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AM29SL800DB-100WAI Scheda tecnica(PDF) 11 Page - Advanced Micro Devices

Il numero della parte AM29SL800DB-100WAI
Spiegazioni elettronici  8 Megabit (1 M x 8-Bit/512 K x 16-Bit) CMOS 1.8 Volt-only Super Low Voltage Flash Memory
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Produttore elettronici  AMD [Advanced Micro Devices]
Homepage  http://www.amd.com
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ADV ANCE
I N FO RMAT I O N
10
Am29SL800D
March 17, 2003
For program operations, the BYTE# pin determines
whether the device accepts program data in bytes or
words. Refer to “Word/Byte Configuration” for more
information.
The device features an Unlock Bypass mode to facil-
itate faster programming. Once the device enters the
Unlock Bypass mode, only two write cycles are
required to program a word or byte, instead of four. The
“Word/Byte Program Command Sequence” section
has details on programming data to the device using
b o th sta n d a rd a n d Un lo ck Byp a ss co mma n d
sequences.
An erase operation can erase one sector, multiple sec-
tors, or the entire device. Tables 2 and 3 indicate the
address space that each sector occupies. A “sector
address” consists of the address bits required to
uniquely select a sector. The “Command Definitions”
section has details on erasing a sector or the entire
chip, or suspending/resuming the erase operation.
After the system writes the autoselect command
sequence, the device enters the autoselect mode. The
system can then read autoselect codes from the
internal register (which is separate from the memory
array) on DQ7–DQ0. Standard read cycle timings
apply in this mode. Refer to the Autoselect Mode and
Autoselect Command Sequence sections for more
information.
ICC2 in the DC Characteristics table represents the
active current specification for the write mode. The “AC
Characteristics” section contains timing specification
tables and timing diagrams for write operations.
Program and Erase Operation Status
During an erase or program operation, the system may
check the status of the operation by reading the status
bits on DQ7–DQ0. Standard read cycle timings and ICC
read specifications apply. Refer to “Write Operation
Status” for more information, and to “AC Characteris-
tics” for timing diagrams.
Standby Mode
When the system is not reading or writing to the device,
it can place the device in the standby mode. In this
mode, current consumption is greatly reduced, and the
outputs are placed in the high impedance state, inde-
pendent of the OE# input.
The device enters the CMOS standby mode when the
CE# and RESET# pins are both held at VCC ± 0.2 V.
(Note that this is a more restricted voltage range than
VIH.) If CE# and RESET# are held at VIH, but not within
VCC ± 0.2 V, the device will be in the standby mode, but
the standby current will be greater. The device requires
standard access time (tCE) for read access when the
device is in either of these standby modes, before it is
ready to read data.
The device also enters the standby mode when the
RESET# pin is driven low. Refer to the next section,
RESET#: Hardware Reset Pin.
If the device is deselected during erasure or program-
ming, the device draws active current until the
operation is completed.
ICC3 in the DC Characteristics table represents the
standby current specification.
Automatic Sleep Mode
The automatic sleep mode minimizes Flash device
energy consumption. The device automatically
enables this mode when addresses remain stable for
tACC + 50 ns. The automatic sleep mode is indepen-
dent of the CE#, WE#, and OE# control signals.
Standard address access timings provide new data
when addresses are changed. While in sleep mode,
output data is latched and always available to the
system. ICC4 in the DC Characteristics table represents
the automatic sleep mode current specification.
RESET#: Hardware Reset Pin
The RESET# pin provides a hardware method of reset-
ting the device to reading array data. When the
RESET# pin is driven low for at least a period of tRP, the
device immediately terminates any operation in
progress, tristates all output pins, and ignores all
read/write commands for the duration of the RESET#
pulse. The device also resets the internal state
machine to reading array data. The operation that was
interrupted should be reinitiated once the device is
ready to accept another command sequence, to
ensure data integrity.
Current is reduced for the duration of the RESET#
pulse. When RESET# is held at VSS±0.2 V, the device
draws CMOS standby current (ICC4). If RESET# is held
at VIL but not within VSS±0.2 V, the standby current will
be greater.
The RESET# pin may be tied to the system reset cir-
cuitry. A system reset would thus also reset the Flash
memory, enabling the system to read the boot-up firm-
ware from the Flash memory.
If RESET# is asserted during a program or erase oper-
ation, the RY/BY# pin remains a “0” (busy) until the
internal reset operation is complete, which requires a
time of tREADY (during Embedded Algorithms). The
system can thus monitor RY/BY# to determine whether
the reset operation is complete. If RESET# is asserted
when a program or erase operation is not executing
(RY/BY# pin is “1”), the reset operation is completed
within a time of tREADY (not during Embedded Algo-
rithms). The system can read data tRH after the
RESET# pin returns to VIH.
Refer to the AC Characteristics tables for RESET#
parameters and to Figure 14 for the timing diagram.


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