AT52SC1283J datasheet(12/52 Pages) ATMEL

12 / 52 page

3530B–STKD–2/4/05

AT52SC1283J/1284J [Preliminary]

6.14

Erase Suspend/Erase Resume

The Erase Suspend command allows the system to interrupt a sector erase or plane erase oper-

ation. The erase suspend command does not work with the Chip Erase feature. Using the erase

suspend command to suspend a sector erase operation, the system can program or read data

from a different sector within the same plane. Since this device is organized into thirty-two

planes, there is no need to use the erase suspend feature while erasing a sector when you want

to read data from a sector in another plane. After the Erase Suspend command is given, the

device requires a maximum time of 15 µs to suspend the erase operation. After the erase opera-

tion has been suspended, the plane that contains the suspended sector enters the erase-

suspend-read mode. 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, which does require the plane address. Read, Read Status Register, Product ID

Entry, Clear Status Register, Program, Program Suspend, Erase Resume, Sector Soft-

lock/Hardlock, Sector Unlock are valid commands during an erase suspend.

6.15

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 pro-

gram 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, Pro-

gram Resume are valid commands during a Program Suspend.

6.16

Protection Registers

The AT52SC1283J/1284J contains two (PR0 - PR1) registers that can be used for security pur-

poses in system design. Please see “Protection Register Addressing Table” on page 20 for the

address locations within each protection register. The first protection register (PR0) 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. The other register (PR1) has 2,048 bits (128 words) that are all user programmable.

To program block B in PR0 or to program PR1 register, a two-bus cycle command must be used

as shown in the Command Definition table on page 19. To lock out block B in PRO or to lock out

PR1, a two-bus cycle command must also be used as shown in the Command Definition table.

To lock out block B in PRO, the address used in the second bus cycle is 080h and data bit D1

must be zero during the second bus cycle. All other data bits during the second bus cycle are

don’t cares. To lock out PR1, the address used in the second bus cycle is 089h, and sixteen bits

of data are programmed. If all of these bits are programmed to a zero, the register is locked.

After being locked, the protection register cannot be unlocked. To determine whether block B in

PRO or PR1 is locked out, the Status of Protection PR0 (block B) or PR1 command is given. For

block B in PRO, if data bit D1 is zero, block B is locked. If data bit D1 is one, block B can be

reprogrammed. For PR1, sixteen bits of data are read out. If all sixteen bits are 0s, the register is

locked. To read a protection register, the Product ID Entry command is given followed by a nor-

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