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DS42587 데이터시트(PDF) 13 Page - Advanced Micro Devices

부품명 DS42587
상세설명  Stacked Multi-Chip Package (MCP) Flash Memory and SRAM
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제조업체  AMD [Advanced Micro Devices]
홈페이지  http://www.amd.com
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DS42587
13
Standby Mode
When the system is not reading or writing to the de-
vice, 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#f and RESET# pins are both held at V
CC ± 0.3 V.
(Note that this is a more restricted voltage range than
V
IH.) If CE#f and RESET# are held at VIH, but not
within V
CC ± 0.3 V, the device will be in the standby
mode, but the standby current will be greater. The de-
vice 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 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 en-
ergy 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#f, WE#, and OE# control signals. Standard ad-
dr es s a c ce ss ti mi ngs pr ov i de ne w dat a whe n
addresses are changed. While in sleep mode, output
data is latched and always available to the system.
I
CC4 in the DC Characteristics table represents the
automatic sleep mode current specification.
RESET#: Hardware Reset Pin
The RESET# pin provides a hardware method of re-
setting 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 ma-
chine to reading array data. The operation that was
interrupted should be reinitiated once the device is
ready to accept another command sequence, to en-
sure data integrity.
Current is reduced for the duration of the RESET#
pulse. When RESET# is held at V
SS ± 0.3 V, the de-
vice draws CMOS standby current (I
CC4). If RESET# is
held at V
IL but not within VSS ± 0.3 V, the standby cur-
rent 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 op-
eration, 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 ex-
ecuting (RY/BY# pin is “1”), the reset operation is
completed within a time of tREADY (not during Embed-
ded Algorithms). The system can read data tRH after
the RESET# pin returns to VIH.
Refer to the AC Characteristics tables for RESET# pa-
rameters and to Figure 15 for the timing diagram.
Output Disable Mode
When the OE# input is at V
IH, output from the device is
disabled. The output pins are placed in the high
impedance state.
Table 4.
Device Bank Division
Device
Part Number
Bank 1
Bank 2
Megabits
Sector Sizes
Megabits
Sector Sizes
Am29DL323D
8 Mbit
Eight 8 Kbyte/4 Kword,
fifteen 64 Kbyte/32 Kword
24 Mbit
Forty-eight
64 Kbyte/32 Kword


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