A25L080 datasheet(23/41 Pages) AMICC

23 / 41 page

A25L016 Series

(April, 2008, Version 0.0)

AMIC Technology Corp.

Chip Erase (CE)

The Chip Erase (CE) instruction sets all bits to 1 (FFh). Before

it can be accepted, a Write Enable (WREN) instruction must

previously have been executed. After the Write Enable

(WREN) instruction has been decoded, the device sets the

Write Enable Latch (WEL).

The Chip Erase (CE) instruction is entered by driving Chip

Select ( S ) Low, followed by the instruction code on Serial

Data Input (DIO). Chip Select ( S ) must be driven Low for the

entire duration of the sequence.

The instruction sequence is shown in Figure 15. Chip Select

( S ) must be driven High after the eighth bit of the instruction

code has been latched in, otherwise the Block Erase

instruction is not executed. As soon as Chip Select ( S ) is

driven High, the self-timed Chip Erase cycle (whose duration

is tCE) is initiated. While the Chip Erase cycle is in progress,

the Status Register may be read to check the value of the

Write In Progress (WIP) bit. The Write In Progress (WIP) bit is

1 during the self-timed Chip Erase cycle, and is 0 when it is

completed. At some unspecified time before the cycle is

completed, the Write Enable Latch (WEL) bit is reset.

The Chip Erase (CE) instruction is executed only if all Block

Protect (TB, BP2, BP1, BP0) bits are 0. The Chip Erase (CE)

instruction is ignored if one, or more, blocks are protected.

Figure 15. Chip Erase (CE) Instruction Sequence

DIO

1 2 3 45 6 7

Instruction

Note:. Address bits A23 to A21 are Don’t Care, for A25L016

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