PM25LD512 datasheet(20/33 Pages) ETC2

Part #	PM25LD512

Description	512Kbit/1 Mbit / 2 Mbit Single Operating Voltage Serial Flash Memory With 100 MHz Dual-Output SPI Bus

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Pm25LD512/010/ 020

Confidential information

Chingis Technology Corp.

20

DRAFT Date: August, 2010, Rev:0.4

DEVICE OPERATION (CONTINUED)

PAGE_PROG COMMAND (PAGE PROGRAM) OPERATION

The Page Program (PAGE_PROG) instruction allows

up to 256 bytes data to be programmed into memory in

a single operation. The destination of the memory to be

programmed must be outside the protected memory

area set by the Block Protection (BP2, BP1, BP0) bits.

A PAGE_PROG instruction which attempts to program

into a page that is write-protected will be ignored.

Before the execution of PAGE_PROG instruction, the

Write Enable Latch (WEL) must be enabled through a

Write Enable (WREN) instruction.

The PAGE_PROG instruction code, three address

bytes and program data (1 to 256 bytes) are input via

the SlO line. Program operation will start immediately

after the CE# is brought high, otherwise the

PAGE_PROG instruction will not be executed. The

internal control logic automatically handles the

programming voltages and timing. During a program

operation, all instructions will be ignored except the

RDSR instruction. The progress or completion of the

program operation can be determined by reading the

WIP bit in Status Register via a RDSR instruction. If

the WIP bit is “1”, the program operation is still in

progress. If WIP bit is “0”, the program operation has

completed.

If more than 256 bytes data are sent to a device, the

address counter rolls over within the same page, the

previously latched data are discarded, and the last 256

bytes data are kept to be programmed into the page.

The starting byte can be anywhere within the page.

When the end of the page is reached, the address will

wrap around to the beginning of the same page. If the

data to be programmed are less than a full page, the

data of all other bytes on the same page will remain

unchanged.

Note: A program operation can alter “1”s into “0”s, but

an erase operation is required to change “0”s back to

“1”s. A byte cannot be reprogrammed without first

erasing the whole sector or block.

Figure 15. Page Program Sequence

SIO

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