ECT25S40 datasheet(31/46 Pages) E-CMOS

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4L08N-Rev.F001

ECT25S40

4M BIT SPI NOR FLASH

Program and Erase Instructions

Page Program (02H)

The Page Program instruction is for programming the memory. A Write Enable instruction

Must previously have been executed to set the Write Enable Latch bit before sending the Page

Program instruction.

See Figure27, the Page Program instruction is entered by driving /CS Low, followed by the

instruction code, 3-byte address and at least one data byte on SI. 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). /CS must be driven low for the entire

duration of the sequence. The Page Program instruction sequence: /CS goes low sending

Page Program instruction 3-byte address on SI at least 1 byte data on SI /CS goes high. 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. /CS must be driven high after the eighth bit of the last data byte has

been latched in; otherwise the Page Program instruction is not executed.

As soon as /CS 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 A Page Program

instruction applied to a page which is protected by the Block

Protect (SEC, TB, BP2, BP1, BP0) is not executed.

Figure 27. Page Program Sequence Diagram

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