AM29F400AT-90EC データシートの表示（PDF） - Advanced Micro Devices

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AM29F400AT-90EC

4 Megabit (512 K x 8-Bit/256 K x 16-Bit) CMOS 5.0 Volt-only Boot Sector Flash Memory

Advanced Micro Devices 

EMBEDDED ALGORITHMS

PRELIMINARY

Start

Write Erase Command Sequence

(see below)

Data Polling or Toggle Bit

Successfully Completed

Erasure Completed

Chip Erase Command Sequence

(Address/Command):

5555H/AAH

Individual Sector/Multiple Sector

Erase Command Sequence

(Address/Command):

5555H/AAH

2AAAH/55H

2AAAH/55H

5555H/80H

5555H/80H

5555H/AAH

5555H/AAH

2AAAH/55H

5555H/10H

2AAAH/55H

Sector Address/30H

Sector Address/30H

Sector Address/30H

Additional sector

erase commands

are optional

20380B-9

Note:

To insure the command has been accepted, the system software should check the status of DQ3 prior to and following each sub-

sequent sector erase command. If DQ3 were high on the second status check, the command may not have been accepted.

Figure 2. Embedded Erase Algorithm

18

Am29F400AT/Am29F400AB

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