7
3656A–FLASH–2/07
AT49SV163D(T)
4.9 Erase Suspend/Erase Resume
The Erase Suspend command allows the system to interrupt a sector or chip erase operation
and then program or read data from a different sector within the memory. After the Erase Sus-
pend command 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 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 suspend 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 suspend and a sector erase suspend are the same.
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 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
suspend and program suspend are the same, and the command sequence for the erase
resume and program resume are the same.
4.11 Product Identification
The product identification mode identifies the device and manufacturer as Atmel
®
. It is
accessed using a software operation.
For details, see “Operating Modes” on page 16 or “Software Product Identification Entry/Exit”
sections on page 23.
4.12 128-bit Protection Register
The AT49SV163D(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
protection register, the four-bus cycle Program Protection Register command must be used as
shown in the “Command Definition Table” on page 12. To lock out block B, the four-bus cycle
Lock Protection Register command must be used as shown in the “Command Definition
Table” . Data bit D1 must be zero during the fourth bus cycle. All other data bits during the
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. Please see the “Protec-
tion Register Addressing Table” on page 13 for the address locations in the protection register.
To read the 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 performing any other operation.
