MBM29PL12LM Fujitsu Media Devices, MBM29PL12LM Datasheet - Page 25

• Manufacturer Part Number: MBM29PL12LM
• Description: FLASH MEMORY 128 M (16M x 8/8M x 16) BIT
• Manufacturer: Fujitsu Media Devices

■ FUNCTIONAL DESCRIPTION
Standby Mode
Automatic Sleep Mode
Autoselect
Read 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
this condition the current consumed is less than 5 µA Max. During Embedded Algorithm operation, V
current (I
of these standby modes.
When using the RESET pin only, CMOS standby mode is achieved with RESET input held at V
“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
During standby mode, the output is in the high impedance state, regardless of OE input.
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 µA (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.
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
then be sequenced from the devices outputs by toggling A
A
User Bus Operations (Byte Mode : BYTE = V
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
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.
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
access time (t
enable access time (t
addresses have been stable for at least t
power-up, to input hardware reset or to change CE pin from “H” or “L”.
3
,A
2
,A
1
and A
CC2
) is required even when CE = "H”. The device can be read with standard access time (t
CE
0
. See “MBM29PL12LM User Bus Operations (Word Mode : BYTE = V
) is the delay from stable addresses and stable CE to valid data at the output pins. The output
RH
OE
as a wake-up time for output to be valid for read access.
) is the delay from the falling edge of OE to valid data at the output pins. (Assuming the
ACC
) is equal to the delay from stable addresses to valid output data. The chip enable
ACC
-t
OE
IL
time.) When reading out a data without changing addresses after
)” in ■DEVICE BUS OPERATION.
0
. All addresses can be either High or Low except A
ID
on address pin A
MBM29PL12LM
9
pin. The command sequence is
9
. Three identifier bytes may
IH
)” and “MBM29PL12LM
CC
SS
±0.3 V. Under
CE
±0.3 V (CE =
) from either
CC
active
10
6
,
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