8

3581C–FLASH–11/05

AT49BV320D(T)

4.8.3

Sector Protection Detection

A software method is available to determine if the sector protection Softlock or Hardlock features

are enabled. When the device is in the software product identification mode, a read from the

I/O0 and I/O1 at address location 00002H within a sector will show if the sector is unlocked, soft-

locked, or hardlocked.

4.9

Erase Suspend/Erase Resume

The Erase Suspend command allows the system to interrupt a sector erase operation and then

program or read data from a different sector within the memory. After the Erase Suspend com-

mand is given, the device requires a maximum time of 15 µs to suspend the erase operation.

After the erase operation has been suspended, the system can then read data or program data

to any other sector within the device. An address is not required during the Erase Suspend com-

mand. During a sector erase suspend, another sector cannot be erased. To resume the sector

erase operation, the system must write the Erase Resume command. The Erase Resume com-

mand is a one-bus cycle command. The only valid commands while erase is suspended are

Read Status Register, Product ID Entry, CFI Query, Program, Program Resume, Erase

Resume, Sector Softlock/Hardlock, Sector Unlock.

4.10

Program Suspend/Program Resume

The Program Suspend command allows the system to interrupt a programming operation and

then read data from a different word within the memory. After the Program Suspend command is

given, the device requires a maximum of 20 µs to suspend the programming operation. After the

programming operation has been suspended, the system can then read data from any other

word within the device. An address is not required during the program suspend operation. To

resume the programming operation, the system must write the Program Resume command. The

program suspend and resume are one-bus cycle commands. The command sequence for the

erase suspend and program suspend are the same and the command sequence for the erase

resume and program resume are the same. The only other valid commands while program is

suspended are Read Status Register, Product ID Entry, CFI Query and Program Resume.

4.11

Product Identification

The product identification mode identifies the device and manufacturer as Atmel. It may be

accessed by a software operation. For details, see “Operating Modes” on page 21.

4.12

128-bit Protection Register

The AT49BV320D(T) contains a 128-bit register that can be used for security purposes in sys-

tem design. The protection register is divided into two 64-bit sectors. The two sectors are

designated as sector A and sector B. The data in sector A is non-changeable and is pro-

grammed at the factory with a unique number. The data in sector B is programmed by the user

and can be locked out such that data in the sector cannot be reprogrammed. To program sector

Table 4-3.

Sector Protection Status

I/O1

I/O0

Sector Protection Status

0

0

Sector Not Locked

0

1

Softlock Enabled

1

0

Hardlock Enabled

1

1

Both Hardlock and Softlock Enabled