This Data Sheet may be revised by subsequent versions

©2003 Eon Silicon Solution, Inc., www.essi.com.tw

or modifications due to changes in technical specifications.

6

EN29LV512

Rev. B, Issue Date: 2004/01/05

USER MODE DEFINITIONS

Standby Mode

The EN29LV512 has a CMOS-compatible standby mode, which reduces the current to

< 1µA

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

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

Output Disable Mode

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.

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

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#,