AM29BDD160G datasheet(46/79 Pages) AMD

46 / 79 page

Am29BDD160G

June 7, 2006

PPB Status

The programming of the PPB for a given sector can be

verified by writing a PPB status verify command to the

device.

PPB Lock Bit Status

The programming of the PPB Lock Bit for a given sec-

tor can be verified by writing a PPB Lock Bit status

verify command to the device.

Non-volatile Protection Bit Program And

Erase Flow

The device uses a standard command sequence for

programming or erasing the SecSi Sector Protection,

Password Locking, Persistent Sector Protection Mode

Locking, or Persistent Protection Bits. Unlike devices

that have the Single High Voltage Sector Unpro-

tect/Protect feature, the Am29BDD160 has the stan-

dard two-cycle unlock followed by 60h, which places

the device into non-volatile bit program or erase mode.

Once the mode is entered, the specific non-volatile bit

status is read on DQ0. Figure 4 shows a typical flow

for programming the non-volatile bit and Figure 5

shows a typical flow for erasing the non-volatile bits.

The SecSi Sector Protection, Password Locking, Per-

sistent Sector Protection Mode Locking bits are not

erasable after they are programmed. However, the

PPBs are both erasable and programmable (depend-

ing upon device security).

Unlike Single High Voltage Sector Protect/Unprotect,

the A6 pin no longer functions as the program/erase

selector nor the program/erase margin enable. In-

stead, this function is accomplished by issuing the

specific command for either program (68h) or erase

(60h).

In asynchronous mode, the DQ6 toggle bit indicates

whether the program or erase sequence is active. (In

synchronous mode, ADV# indicates the status.) If the

DQ6 toggle bit toggles with either OE# or CE#, the

non-volatile bit program or erase operation is in

progress. When DQ6 stops toggling, the value of the

non-volatile bit is available on DQ0.

AM29BDD160G 데이터시트(PDF) 46 Page - Advanced Micro Devices

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