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Document Number: 002-00856 Rev. *E
Page 11 of 59
S29JL064J
8.5
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, independent of the OE# input.
The device enters the CMOS standby mode when the CE# and RESET# pins are both held at V
CC
± 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 V
CC
± 0.3V, the device will be in the standby
mode, but the standby current will be greater. The device requires standard access time (t
CE
) for read access when the device is in
either of these standby modes, before it is ready to read data.
If the device is deselected during erasure or programming, the device draws active current until the operation is completed.
I
CC3
represents the standby current specification.
8.6
Automatic Sleep Mode
The automatic sleep mode minimizes Flash device energy consumption. The device automatically enables this mode when
addresses remain stable for t
ACC
+ 30 ns. The automatic sleep mode is independent 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. I
CC5
in
represents the automatic sleep mode current specification.
8.7
RESET#: Hardware Reset Pin
The RESET# pin provides a hardware method of resetting the device to reading array data. When the RESET# pin is driven low for
at least a period of t
RP
, 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 V
SS
±0.3V, the device draws CMOS standby
current (I
CC4
). If RESET# is held at V
IL
but not within V
SS
±0.3V, the standby current will be greater.
The RESET# pin may be tied to the system reset circuitry. A system reset would thus also reset the Flash memory, enabling the
system to read the boot-up firmware from the Flash memory.
If RESET# is asserted during a program or erase operation, the RY/BY# pin remains a “0” (busy) until the internal reset operation is
complete, which requires a time of t
READY
(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 t
READY
(not during Embedded Algorithms). The system can read data t
RH
after
the RESET# pin returns to V
IH
.
Refer to