S29PL-J55BAI011 datasheet(62/96 Pages) SPANSION

62 / 96 page

S29PL-J

S29PL-J_00_A9 September 22, 2006

Data

Sheet

(Adv an ce

Inf o r m a t io n)

15.8

Erase Suspend/Erase Resume Commands

The Erase Suspend command, B0h, allows the system to interrupt a sector erase operation and then read

data from, or program data to, any sector not selected for erasure. The bank address is required when writing

this command. This command is valid only during the sector erase operation, including the 80 µs time-out

period during the sector erase command sequence. The Erase Suspend command is ignored if written during

the chip erase operation or Embedded Program algorithm.

When the Erase Suspend command is written during the sector erase operation, the device requires a

maximum of 35 µs to suspend the erase operation. However, when the Erase Suspend command is written

during the sector erase time-out, the device immediately terminates the time-out period and suspends the

erase operation. Addresses are “don’t-cares” when writing the Erase suspend command.

After the erase operation has been suspended, the bank enters the erase-suspend-read mode. The system

can read data from or program data to any sector not selected for erasure. (The device “erase suspends” all

sectors selected for erasure.) Reading at any address within erase-suspended sectors produces status

information on DQ7–DQ0. The system can use DQ7, or DQ6 and DQ2 together, to determine if a sector is

actively erasing or is erase-suspended. Refer to Write Operation Status on page 64 for information on these

status bits.

After an erase-suspended program operation is complete, the bank returns to the erase-suspend-read mode.

The system can determine the status of the program operation using the DQ7 or DQ6 status bits, just as in

the standard Word Program operation. Refer to Write Operation Status on page 64 for more information.

In the erase-suspend-read mode, the system can also issue the autoselect command sequence. The device

allows reading autoselect codes even at addresses within erasing sectors, since the codes are not stored in

the memory array. When the device exits the autoselect mode, the device reverts to the Erase Suspend

mode, and is ready for another valid operation. Refer to Table 10.9, Secured Silicon Sector Addresses

on page 39 and Autoselect Command Sequence on page 56 for details.

To resume the sector erase operation, the system must write the Erase Resume command (address bits are

don’t care). The bank address of the erase-suspended bank is required when writing this command. Further

writes of the Resume command are ignored. Another Erase Suspend command can be written after the chip

has resumed erasing.

If the Persistent Sector Protection Mode Locking Bit is verified as programmed without margin, the Persistent

Sector Protection Mode Locking Bit Program Command should be reissued to improve program margin. If the

Secured Silicon Sector Protection Bit is verified as programmed without margin, the Secured Silicon Sector

Protection Bit Program Command should be reissued to improve program margin. µµAfter programming a

PPB, two additional cycles are needed to determine whether the PPB has been programmed with margin. If

the PPB has been programmed without margin, the program command should be reissued to improve the

program margin. Also note that the total number of PPB program/erase cycles is limited to 100 cycles.

Cycling the PPBs beyond 100 cycles is not guaranteed.

After erasing the PPBs, two additional cycles are needed to determine whether the PPB has been erased

with margin. If the PPBs has been erased without margin, the erase command should be reissued to improve

the program margin. The programming of either the PPB or DYB for a given sector or sector group can be

verified by writing a Sector Protection Status command to the device.

Note that there is no single command to independently verify the programming of a DYB for a given sector

group.

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