A29DL323UV-90(2002) Ver la hoja de datos (PDF) - AMIC Technology

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A29DL323UV-90
(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 

Sector Erase Suspend / Resume Commands

This command suspends automatic erase. During erase

suspend, sectors for which erase is not performed can be read

and programmed.

Sector erase (including the timeout period) and data program

operations can be both be suspended. Chip erase operations

cannot be suspended. Suspend can be performed for all

sectors for which erase is being performed.

Following command sequence write, 20µs are required until

automatic erase is suspended.

While automatic erase is suspended, any sector for which

erase is not being performed can be read and programmed.

Whether automatic erase is suspended can be determined

with the hardware sequence flags (I/O7, I/O6, I/O2 pins). See

sections “I/O7 (Data Polling)”, “I/O6 (Toggle Bit)”, and “I/O2

(Toggle Bit II)".

If resume automatic erase that has been suspended, write the

resume command (30H) while sector erase is suspended. At

this time, input a bank address of the sector for which erasure

is suspended.

Caution Sector Erase Suspend / Resume Commands

If automatic erase resume and suspend are repeated at

intervals of less than 100µs, the erasure operation may not be

correctly completed.

Unlock Bypass Command Sequence

This device provides an unlock bypass mode to shorten the

program time.

Normally, 4 write cycle included with 2 unlock cycles are

required during program. In contrast, with the unlock bypass

mode, it is possible to perform program without unlock cycles.

In the unlock bypass mode, all commands except unlock

bypass program and unlock bypass reset are ignored.

To end the unlock bypass mode, the unlock bypass reset

command must be written. Note, however, that the unlock

bypass reset command must be written to an address of the

bank that is not being read in dual operation. If the unlock

bypass reset command is written, the device returns to the

normal read mode.

In the unlock bypass mode, the operating current is necessary

even if CE = VIH.

For the flowchart, refer to Figure 5.

Unlock Bypass Set

This command sets the device to the unlock bypass mode.

Unlock Bypass Program

This command is used to perform program in the unlock

bypass mode.

Unlock Bypass Reset

This command is used to quit the unlock bypass mode.

When this command is executed, the device returns to the

read mode.

A29DL323 Series

START

Address=555H

Data=AAH

Address=2AAH

Data=55H

Address=555H

Data=20H

Unlock Bypass Set

Address=Don't Care

Data=A0H

Address=Program Address

Data=Program Data

Data Polling

Unlock Bypass Program

Next Address

No

Last Address ?

Yes

Programming Completed

Address=BA

Data=90H

Address=Don't Care

Data=00H

End

Unlock Bypass Reset

Note: This flow chart shows the WORD mode's case. In the BYTE

mode, address to be input is different from the WORD mode.

See Table 8. Command Sequence

Figure 5. Unlock Bypass Flow Chart (WORD Mode)

PRELIMINARY (May, 2002, Version 0.0)

23

AMIC Technology, Inc.

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