at49bv320ct ATMEL Corporation, at49bv320ct Datasheet - Page 8

• Manufacturer Part Number: at49bv320ct
• Description: 32-megabit 2m X 16 3-volt Only Flash Memory
• Manufacturer: ATMEL Corporation

4.8.3
4.9
4.10
4.11
4.12
8
Erase Suspend/Erase Resume
Program Suspend/Program Resume
Product Identification
128-bit Protection Register
AT49BV320C(T)
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.
Table 4-3.
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.
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.
The product identification mode identifies the device and manufacturer as Atmel. It may be
accessed by a software operation. For details, see
The AT49BV320C(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
I/O1
0
0
1
1
Sector Protection Status
I/O0
0
1
0
1
Sector Protection Status
Sector Not Locked
Softlock Enabled
Hardlock Enabled
Both Hardlock and Softlock Enabled
“Operating Modes” on page
21.
3372F–FLASH–4/05