CHAPTER 17 FLASH MEMORY

17.3Starting the Flash Memory Automatic Algorithm

Four types of commands are available for starting the flash memory automatic algorithm: Read/Reset, Write, and Chip Erase.

Command Sequence Table

Table 17.3-1lists the commands used for flash memory write/erase.

Table 17.3-1 Command Sequence Table

Command

Bus

1st bus write

2nd bus write

3rd bus write

4th bus read/

5th bus write

6th bus write

sequence

write

cycle

 

cycle

 

cycle

 

write cycle

cycle

 

cycle

 

 

access

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Address

 

Data

Address

 

Data

Address

 

Data

Address

Data

Address

 

Data

Address

 

Data

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Read/Reset

1

XXXX

 

F0

-

 

-

-

 

-

-

-

-

 

-

-

 

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(*)

4

FAAA

 

AA

F554

 

55

FAAA

 

F0

RA

RD

-

 

-

-

 

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Write

4

FAAA

 

AA

F554

 

55

FAAA

 

A0

PA

PD

-

 

-

-

 

-

program

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Chip Erase

6

FAAA

 

AA

F554

 

55

FAAA

 

80

FAAA

AA

F554

 

55

FAAA

 

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*: Both of the two types of Read/Reset commands can reset the flash memory to read mode.

Notes:

The addresses shown in the table are those on the CPU memory map. All addresses and data are represented in hexadecimal notation. The letter X indicates an appropriate value.

RA: Read address

PA: Write address.

RD: Read data

PD: Write data.

The flash memory can only accept the command sequences mentioned on the above table (Read/Reset, Write program, Chip Erase), other command sequences are strictly prohibited to be sent to the flash memory or else the flash memory may become malfunction.

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Fujitsu F202RA, MB89202 manual Starting the Flash Memory Automatic Algorithm, Command Sequence Table

F202RA, MB89202 specifications

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