A290021UL-150 datasheet(10/32 Pages) AMICC

Part #	A290021UL-150

Description	256K X 8 Bit CMOS 5.0 Volt-only, Boot Sector Flash Memory

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Manufacturer	AMICC [AMIC Technology]

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A29002/A290021 Series

(February, 2002, Version 1.0)

10

AMIC Technology, Inc.

START

Write Erase

Command

Sequence

Data Poll

from System

Data = FFh ?

Erasure Completed

Yes

Embedded

Erase

algorithm in

progress

Note :

1. See the appropriate Command Definitions table for erase

command sequences.

2. See "I/O3 : Sector Erase Timer" for more information.

No

Figure 3. Erase Operation

Figure 3 illustrates the algorithm for the erase operation.

Refer to the Erase/Program Operations tables in the "AC

Characteristics" section for parameters, and to the Sector

Erase Operations Timing diagram for timing waveforms.

Erase Suspend/Erase Resume Commands

The Erase Suspend command allows the system to interrupt

a sector erase operation and then read data from, or program

data to, any sector not selected for erasure. This command is

valid only during the sector erase operation, including the

50

µs time-out period during the sector erase command

sequence. The Erase Suspend command is ignored if written

during the chip erase operation or Embedded Program

algorithm. Writing the Erase Suspend command during the

Sector Erase time-out immediately terminates the time-out

period and suspends the erase operation. Addresses are

"don't cares" when writing the Erase Suspend command.

When the Erase Suspend command is written during a

sector erase operation, the device requires a maximum of

20

µs to suspend the erase operation. However, when the

Erase Suspend command is written during the sector erase

time-out, the device immediately terminates the time-out

period and suspends the erase operation.

After the erase operation has been suspended, the system

can read array data from or program data to any sector not

selected for erasure. (The device "erase suspends" all

sectors selected for erasure.) Normal read and write timings

and command definitions apply. Reading at any address

within erase-suspended sectors produces status data on I/O7

- I/O0. The system can use I/O7, or I/O6 and I/O2 together, to

determine if a sector is actively erasing or is erase-

suspended. See "Write Operation Status" for information on

these status bits.

After an erase-suspended program operation is complete,

the system can once again read array data within non-

suspended sectors. The system can determine the status of

the program operation using the I/O7 or I/O6 status bits, just

as in the standard program operation. See "Write Operation

Status" for more information.

The system may also write the autoselect command

sequence when the device is in the Erase Suspend mode.

The device allows reading autoselect codes even at

addresses within erasing sectors, since the codes are not

stored in the memory array. When the device exits the

autoselect mode, the device reverts to the Erase Suspend

mode, and is ready for another valid operation. See

"Autoselect Command Sequence" for more information.

The system must write the Erase Resume command

(address bits are "don't care") to exit the erase suspend

mode and continue the sector erase operation. Further writes

of the Resume command are ignored. Another Erase

Suspend command can be written after the device has

resumed erasing.

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