at49sv322a ATMEL Corporation, at49sv322a Datasheet - Page 8

• Manufacturer Part Number: at49sv322a
• Description: 32-megabit 2m X 16/4m X 8 1.8-volt Only Flash Memory
• Manufacturer: ATMEL Corporation

4.10
4.11
4.12
8
Program Suspend/Program Resume
Product Identification
128-Bit Protection Register
AT49SV322A(T)
gram 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 device also supports an erase sus-
pend during a complete chip erase. While the chip erase is suspended, the user can read from
any sector within the memory that is protected. The command sequence for a chip erase sus-
pend and a sector erase suspend are the same.
The Program Suspend command allows the system to interrupt a programming operation and
then read data from a different byte/word within the memory. After the Program Suspend com-
mand 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 byte/word that is not contained in the sector in which the programming operation was sus-
pended. 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 sus-
pend and program suspend are the same, and the command sequence for the erase resume
and program resume are the same.
The product identification mode identifies the device and manufacturer as Atmel. It may be
accessed by hardware or software operation. The hardware operation mode can be used by an
external programmer to identify the correct programming algorithm for the Atmel product.
For details, see
Identification Entry/Exit” on page
modes.
The AT49SV322A(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 blocks. The two blocks are
designated as block A and block B. The data in block A is non-changeable and is programmed
at the factory with a unique number. The data in block B is programmed by the user and can be
locked out such that data in the block cannot be reprogrammed. To program block B in the pro-
tection register, the four-bus cycle Program Protection Register command must be used as
shown in the
Lock Protection Register command must be used as shown in the
on page
fourth bus cycle are don’t cares. To determine whether block B is locked out, the Product ID
Entry command is given followed by a read operation from address 80H. If data bit D1 is zero,
block B is locked. If data bit D1 is one, block B can be reprogrammed. See
Addressing Table” on page 14
protection register, the Product ID Entry command is given followed by a normal read operation
from an address within the protection register. After determining whether block B is protected or
not, or reading the protection register, the Product ID Exit command must be given prior to per-
forming any other operation.
13. Data bit D1 must be zero during the fourth bus cycle. All other data bits during the
“Command Definition Table” on page
“Operating Modes” on page 19
for the address locations in the protection register. To read the
26). The manufacturer and device codes are the same for both
(for hardware operation) or
13. To lock out block B, the four-bus cycle
“Command Definition Table”
“Protection Register
(“Software Product
3360E–FLASH–10/05