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A29DL323
(Rev.:2002)

32M-Bit CMOS Low Voltage Dual Operation Flash Memory 4M-Byte by 8-Bit (Byte Mode) / 2M-Word by 16-Bit (Word Mode)

AMIC Technology 

I/O2: Toggle Bit II

Toggle bit II is a function that determines the status of

automatic erase (or erase suspend) is in progress for a

particular sector by using I/O2.

I/O2 is toggled when continuous read is performed from

addresses in a sector during automatic erase (or erase

suspend). Either OE or CE is used to control continuous

read.

When program to a sector that is not subject to erase

suspend is attempted during erase suspend, read from

sectors that are not subject to erase suspend cannot be

performed until program is completed. In this case, "1" will

be output to I/O2 if a continuous read is performed from an

address in a sector other than an erased sector.

In this way, it is possible to determine the status of

automatic erase (including erase suspend) is in progress for

sectors specified using I/O2, but whether the state is erase in

progress or erase suspend cannot be determined with I/O2.

To determine this, I/O6 (Toggle Bit) must be used. See

section “I/O6 (Toggle Bit)”.

For the timing waveform, refer to Timing Waveform for I/O2

vs. I/O6.

I/O5 : Exceeding Timing Limits

If the program / erase time exceeds the prescribed number

of pulses during automatic program / erase (exceeding

timing limit), "1" is output to I/O5 and automatic program /

erase failure is indicated.

Moreover, if overwriting "0" to "1" is attempted, the device

judges data overwrite to be impossible, and "1" is output to

I/O5 when the timing limit is exceeded.

When this happens, execute command reset.

I/O3 : Sector Erase Timer

A 50µs timeout period occurs following write with the sector

erase command sequence before automatic erase starts.

During this timeout period, "0" is output to I/O3. When

automatic erase starts upon completion of the timeout

period, "1" is output to I/O3.

If sector erase is performed, first confirm whether the device

has received a command by using I/O7 (Data Polling) or I/O6

(Toggle Bit). Then, using I/O3, check whether automatic

erase has started. If I/O3 is "0", the timeout period is not

over, and so it is possible to add sectors to erase. If I/O3 is

"1", automatic erase starts and other commands (except

erase suspend) are ignored until erase is completed.

If a sector to erase is added during the sector erase timeout

period, it is recommended to check I/O3 prior to and

following the addition. If I/O3 is "1" following the addition,

that addition may not be accepted.

A29L323 Series

RYBY : Read/Busy

The RY/ BY is a dedicated output pin used to check the

status of automatic program / erase is in progress.

During automatic program / erase, "0" is output to the RY

/BY . If "1" is output, this signifies that the device is either in

the read mode (including erase suspend) or standby mode.

Since the RY/ BY is an open-drain output pin, it is possible

to connect several RY/ BY in series by connecting a pull-up

resistor to VCC.

For the timing waveform, refer to Timing Waveform for

RY/BY (Ready / Busy ).

START

Read (I/O0 to I/O7)

An=Any Address in the Bank Being Executed

No

I/O7=Toggle?

Yes

I/O5=1?

Yes

No

Read (I/O0 to I/O7)

An=Any Address in the Bank Being Executed

No

I/O7=Toggle?

No

FAIL

PASS

Figure 7. Toggle Bit Flow Chart

PRELIMINARY (May, 2002, Version 0.0)

27

AMIC Technology, Inc.

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