EN29F080(2000) 查看數據表（PDF） - Eon Silicon Solution Inc.

零件编号

产品描述 (功能)

生产厂家

EN29F080
(Rev.:2000)

8 Megabit (1024K x 8-bit) Flash Memory

Eon Silicon Solution Inc. 

EN29F080

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.

The Reset command must be issued to re-enable the device for reading array data if DQ5 goes high, or while

in the autoselect mode. See next section for details on Reset.

Reset Command

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 method which is intended for PROM programmers

and requires VID on address bit A9.

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

Autoselect mode is then entered and the system may read at any address 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.

Byte Programming Command

Programming the EN29F080 is performed on a byte-by-byte basis 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 W E , whichever is last; data is latched on the rising edge of CE or W E , whichever is first.

The program operation is completed when EN29F080 returns the equivalent data to the programmed

location.

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

bit). Changing data from 0 to 1 requires an erase operation. 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

4800 Great America Parkway, Suite 202

9

Santa Clara, CA 95054

Tel: 408-235-8680

Fax: 408-235-8685

Share Link: