SST25PF040C datasheet(5/47 Pages) MICROCHIP

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DS20005397F-page 5

SST25PF040C

3.0

MEMORY ORGANIZATION

The SST25PF040C SuperFlash memory arrays are

organized in 128 uniform 4-Kbyte sectors, with eight

64-Kbyte overlay erasable blocks.

FIGURE 3-1:

MEMORY MAP

4.0

DEVICE OPERATION

SST25PF040C is accessed through the SPI (Serial

Peripheral Interface) bus compatible protocol. The SPI

bus consist of four control lines: Chip Enable (CE#) is

used to select the device, and data is accessed through

the Serial Data Input (SI), Serial Data Output (SO), and

Serial Clock (SCK).

The SST25PF040C supports both Mode 0 (0,0) and

Mode 3 (1,1) of SPI bus operations. The difference

between the two modes, as shown in Figure 4-1, is the

state of the SCK signal when the bus host is in Stand-

by mode and no data is being transferred. The SCK sig-

nal is low for Mode 0 and SCK signal is high for Mode

3. For both modes, the Serial Data In (SI) is sampled at

the rising edge of the SCK clock signal and the Serial

Data Output (SO) is driven after the falling edge of the

SCK clock signal.

FIGURE 4-1:

SPI PROTOCOL

Top of Memory Block

00FFFFH

00F000H

000FFFH

000000H

001FFFH

001000H

Bottom of Memory Block

01FFFFH

01F000H

01FFFFH

010000H

07FFFFH

07F000H

070FFFH

070000H

Number of Sectors

127

112

Number of 64-Kbyte

Blocks

MODE 3

SCK

CE#

MODE 3

DON'T CARE

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

MODE 0

High-Impediance

MSb

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