EN29LV800C Ver la hoja de datos (PDF) - Eon Silicon Solution Inc.

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EN29LV800C

8 Megabit (1024K x 8-bit / 512K x 16-bit) Flash Memory Boot Sector Flash Memory, CMOS 3.0 Volt-only

Eon Silicon Solution Inc. 

Reset Command

EN29LV800C

Writing the reset command to the device resets the device to reading array data. Address bits are don’t-

care for this command.

The reset command may be written between the sequence cycles in an erase command sequence

before erasing begins. This resets the device to reading array data. Once erasure begins, however, the

device ignores reset commands until the operation is complete. The reset command may be written

between the sequence cycles in a program command sequence before programming begins. This

resets the device to reading array data (also applies to programming in Erase Suspend mode). Once

programming begins, however, the device ignores reset commands until the operation is complete.

The reset command may be written between the sequence cycles in an autoselect command sequence.

Once in the autoselect mode, the reset command must be written to return to reading array data (also

applies to autoselect during Erase Suspend).

If DQ5 goes high during a program or erase operation, writing the reset command returns the device to

reading array data (also applies during Erase Suspend).

Autoselect Command Sequence

The autoselect command sequence allows the host system to access the manufacturer and devices codes, and

determine whether or not a sector is protected. The Command Definitions table shows the address and data

requirements. This is an alternative to the method that requires VID on address bit A9 and is intended for PROM

programmers.

Two unlock cycles followed by the autoselect command initiate the autoselect command sequence.

Autoselect mode is then entered and the system may read at addresses shown in Table 4 any number

of times, without needing another command sequence.

The system must write the reset command to exit the autoselect mode and return to reading array data.

Word / Byte Programming Command

The device may be programmed by byte or by word, depending on the state of the Byte# Pin.

Programming the EN29LV800C is performed by using a four bus-cycle operation (two unlock write

cycles followed by the Program Setup command and Program Data Write cycle). When the program

command is executed, no additional CPU controls or timings are necessary. An internal timer

terminates the program operation automatically. Address is latched on the falling edge of CE# or WE#,

whichever is last; data is latched on the rising edge of CE# or WE#, whichever is first.

Programming status may be checked by sampling data on DQ7 (DATA# polling) or on DQ6 (toggle bit).

When the program operation is successfully completed, the device returns to read mode and the user

can read the data programmed to the device at that address. Note that data can not be programmed

from a 0 to a 1. Only an erase operation can change a data from 0 to 1. When programming time limit is

exceeded, DQ5 will produce a logical “1” and a Reset command can return the device to Read mode.

Chip Erase Command

Chip erase is a six-bus-cycle operation. The chip erase command sequence is initiated by writing two

unlock cycles, followed by a set-up command. Two additional unlock write cycles are then followed by

the chip erase command, which in turn invokes the Embedded Erase algorithm. The device does not

require the system to preprogram prior to erase. The Embedded Erase algorithm automatically

preprograms and verifies the entire memory for an all zero data pattern prior to electrical erase. The

system is not required to provide any controls or timings during these operations. The Command

Definitions table shows the address and data requirements for the chip erase command sequence.

Any commands written to the chip during the Embedded Chip Erase algorithm are ignored.

This Data Sheet may be revised by subsequent versions

13

or modifications due to changes in technical specifications.

© 2004 Eon Silicon Solution, Inc.,

Rev. H, Issue Date: 2011/10/26

www.eonssi.com

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