A25LS512A datasheet(19/43 Pages) AMICC

19 / 43 page

A25LS512A Series

(November, 2014, Version 1.1)

AMIC Technology Corp.

Page Program (PP)

The Page Program (PP) instruction allows bytes to be

programmed in the memory (changing bits from 1 to 0).

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 Page Program (PP) instruction is entered by driving Chip

Select ( S ) Low, followed by the instruction code, three

address bytes and at least one data byte on Serial Data Input

(DIO). If the 8 least significant address bits (A7-A0) are not all

zero, all transmitted data that goes beyond the end of the

current page are programmed from the start address of the

same page (from the address whose 8 least significant bits

(A7-A0) are all zero). Chip Select ( S ) must be driven Low for

the entire duration of the sequence.

The instruction sequence is shown in Figure 12. If more than

256 bytes are sent to the device, previously latched data are

discarded and the last 256 data bytes are guaranteed to be

programmed correctly within the same page. If less than 256

Data bytes are sent to device, they are correctly programmed

at the requested addresses without having any effects on the

other bytes of the same page.

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

last data byte has been latched in, otherwise the Page

Program (PP) instruction is not executed.

As soon as Chip Select ( S ) is driven High, the self-timed

Page Program cycle (whose duration is tPP) is initiated. While

the Page Program 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

Page Program 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.

A Page Program (PP) instruction applied to a page which is

protected by the Block Protect (BP2, BP1, BP0) bits (see

table 1and table 2.) is not executed.

Figure 12. Page Program (PP) Instruction Sequence

DIO

Instruction

MSB

810

01 2 3 4 5 6 7

24-Bit Address

28 29 30 31 32 33 34 35 36 37 38 39

23 22 21

3 21 0

Data Byte 1

MSB

7 6 54 32 1 0

Data Byte 256

53 54

Data Byte 3

Data Byte 2

MSB

7 6 54 32 1

MSB

7 6 54 32 1 0

MSB

7 6 54 32 1 0

DIO

Note: Address bits A23 to A16 are Don’t Care, for A25LS512A.

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