ES29LV320D Datasheet, PDF (7/59 Pages) Excel Semiconductor Inc. – 32Mbit(4M x 8/2M x 16) CMOS 3.0 Volt-only, Boot Sector Flash Memory

EE SS II
Excel Semiconductor inc.
The device enters the CMOS standby mode when
CE# and RESET# pins are both held at Vcc+0.3V.
(Note that this is a more restricted voltage range
than V_IH.) If CE# and RESET# are held at V_IH, but
not within Vcc+0.3V, the device will be still in the
standby mode, but the standby current will be
greater than the CMOS standby current (0.2uA typi-
cally). When the device is in the standby mode, only
standard access time (t_CE) is required for read
access, before it is ready for read data. And even if
the device is deselected by CE# pin during erase or
programming operation, the device draws active cur-
rent until the operation is completely done. While the
device stays in the standby mode, the output is
placed in the high impedance state, independent of
the OE# input.
The device can enter the deep power-down mode
where current consumption is greatly reduced down
to less than 0.2uA typically by the following three
ways:
- CMOS standby ( CE#, RESET# = Vcc + 0.3V )
- During the device reset ( RESET# = Vss + 0.3V )
- In Autosleep Mode ( after t_ACC + 30ns )
Refer to the CMOS DC characteristics Table11 for
further current specification.
Autosleep Mode
The device automatically enters a deep power-down
mode called the autosleep mode when addresses
remain stable for t_ACC+30ns. In this mode, current
consumption is greatly reduced ( less than 0.2uA
typical ), regardless of CE#, WE# and OE# control
signals.
set-up cycle and the last cycle with the program
data and addresses. In this mode, two unlock
cycles are saved ( or bypassed ).
Sector Addresses
The entire memory space of cell array is divided
into a many of small sectors: 8kbytes x 8 boot sec-
tors and 64Kbytes x 63 main sectors. In erase
operation, a single sector, multiple sectors, or the
entire device (chip erase) can be selected for
erase. The address space that each sector occu-
pies is shown in detail in the Table 3-4.
Accelerated Program Mode
The device offers accelerated program operations
through the ACC function. This is one of two func-
tions provided by the WP#/ACC pin. This function
is primarily intended to allow faster manufacturing
throughput at the factory. If the system asserts V_HH
(11.5~12.5V) on this pin, the device automatically
enters the previously mentioned Unlock Bypass
mode, temporarily unprotects any protected sec-
tors, and uses the higher voltage on the pin to
reduce the time required for program operations.
Only two-cycle program command sequences are
required because the unlock bypass mode is auto-
matically activated in this acceleration mode. The
device returns to the normal operation when V_HH is
removed from the WP#/ACC pin. It should be
noted that the WP#/ACC pin must not be at V_HH for
operations other than accelerated programming, or
device damage may result. In addition, the WP#/
ACC pin must not be left floating or unconnected;
inconsistent or undesired behavior of the device
may result.
Writing Commands
Autoselect Mode
To write a command or command sequences to ini-
tiate some operations such as program or erase, the
system must drive WE# and CE# to V_IL, and OE# to
V_IH. For program operations, the BYTE# pin deter-
mines whether the device accepts program data in
bytes or words. Refer to “BYTE# timings for Write
Operations” in the Fig. 21 for more information.
Unlock Bypass Mode
To reduce more the programming time, an unlock-
bypass mode is provided. Once the device enters
this mode, only two write cycles are required to ini-
tiate the programming operation instead of four
cycles in the normal program command sequences
which are composed of two unlock cycles, program
Flash memories are intended for use in applica-
tions where the local CPU alters memory contents.
In such applications, manufacturer and device
identification (ID) codes must be accessible while
the device resides in the target system ( the so
called “in-system program”). On the other hand,
signature codes have been typically accessed by
raising A9 pin to a high voltage in PROM program-
mers. However, multiplexing high voltage onto
address lines is not the generally desired system
design practice. Therefore, in the ES29LV320
device an autoselect command is provided to
allow the system to access the signature codes
without any high voltage. The conventional A9
high-voltage method used in the PROM program-
ers for signature codes are still supported in this
device.
ES29LV320D
7
Rev. 2D Jan 5, 2006