Automatic Algorithm Initiation Method Of Flash Memory - Fujitsu F2MC-16LX Hardware Manual

25.4

Automatic Algorithm Initiation Method of Flash Memory

There are four types of commands to start the automatic algorithm of flash memory:
read/reset, write, sector erase, and chip erase. The control of the suspend and the
restart is enabled for the sector erase.
Command Sequence Table
Table 25.4-1 lists the commands used for flash memory write/erase. All data written on the command
register is in the units of byte, but be sure that the data can be written in word access. In this case, high-
order byte data is ignored.
Table 25.4-1 Command Sequence Table
Bus Programming
Command
Programming
Sequence
Cycle
Address
Read/
1 FxXXXX
*
Reset
Read/
4 FxAAAA
*
Reset
Programming
4 FxAAAA
Program
Chip Erasing 6 FxAAAA
Sector
6 FxAAAA
Erasing
Sector Erasing being Suspended
Sector Erasing being restarted
Auto-Select 3 FxAAAA XXAA
RA: Read address
PA: Program address. Only even addresses can be specified.
SA: See sector addresses (see "25.2 Sector Configuration of 3M-bit Flash Memory").
RD: Read data
PD: Program data. Only word data can be specified.
*:Two kinds of read/reset commands can reset flash memory to the read mode.
•
Note : The address Fx in the table means FF, FE, FD, FB, FA, and F9. In each operation, specify this as the value of the bank to be accessed.
•
Addresses in the table are the values in the CPU memory map. All addresses and data are expressed as hexadecimals. However, "X" is any value.
The Auto-Select in Table 25.4-1 is a command that is used to recognize the state of the sector protection.
Actually, an address is needed to be set along with the above command as follows:
Table 25.4-2 Address Setting at Auto-Select
AQ13 to AQ17
Sector protection Sector address
*: "01 " for the output in protected sector addresses, "00
H
the 1th bus the 2th bus
Programming
Cycle Cycle
Data Address Data
XXF0 - -
XXAA Fx5554 XX55
XXAA Fx5554 XX55
XXAA Fx5554 XX55
XXAA Fx5554 XX55
Entry of Address "FxXXXX" Data(xxB0
Entry of Address "FxXXXX" Data(xx30
Fx5554 XX55
AQ7
L
CHAPTER 25 3M-BIT FLASH MEMORY
the 3th bus the 4th bus
Programming Programming
Cycle Cycle
Address Data Address Data
-
FxAAAA XXF0 RA
PA
FxAAAA XXA0
(even) (word)
FxAAAA XX80 FxAAAA XXAA
FxAAAA XX80 FxAAAA XXAA
) temporally suspends erasing a sector in the middle of erasing the sector.
H
) restarts erasing after the temporal suspension of erasing of the sector.
H
FxAAAA XX90 -
AQ2 AQ1
H L
" for the output in non-protected sector addresses.
H
the 5th bus the 6th bus
Programming Programming
Cycle
Address Data Address
- - - -
RD - - -
PD
- - -
Fx5554 XX55 FxAAAA
SA
Fx5554 XX55
(even)
- - - -
AQ0 DQ7 to DQ0
L *
CODE
Cycle
Data
-
-
-
XX10
XX30
-
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