AM29PDL129H datasheet(25/49 Pages) SPANSION

25 / 49 page

November 2, 2005

Am29PDL129H

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.

Figure 4.

SecSi Sector Protect Verify

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.

Table 10.

CFI Query Identification String

Addresses

Data

Description

Write 60h to

any address

Write 40h to SecSi

Sector address

with A6 = 0,

A1 = 1, A0 = 0

START

RESET# =

VIH or VID

Wait 1

μs

Read from SecSi

Sector address

with A6 = 0,

A1 = 1, A0 = 0

If data = 00h,

SecSi Sector is

unprotected.

If data = 01h,

SecSi Sector is

protected.

Remove VIH or VID

from RESET#

Write reset

command

SecSi Sector

Protect Verify

complete

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