AM29PDL129H AMD [Advanced Micro Devices], AM29PDL129H Datasheet - Page 25

• 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]

Once the is locked and verified, the system must write the Exit Region command sequence to return to reading and
writing the remainder of the array.
The must be used with caution since, once locked, there is no procedure available for unlocking the area and none
of the bits in the memory space can be modified in any way.
SecSi Sector Protection Bits
The SecSi Sector Protection Bits prevent programming of the SecSi Sector memory area. Once set, the SecSi
Sector memory area contents are non-modifiable.
COMMON FLASH MEMORY INTERFACE (CFI)
The Common Flash Interface (CFI) specification outlines device and host system software interrogation hand-
shake, which allows specific vendor-specified software algorithms to be used for entire families of devices. Soft-
ware support can then be device-independent, JEDEC ID-independent, and forward- and backward-compatible for
the specified flash device families. Flash vendors can standardize their existing interfaces for long-term compatibil-
ity.
This device enters the CFI Query mode when the system writes the CFI Query command, 98h, to address 55h, any
time the device is ready to read array data. The system can read CFI information at the addresses given in Tables
10–13. To terminate reading CFI data, the system must write the reset command. The CFI Query mode is not ac-
cessible when the device is executing an Embedded Program or embedded Erase algorithm.
The system can also write the CFI query command when the device is in the autoselect mode. The device enters
the CFI query mode, and the system can read CFI data at the addresses given in Tables 10–13. The system must
write the reset command to return the device to reading array data.
For further information, please refer to the CFI Specification and CFI Publication 100, available via the World Wide
Web at http://www.amd.com/flash/cfi. Alternatively, contact an AMD representative for copies of these documents.
November 2, 2005
Addresses
Write 40h to SecSi
Read from SecSi
Sector address
Sector address
A1 = 1, A0 = 0
A1 = 1, A0 = 0
Write 60h to
with A6 = 0,
any address
with A6 = 0,
RESET# =
V
Wait 1 μs
START
IH
or V
ID
Data
Remove V
SecSi Sector is
SecSi Sector is
If data = 00h,
If data = 01h,
from RESET#
Protect Verify
SecSi Sector
unprotected.
Write reset
protected.
command
complete
Table 10. CFI Query Identification String
Figure 4. SecSi Sector Protect Verify
IH
or V
ID
Am29PDL129H
Description
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