A25LS512A datasheet(22/43 Pages) AMICC

22 / 43 page

A25LS512A Series

(November, 2014, Version 1.1)

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 Bulk 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

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 (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

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