EN29F800 datasheet(8/38 Pages) ETC

8 / 38 page

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EN29F800

Rev. E, Issue Date: 2001/07/05

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

Programming is a four-bus-cycle operation. The program command sequence is initiated by writing two

unlock write cycles, followed by the program set-up command. The program address and data are written

next, which in turn initiate the Embedded Program algorithm. The system is

not required to provide further

controls or timings. The device automatically provides internally generated program pulses and verifies

the programmed cell margin. The Command Definitions in Table 5 show the address and data

requirements for the byte program command sequence.

When the Embedded Program algorithm is complete, the device then returns to reading array data and

addresses are no longer latched. The system can determine the status of the program operation by using

DQ7 or DQ6. See “Write Operation Status” for information on these status bits.

Any commands written to the device during the Embedded Program Algorithm are ignored.

Programming is allowed in any sequence and across sector boundaries. A bit cannot be programmed

from a “0” back to a “1”. Attempting to do so may halt the operation and set DQ5 to “1”, or cause the

Data# Polling algorithm to indicate the operation was successful. However, a succeeding read will show

that the data is still “0”. Only erase operations can convert a “0” to a “1”.

Sector Protection/Unprotection

The hardware sector protection feature disables both program and erase operations in any sector. The

hardware sector unprotection feature re-enables both program and erase operations in previously

protected sectors.

Sector protection/unprotection must be implemented using programming equipment. The procedure re-

quires a high voltage (VID) on address pin A9 and the control pins. Details on this method are provided in

a supplement, which can be obtained by contacting a representative of Eon Silicon Devices, Inc.

Temporary Sector Unprotect

This feature allows temporary unprotection of previously protected

sector groups to change data while in-system. The Sector Unprotect

mode is activated by setting the RESET# pin to VID. During this mode,

formerly protected sector groups can be programmed or erased by

simply selecting the sectgor addresses. Once is removed from the

RESET# pin, all the previously protected sector are protected again.

See accompanying figure and timing diagrams for more details.

Start

Reset#=VID (note 1)

Perform Erase or Program

Operations

Reset#=VIH

Temporary Sector

Unprotect Completed (note 2)

Notes:

1. All protected sectors unprotected.

2. Previously protected sectors protected

again.

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