參數(shù)資料
型號: AM49DL32XBG
英文描述: Am49DL32xBG - Stacked Multi-Chip Package (MCP) Flash Memory and SRAM
中文描述: Am49DL32xBG -堆疊式多芯片封裝(MCP)閃存和SRAM
文件頁數(shù): 14/62頁
文件大?。?/td> 933K
代理商: AM49DL32XBG
12
Am49DL3208G
September 19, 2003
A D V A N C E I N F O R M A T I O N
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-
dress access timings provide new data when ad-
dresses are changed. While in sleep mode, output
data is latched and always available to the system.
I
CC5
f in the 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 RE-
SET# 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 in-
terrupted should be reinitiated once the device is
sure data integrity.
Current is reduced for the duration of the RESET#
pulse. When RESET# is held at V
SS
±0.3 V, the device
draws CMOS standby current (I
CC4
f). If RESET# is
held at V
IL
but not within V
SS
±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 t
READY
(during Embedded Algorithms). The sys-
tem 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 Algo-
rithms). The system can read data t
RH
after the RE-
SET# pin returns to V
IH
.
Refer to the AC Characteristics tables for RESET# pa-
rameters and to
Figure 17
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 2.
Top Boot Sector Addresses
B
Sector
Sector Address
A20–A12
000000xxx
000001xxx
000010xxx
000011xxx
000100xxx
000101xxx
000110xxx
000111xxx
001000xxx
001001xxx
001010xxx
001011xxx
001100xxx
001101xxx
001110xxx
001111xxx
010000xxx
010001xxx
010010xxx
Sector Size
(Kwords)
32
32
32
32
32
32
32
32
32
32
32
32
32
32
32
32
32
32
32
(x16)
Address Range
000000h–07FFFh
008000h–0FFFFh
010000h–17FFFh
018000h–01FFFFh
020000h–027FFFh
028000h–02FFFFh
030000h–037FFFh
038000h–03FFFFh
040000h–047FFFh
048000h–04FFFFh
050000h–057FFFh
058000h–05FFFFh
060000h–067FFFh
068000h–06FFFFh
070000h–077FFFh
078000h–07FFFFh
080000h–087FFFh
088000h–08FFFFh
090000h–097FFFh
B
SA0
SA1
SA2
SA3
SA4
SA5
SA6
SA7
SA8
SA9
SA10
SA11
SA12
SA13
SA14
SA15
SA16
SA17
SA18
B
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