AM29PDL129H AMD [Advanced Micro Devices], AM29PDL129H Datasheet - Page 29

• Manufacturer Part Number: AM29PDL129H
• Description: 128 Megabit (8 M x 16-Bit) CMOS 3.0 Volt-only, Page Mode Simultaneous Read/Write Flash Memory with Enhanced VersatileIO
• Manufacturer: AMD [Advanced Micro Devices]

COMMAND DEFINITIONS
Enter /Exit Command Sequence
The region provides a secured data area containing a
random, eight word electronic serial number (ESN).
The system can access the region by issuing the
three-cycle Enter command sequence. The device
continues to access the region until the system issues
the four-cycle Exit command sequence. The Exit om-
mand sequence returns the device to normal opera-
tion. The SecSi Sector is not accessible when the
device is executing an Embedded Program or embed-
ded Erase algorithm. shows the address and data re-
quirements for both command sequences. See also
“SecSi Sector Flash Memory Region and Enter SecSi
Sector/Exit SecSi Sector Command Sequence” for fur-
ther information. Note that the ACC function and un-
lock bypass modes are not available when the SecSi
Sector is enabled.
If the Persistent Sector Protection Mode Locking Bit is
verified as programmed without margin, the Persistent
Sector Protection Mode Locking Bit Program Com-
mand should be reissued to improve program margin.
If the SecSi Sector Protection Bit is verified as pro-
grammed without margin, the SecSi Sector Protection
November 2, 2005
Figure 5.
Am29PDL129H
Bit Program Command should be reissued to improve
program margin.
ditional cycles are needed to determine whether the
PPB has been programmed with margin. If the PPB
has been programmed without margin, the program
command should be reissued to improve the program
margin. Also note that the total number of PPB pro-
gram/erase cycles is limited to 100 cycles. Cycling the
PPBs beyond 100 cycles is not guaranteed.
After erasing the PPBs, two additional cycles are
needed to determine whether the PPB has been
erased with margin. If the PPBs has been erased with-
out margin, the erase command should be reissued to
improve the program margin.
PPB Lock Bit Status
Sector Protection Status
either the PPB or DYB for a given sector or sector
group can be verified by writing a Sector Protection
Status command to the device.
Note that there is no single command to independently
verify the programming of a DYB for a given sector
group.
µµ
After programming a PPB, two ad-
The programming of
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