13

AT25DF161

Figure 8-3.

Dual-Input Byte Program

Figure 8-4.

Dual-Input Page Program

8.3

Block Erase

A block of 4-, 32-, or 64-Kbytes can be erased (all bits set to the logical “1” state) in a single operation by using one of

three different opcodes for the Block Erase command. An opcode of 20h is used for a 4-Kbyte erase, an opcode of 52h is

used for a 32-Kbyte erase, and an opcode of D8h is used for a 64-Kbyte erase. Before a Block Erase command can be

started, the Write Enable command must have been previously issued to the device to set the WEL bit of the Status

Register to a logical “1” state.

To perform a Block Erase, the CS pin must first be asserted and the appropriate opcode (20h, 52h, or D8h) must be

clocked into the device. After the opcode has been clocked in, the three address bytes specifying an address within the 4-

, 32-, or 64-Kbyte block to be erased must be clocked in. Any additional data clocked into the device will be ignored. When

the CS pin is deasserted, the device will erase the appropriate block. The erasing of the block is internally self-timed and

Since the Block Erase command erases a region of bytes, the lower order address bits do not need to be decoded by the

device. Therefore, for a 4-Kbyte erase, address bits A11-A0 will be ignored by the device and their values can be either a

logical “1” or “0”. For a 32-Kbyte erase, address bits A14-A0 will be ignored, and for a 64-Kbyte erase, address bits

A15-A0 will be ignored by the device. Despite the lower order address bits not being decoded by the device, the

complete three address bytes must still be clocked into the device before the CS pin is deasserted, and the CS pin must be

deasserted on an even byte boundary (multiples of eight bits); otherwise, the device will abort the operation and no erase

operation will be performed.

SCK

CS

SOI

SI

SCK

CS

SOI

SI

3687H–DFLASH–5/2013