ISSUE 4.3 : November 1998
PUMA 68F16006/A-80/90/12/15
SECTOR UNPROTECT ALGORITHM
START
Protect All Sectors
PLSCNT = 1
Set
A0=A9=Vil
A5=Vih
(setup for sector
unprotection)
PLSCNT=PLSCNT+1
Set
/OE=Vid orVsp
Time Out 10ms
/WE=Vsp
Remove
Vid or Vsp on A9
Write "Reset"
command
Activate
first /CE pulse
/OE=/WE=Vih
A9=Vid or Vsp
Write
Electric Signature
Command
Time Out 100us
/CE=Vih
Set up
Sector Address "SA0"
A0=Vil, A1=A6=Vih
Activate
second /CE pulse
Read
Data from Device
NO
NO
Increment
Sector Address
Data = 00H?
YES
PLSCNT=1000?
YES
Remove
Vid or Vsp on A9
Write "Reset"
command
NO
Sector
Address = SA7?
YES
Remove
Vid or Vsp on A9
Write "Reset"
command
Device Failed
END
NOTES:
SA0 = The First Sector Address
SA7 = The Last Sector Address
(Sector Address is indicated
using A16 to A18)
14
MOSAIC [ MOSAIC ]
