S25FL256SDPNFAQ datasheet(108/149 Pages) CYPRESS

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Document Number: 001-98283 Rev. *M

Page 107 of 148

S25FL128S/S25FL256S

Figure 71. Parameter Sector Erase Command Sequence (3-Byte Address, 20h)

Figure 72. Parameter Sector Erase Command Sequence (ExtAdd = 1, 20h or 4-Byte Address, 21h)

9.6.2

Sector Erase (SE D8h or 4SE DCh)

The Sector Erase (SE) command sets all bits in the addressed sector to 1 (all bytes are FFh). Before the Sector Erase (SE)

command can be accepted by the device, a Write Enable (WREN) command must be issued and decoded by the device, which sets

the Write Enable Latch (WEL) in the Status Register to enable any write operations.

The instruction



D8h [ExtAdd=0] is followed by a 3-byte address (A23-A0), or



D8h [ExtAdd=1] is followed by a 4-byte address (A31-A0), or



DCh is followed by a 4-byte address (A31-A0)

CS# must be driven into the logic high state after the twenty-fourth or thirty-second bit of address has been latched in on SI. This will

initiate the erase cycle, which involves the pre-programming and erase of the chosen sector. If CS# is not driven high after the last

bit of address, the sector erase operation will not be executed.

As soon as CS# is driven into the logic high state, the internal erase cycle will be initiated. With the internal erase cycle in progress,

the user can read the value of the Write-In Progress (WIP) bit to check if the operation has been completed. The WIP bit will indicate

a 1 when the erase cycle is in progress and a0 when the erase cycle has been completed.

A Sector Erase (SE) command applied to a sector that has been Write Protected through the Block Protection bits or ASP, will not

be executed and will set the E_ERR status.

A device ordering option determines whether the SE command erases 64 kbytes or 256 kbytes. The option to use this command to

always erase 256 kbytes provides for software compatibility with higher density and future S25FL family devices.

ASP has a PPB and a DYB protection bit for each sector, including any 4-kB sectors. If a sector erase command is applied to a 64-

kB range that includes a protected 4-kB sector, or to a 256-kB range that includes a 64-kB protected address range, the erase will

not be executed on the range and will set the E_ERR status.

Instruction

24 Bit Address

SCK

MSB

CS #

Instruction

32 Bit Address

SCK

MSB

CS #

S25FL256SDPNFAQ Datasheet(PDF) 108 Page - Cypress Semiconductor