EN29LV160AT-70BI View Datasheet(PDF) - Eon Silicon Solution Inc.

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EN29LV160AT-70BI

16 Megabit (2048K x 8-bit / 1024K x 16-bit) Flash Memory Boot Sector Flash Memory, CMOS 3.0 Volt-only

Eon Silicon Solution Inc. 

EN29LV160A

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.

There are two methods to enabling this hardware protection circuitry. The first one requires only

that the RESET# pin be at VID and then standard microprocessor timings can be used to enable or

disable this feature. See Flowchart 7a and 7b for the algorithm and Figure 12 for the timings.

When doing Sector Unprotect, all the other sectors should be protected first.

The second method is meant for programming equipment. This method requires VID be applied to

both OE# and A9 pin and non-standard microprocessor timings are used. This method is described

in a separate document called EN29LV160A Supplement, which can be obtained by contacting a

representative of Eon Silicon Solution, 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 sectors can be programmed

or erased by simply selecting the sector addresses. Once is

removed from the RESET# pin, all the previously protected sectors

are protected again. See accompanying figure and timing

diagrams for more details.

Notes:

1. All protected sectors unprotected.

2. Previously protected sectors protected

again.

Start

Reset#=VID (note 1)

Perform Erase or Program

Operations

Reset#=VIH

Temporary Sector

Unprotect Completed (note 2)

This Data Sheet may be revised by subsequent versions

9

or modifications due to changes in technical specifications.

©2004 Eon Silicon Solution, Inc., www.essi.com.tw

Rev. C, Issue Date: 2005/01/07

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