AT52BC1661A データシートの表示（PDF） - Atmel Corporation

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AT52BC1661A

16-Mbit Flash + 8-Mbit PSRAM Stack Memory

Atmel Corporation 

At power-up or reset, all sectors are unlocked. To activate the lockdown for a specific sector,

the six-bus cycle Sector Lockdown command must be issued. Once a sector has been locked

down, the contents of the sector is read-only and cannot be erased or programmed.

SECTOR LOCKDOWN DETECTION: A software method is available to determine if program-

ming of a sector is locked down. When the device is in the software product identification

mode (see “Software Product Identification Entry/Exit” sections on page 23), a read from

address location 00002H within a sector will show if programming the sector is locked down. If

the data on I/O0 is low, the sector can be programmed; if the data on I/O0 is high, the program

lockdown feature has been enabled and the sector cannot be programmed. The software

product identification exit code should be used to return to standard operation.

SECTOR LOCKDOWN OVERRIDE: The only way to unlock a sector that is locked down is

through reset or power-up cycles. After power-up or reset, the content of a sector that is

locked down can be erased and reprogrammed.

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 Suspend command is given, the device requires a maxi-

mum 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 pro-

tected. The command sequence for a chip erase suspend and a sector erase suspend are the

same.

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 suspended. 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 com-

mands. 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.

PRODUCT IDENTIFICATION: The product identification mode identifies the device and man-

ufacturer 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 “Operating Modes” on page 16 (for hardware operation) or “Software Product

Identification Entry/Exit” sections on page 23. The manufacturer and device codes are the

same for both modes.

128-BIT PROTECTION REGISTER: The device contains a 128-bit register that can be used

for security purposes in system 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 repro-

grammed. 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 in Hex”

table on page 13. To lock out block B, the four-bus cycle Lock Protection Register command

8 AT52BC1661A(T) [Preliminary]

3455A–STKD–11/04

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