MBM29PL64LM90PCN datasheet(21/69 Pages) SPANSION

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MBM29PL64LM90/10

s 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 VCC

±0.3 V. Under

this condition the current consumed is less than 5 µA Max. During Embedded Algorithm operation, VCC active

current (ICC2) is required even when CE = "H”. The device can be read with standard access time (tCE) from either

of these standby modes.

When using the RESET pin only, CMOS standby mode is achieved with RESET input held at VSS

±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 tRH 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

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.

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 VID on address pin A9. Two identifier bytes may

then be sequenced from the devices outputs by toggling A0. All addresses can be either High or Low except A6,

A3,A2,A1 and A0. See “MBM29PL64LM User Bus Operations (Word Mode : BYTE = VIH)” and “MBM29PL64LM

User Bus Operations (Byte Mode : BYTE = VIL)” in sDEVICE 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 A9 pin. The command sequence is

illustrated in “MBM29PL64LM Standard Command Definitions” in sDEVICE 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 sDEVICE 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 (tACC) is equal to the delay from stable addresses to valid output data. The chip enable

access time (tCE) is the delay from stable addresses and stable CE to valid data at the output pins. The output

enable access time 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 tACC-tOE time.) When reading out a data without changing addresses after

power-up, input hardware reset or to change CE pin from “H” or “L”.

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