S29GL01GP datasheet(33/81 Pages) SPANSION

33 / 81 page

October 22, 2012 S29GL-P_00_A14

S29GL-P MirrorBit® Flash Family

Data

She e t

7.7.5

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 sector addresses are “don't-cares” when

writing this command. This command is valid only during the sector erase operation, including the 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 20 µs (5 µs typical) 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 device 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 7.35 for information on these status bits.

After an erase-suspended program operation is complete, the device returns to the erase-suspend-read

mode. The system can determine the status of the program operation using write operation status bits, just as

in the standard program operation.

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

Write Buffer Programming on page 26 and the Autoselect on page 21 for details.

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

the erase-suspended sector is a “don't-care” 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 *)base_addr ) = 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 *)sector_addr ) = 0x0030;

/* write resume command

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

Table 7.10 Erase Suspend

(LLD Function = lld_EraseSuspendCmd)

Cycle

Operation

Byte Address

Word Address

Data

Write

Base + XXXh

00B0h

Table 7.11 Erase Resume

(LLD Function = lld_EraseResumeCmd)

Cycle

Operation

Byte Address

Word Address

Data

Write

Sector Address

0030h

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