參數(shù)資料
型號(hào)： MBM29PL12LM10PBT
廠商： Fujitsu Limited
英文描述： FLASH MEMORY 128 M (16M ?8/8M ?16) BIT
中文描述： 快閃記憶體128米（1,600？8/8M？16）位
文件頁(yè)數(shù)： 25/72頁(yè)
文件大?。?/td> 1036K
代理商： MBM29PL12LM10PBT
MBM29PL12LM
10
25
■
FUNCTIONAL DESCRIPTION
Standby Mode
There are two ways to implement the standby mode on the device, one using both the CE and RESET pins, and
the other via the RESET pin only.
When using both pins, CMOS standby mode is achieved with CE and RESET input held at V
CC
±
0.3 V. Under
this condition the current consumed is less than 5 μA Max. During Embedded Algorithm operation, V
CC
active
current (I
CC2
) is required even when CE = "H”. The device can be read with standard access time (t
CE
) from either
of these standby modes.
When using the RESET pin only, CMOS standby mode is achieved with RESET input held at V
SS
±
0.3 V (CE =
“H” or “L”) . Under this condition the current consumed is less than 5 μA Max. Once the RESET pin is set high,
the device requires t
RH
as a wake-up time for output to be valid for read access.
During standby mode, the output is in the high impedance state, regardless of OE input.
Automatic Sleep Mode
Automatic sleep mode works to restrain power consumption during read-out of device data. It can be useful in
applications such as handy terminal, which requires low power consumption.
To activate this mode, the device automatically switch themselves to low power mode when the device addresses
remain stable after 30 ns from data valid. It is not necessary to control CE, WE, and OE in this mode. The current
consumed is typically 1
μ
A (CMOS Level).
Since the data are latched during this mode, the data are continuously read out. When the addresses are
changed, the mode is automatically canceled and the device read-out the data for changed addresses.
Autoselect
The Autoselect mode allows reading out of a binary code and identifies its manufacturer and type.It is intended
for use by programming equipment for the purpose of automatically matching the device to be programmed with
its corresponding programming algorithm.
To activate this mode, the programming equipment must force V
ID
on address pin A
9
. Three identifier bytes may
then be sequenced from the devices outputs by toggling A
0
. All addresses can be either High or Low except A
6
,
A
3
,A
2
,A
1
and A
0
. See “MBM29PL12LM User Bus Operations (Word Mode : BYTE = V
IH
)” and “MBM29PL12LM
User Bus Operations (Byte Mode : BYTE = V
IL
)” in
■
DEVICE BUS OPERATION.
The manufacturer and device codes may also be read via the command register, for instances when the device
is erased or programmed in a system without access to high voltage on the A
9
pin. The command sequence is
illustrated in “MBM29PL12LM Standard Command Definitions” in
■
DEVICE BUS OPERATION. Refer to Au-
toselect Command section.
In Word mode, a read cycle from address 00h returns the manufacturer’s code (Fujitsu = 04h) . A read cycle at
address 01h outputs device code. When 227Eh is output, it indicates that two additional codes, called Extended
Device Codes will be required. Therefore the system may continue reading out these Extended Device Codes
at addresses of 0Eh and 0Fh. Notice that the above applies to Word mode. The addresses and codes differ from
those of Byte mode. Refer to “Sector Group Protection Verify Autoselect Codes” in
■
DEVICE BUS OPERATION.
Read Mode
The device has two control functions required to obtain data at the outputs. CE is the power control and used
for a device selection. OE is the output control and used to gate data to the output pins.
Address access time (t
ACC
) is equal to the delay from stable addresses to valid output data. The chip enable
access time (t
CE
) is the delay from stable addresses and stable CE to valid data at the output pins. The output
enable access time (t
OE
) is the delay from the falling edge of OE to valid data at the output pins. (Assuming the
addresses have been stable for at least t
ACC
-t
OE
time.) When reading out a data without changing addresses after
power-up, to input hardware reset or to change CE pin from “H” or “L”.
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