EN29LV040A datasheet(6/35 Pages) EON | 4 Megabit (512K x 8-bit ) Uniform Sector, CMOS 3.0 Volt-only Flash Memory

Part No.	EN29LV040A

Description	4 Megabit (512K x 8-bit ) Uniform Sector, CMOS 3.0 Volt-only Flash Memory

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Manufacturer	EON [Eon Silicon Solution Inc.]

Direct Link	http://www.essi.com.tw

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This Data Sheet may be revised by subsequent versions

or modifications due to changes in technical specifications.

6

EN29LV040A

Rev. A, Issue Date: 2005/08/16

USER MODE DEFINITIONS

Standby Mode

The EN29LV040A has a CMOS-compatible standby mode, which reduces the current to

< 1µA

(typical). It is placed in CMOS-compatible standby when the CE pin is at VCC ± 0.3. The device also

has a TTL-compatible standby mode, which reduces the maximum VCC current to < 1mA. It is

placed in TTL-compatible standby when the CE pin is at VIH. When in standby modes, the outputs

are in a high-impedance state independent of the OE input.

Read Mode

The device is automatically set to reading array data after device power-up. No commands are required to

retrieve data. The device is also ready to read array data after completing an Embedded Program or

Embedded Erase algorithm.

After the device accepts an Erase Suspend command, the device enters the Erase Suspend mode. The

system can read array data using the standard read timings, except that if it reads at an address within

erase-suspended sectors, the device outputs status data. After completing a programming operation in

the Erase Suspend mode, the system may once again read array data with the same exception. See

“Erase Suspend/Erase Resume Commands” for more additional information.

The system

must issue the reset command to re-enable the device for reading array data if DQ5 goes

high, or while in the autoselect mode. See the “Reset Command” additional details.

Output Disable Mode

When the CE or OE pin is at a logic high level (VIH), the output from the EN29LV040A is disabled.

The output pins are placed in a high impedance state.

Auto Select Identification Mode

The autoselect mode provides manufacturer and device identification, and sector protection

verification, through identifier codes output on DQ7–DQ0. This mode is primarily intended for

programming equipment to automatically match a device to be programmed with its corresponding

programming algorithm. However, the autoselect codes can also be accessed in-system through the

command register.

When using programming equipment, the autoselect mode requires VID (11 V) on address pin A9.

Address pins A8, A6, A1, and A0 must be as shown in Autoselect Codes table. In addition, when

verifying sector protection, the sector address must appear on the appropriate highest order address

bits. Refer to the corresponding Sector Address Tables. The Command Definitions table shows the

remaining address bits that are don’t-care. When all necessary bits have been set as required, the

programming equipment may then read the corresponding identifier code on DQ7–DQ0.

To access the autoselect codes in-system; the host system can issue the autoselect command via

the command register, as shown in the Command Definitions table. This method does not require

VID. See “Command Definitions” for details on using the autoselect mode.

Write Mode

Write operations, including programming data and erasing sectors of memory, require the host

system to write a command or command sequence to the device. Write cycles are initiated by

placing the byte or word address on the device’s address inputs while the data to be written is input

on DQ[7:0]. The host system must drive the CE# and WE# pins Low and the OE# pin High for a

valid write operation to take place. All addresses are latched on the falling edge of WE# and CE#,

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