29PL256N datasheet(33/74 Pages) SPANSION

33 / 74 page

June 6, 2007 S29PL-N_00_A5

S29PL-N MirrorBit

™ Flash Family

Da ta

Shee t

(Prelim i nar y )

7.4.5

Erase Suspend/Erase Resume Commands

The Erase Suspend command 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 minimum tSEA time-out

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

the chip erase operation.

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

maximum of tESL (erase suspend latency) 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.

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 Table 7.18 on page 40 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 program operation.

In the erase-suspend-read mode, the system can also issue the Autoselect command sequence. See Write

Buffer Programming on page 27 and Autoselect on page 23 for details.

To resume the sector erase operation, the system must write the Erase Resume command. 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.

Software Functions and Sample Code

The following is a C source code example of using the erase suspend function. Refer to the Spansion Low

Level Driver User’s Guide (available on www.spansion.com) for general information on Spansion Flash

memory software development guidelines.

/* Example: Erase suspend command */

*((UINT16 *)bank_addr + 0x000) = 0x00B0;

/* write suspend command

The following is a C source code example of using the erase resume function. Refer to the Spansion Low

Level Driver User’s Guide (available on www.spansion.com) for general information on Spansion Flash

memory software development guidelines.

/* Example: Erase resume command */

*((UINT16 *)bank_addr + 0x000) = 0x0030;

/* write resume command

/* The flash needs adequate time in the resume state */

Table 7.11 Erase Suspend

(LLD Function = lld_EraseSuspendCmd)

Cycle

Operation

Word Address

Data

Write

Bank Address

00B0h

Table 7.12 Erase Resume

(LLD Function = lld_EraseResumeCmd)

Cycle

Operation

Word Address

Data

Write

Bank Address

0030h

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