions
Writing specific address and data commands or
sequences into the command register initiates the
device operations. Table 5 defines the valid register
command sequences. Writing incorrect address and
data values or writing them in the improper sequence
resets the device to reading array data.
All addresses are latched on the falling edge of
or
WE
, whichever happens later. All data is latched on the
CE
rising edge of
or
, whichever happens first.
WE
CE
Refer to the corresponding timing diagrams in the AC
Characteristics section.
Elite Semiconductor Memory Technology Inc.
Publication Date : Sep. 2008
Revision: 1.1
12/55
ESMT [ ELITE SEMICONDUCTOR MEMORY TECHNOLOGY INC. ]
