PM25LV040-33QC データシートの表示（PDF） - PMC-Sierra, Inc

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PM25LV040-33QC

1 Mbit / 2 Mbit / 4 Mbit 3.0 Volt-only, Serial Flash Memory With 33 MHz SPI Bus Interface

PMC-Sierra, Inc 

PMC

Pm25LV010/020/040

DEVICE OPERATION (CONTINUED)

PAGE PROGRAM OPERATION

The Page Program (PAGE_PROG) instruction allow up

to 256 bytes data to be programmed into memory in one

program operation page by page. The destination of the

memory to be programmed must be outside the pro-

tected memory area set by the Block Protection (BP2,

BP1, BP0) bits. A PAGE_PROG instruction attemps to

program into a page which is write protected will be

ignored. Before the execution of PAGE_PROG

instruction, the Write Enable Latch (WEL) must be en-

abled through a Write Enable (WREN) instruction.

The PAGE_PROG instruction is activated, after the CE#

is pulled low to select the device and staying low during

the entire instruction sequence, by shifting in the

PAGE_PROG instruction code, three address bytes and

program data (1 to 256 bytes) to be programmed via the

Sl 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 tim-

ing. 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 through a RDSR

instruction. If WIP bit = “1”, the program operation is still

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

completed.

A single PAGE_PROG instruction programs 1 to 256

consecutive bytes within a page if it is not write protected.

If more than 256 bytes data are sent to the devices, the

address counter will roll over on the same page and 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 same 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.

A program operation can alter “1”s into “0”s, but an erase

operation is required to change “0”s back to “1”s. The

same byte cannot be reprogrammed without erasing the

whole sector or block first.

Figure 13. Page Program Sequence

CE#

0 1 2 3 4 5 6 7 8 9 10 11 28 29 30 31 32 33 34

SCK

3-BYTE ADDRESS

1st BYTE DATA-IN

256th BYTE DATA-IN

SI

INSTRUCTION = 0000 0010b 23 22 21 3 2 1 0 7 6 5 4 3 2 1 0

HIGH IMPEDANCE

SO

Programmable Microelectronics Corp.

18

Issue Date: July, 2005, Rev: 1.2

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