ATXP032 datasheet(35/113 Pages) DIALOG

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ATXP032

DS-ATXP032–114I–4-2020

Figure 9-11. Buffer to Main Memory Page Program without Built-In Erase in Octal Mode — SDR

Figure 9-12. Buffer to Main Memory Page Program without Built-In Erase in Octal Mode — DDR

9.4

Block Erase

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

three different commands for the Block Erase command. The 20h command is used for a 4-Kbyte erase, the 52h

command for a 32-Kbyte erase, and the D8h command 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/Control register to a logic “1” state.

To perform a block erase operation, the CS pin must first be asserted and the appropriate command (20h, 52h, or

D8h) must be clocked into the device. After the command has been clocked in, the four 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 is ignored.

When the CS pin is deasserted, the device erases the appropriate block. The erasing of the block is internally self-

timed and should take place in a time of t

BLKE.

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 A

11 - A0 are ignored by the device and their values can

be either a logic “1” or “0”. For a 32-Kbyte erase, address bits A

14 - A0 are ignored by the device. For a 64-Kbyte

erase, address bits A

15 - A0 are ignored by the device. Despite the lower order address bits not being decoded by

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

and the CS pin must be deasserted on a whole byte boundary (multiples of eight bits), Otherwise, the device aborts

the operation and no erase operation is performed.

If the memory is in the protected state, then the Block Erase command is not executed, and the device returns to

the idle state once the CS pin has been deasserted.

A23-16

A15-8

A7-0

A31-24

Address

88h

Opcode

I/O7-0

SCK

Address

Bits A

-A

88h

Opcode

I/O7-0

SCK

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