8

3608C–FLASH–11/06

AT49BV640D(T)

4.9.3

Sector Protection Detection

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

tures 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, softlocked, or hardlocked.

4.10

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

command is given, the device requires a maximum time of 15 µs to suspend the erase opera-

tion. 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 command. 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 command is a one-bus cycle command. The only valid commands while

erase is suspended are Read Status Register, Product ID Entry, CFI Query, Program, Pro-

gram Resume, Erase Resume, Sector Softlock/Hardlock, and Sector Unlock.

4.11

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 10 µs to suspend the programming operation. After

the programming operation has been suspended, the system can then read 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. Read, Read Status Register, Product ID

Entry, Program Resume are valid commands during a Program Suspend.

4.12

Product Identification

The product identification mode identifies the device and manufacturer as Atmel

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

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