ES29LV800D datasheet(22/50 Pages) EXCELSEMI

Part #	ES29LV800D

Description	8Mbit(1M x 8/512K x 16) CMOS 3.0 Volt-only, Boot Sector Flash Memory

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Manufacturer	EXCELSEMI [Excel Semiconductor Inc.]

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ES I

22

Rev. 1D January 5, 2006

ES29LV800D

Excel Semiconductor inc.

In the ES29LV800 device, several bits are provided

to determine the status of a program or erase oper-

ation: DQ2, DQ3, DQ5, DQ6, DQ7 and RY/BY#.

Table 6 and the following subsections describe the

function of these bits. DQ7 and DQ6 each offer a

method for determining whether a program or erase

operation is complete or in progress. The device

also provides a hardware-based output signal, RY/

BY#, to determine whether an Embedded Program

or Erase operation is in progress or has been com-

pleted.

DQ7 (DATA# POLLING)

The Data# Polling bit, DQ7, indicates to the host

system whether an Embedded Program or Erase

algorithm is in progress or completed, or whether a

device is in Erase Suspend. Data# Polling is valid

after the rising edge of the final WE# pulse in the

command sequence.

During Programming

During the Embedded Program algorithm, the

device outputs on DQ7 the complement of the

datum programmed to DQ7. This DQ7 status also

applies to programming during Erase Suspend.

When the Embedded Program algorithm is com-

plete, the device outputs the datum programmed to

DQ7. The system must provide the program

address to read valid status information on DQ7. If

a program address falls within a protected sector,

Data# Polling on DQ7 is active for approximately

250ns, then the device returns to the read mode.

During Erase

During the Embedded Erase algorithm, Data# Poll-

ing produces a “0” on DQ7. When the Embedded

Erase algorithm is complete, or if the device enters

the Erase Suspend mode, Data# polling produces a

“1” on DQ7. The system must provide an address

within any of the sectors selected for erasure to read

valid status information on DQ7.

Erase on the Protected Sectors

After an erase command sequence is written, if all

sectors selected for erasing are protected, Data#

Polling on DQ7 is active for approximately 1.8us,

then the device returns to the read mode. If not all

selected sectors are protected, the Embedded Erase

algorithm erases the unprotected sectors, and

ignores the selected sectors that are protected. How-

ever, if the system reads DQ7 at an address within a

protected sector, the status may not be valid.

Data# Polling Algorithm

Just prior to the completion of an Embedded

Program or Ease operation, DQ7 may change

asynchronously

with

DQ0-DQ6

while

Output

Enable(OE#) is asserted low. That is, this device

may change from providing status information to

valid data on DQ7. Depending on when the system

samples the DQ7 output, it may read the status or

valid data. Even if the device has completed

the

program or erase operation and DQ7 has valid data,

the data outputs on DQ0-DQ7 will appear on

successive read cycles.

Table 6 shows the outputs for Data# Polling on DQ7.

Fig. 9 shows the Data# Polling algorithm. Fig. 22 in

the AC Characteristics section shows the Data#

Polling timing diagram.

WRITE OPERATION STATUS

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