S29GL01GP datasheet(30/81 Pages) SPANSION

30 / 81 page

S29GL-P MirrorBit® Flash Family

S29GL-P_00_A14 October 22, 2012

Da ta

Sh e e t

7.7.3

Sector Erase

The sector erase function erases one or more sectors in the memory array. (See Table 12.1 on page 69 and

Figure 7.3.) The device does not require the system to preprogram a sector prior to erase. The Embedded

Erase algorithm automatically programs and verifies the entire memory to an all zero data pattern prior to

electrical erase. After a successful sector erase, all locations within the erased sector contain FFFFh. The

system is not required to provide any controls or timings during these operations.

After the command sequence is written, the sector erase time-out tSEA (50 µs) occurs. During the time-out

period, additional sector addresses may be written. Loading the sector erase buffer may be done in any

sequence, and the number of sectors may be from one sector to all sectors. The time between these

additional cycles must be less than 50 µs. Any sector erase address and command following the exceeded

time-out (50 µs) may or may not be accepted. Any command other than Sector Erase or Erase Suspend

during the time-out period resets that sector to the read mode. The system can monitor DQ3 to determine if

the sector erase timer has timed out (See Section 7.8.6.) The time-out begins from the rising edge of the final

WE# pulse in the command sequence.

When the Embedded Erase algorithm is complete, the sector returns to reading array data and addresses are

no longer latched. The system can determine the status of the erase operation by reading DQ7 or DQ6/DQ2

in the erasing sector. Refer to Section 7.8 for information on these status bits.

Once the sector erase operation has begun, only the Erase Suspend command is valid. All other commands

are ignored. However, note that a hardware reset immediately terminates the erase operation. If that occurs,

the sector erase command sequence should be reinitiated once that sector has returned to reading array

data, to ensure the sector is properly erased.

The Unlock Bypass feature allows the host system to send program commands to the Flash device without

first writing unlock cycles within the command sequence. See Section 7.7.8 for details on the Unlock Bypass

function.

Figure 7.3 illustrates the algorithm for the erase operation. Refer to Section 11.7.5 for parameters and timing

diagrams.

Software Functions and Sample Code

The following is a C source code example of using the sector erase 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: Sector Erase Command */

*( (UINT16 *)base_addr + 0x555 ) = 0x00AA;

/* write unlock cycle 1

*( (UINT16 *)base_addr + 0x2AA ) = 0x0055;

/* write unlock cycle 2

*( (UINT16 *)base_addr + 0x555 ) = 0x0080;

/* write setup command

*( (UINT16 *)base_addr + 0x555 ) = 0x00AA;

/* write additional unlock cycle 1 */

*( (UINT16 *)base_addr + 0x2AA ) = 0x0055;

/* write additional unlock cycle 2 */

*( (UINT16 *)sector_address )

= 0x0030;

/* write sector erase command

Table 7.8 Sector Erase

(LLD Function = lld_SectorEraseCmd)

Cycle

Description

Operation

Byte Address

Word Address

Data

Unlock

Write

Base + AAAh

Base + 555h

00AAh

Unlock

Write

Base + 555h

Base + 2AAh

0055h

Setup Command

Write

Base + AAAh

Base + 555h

0080h

Unlock

Write

Base + AAAh

Base + 555h

00AAh

Unlock

Write

Base + 555h

Base + 2AAh

0055h

Sector Erase Command

Write

Sector Address

0030h

Unlimited additional sectors may be selected for erase; command(s) must be written within 50 µs.

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