SST26WF040BA datasheet(91/96 Pages) MICROCHIP

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 2014-2017 Microchip Technology Inc.

DS20005283C-page 91

SST26WF040B/040BA SST26WF080B/080BA

11.1

Mapping Guidance Details

The SFDP Memory Organization/Block Protection Bit

Mapping defines the memory organization including

uniform sector/block sizes and different contiguous

sectors/blocks sizes. In addition, this bit defines the

number of these uniform and different sectors/blocks

from address 000000H to the full range of Memory and

the associated Block Locking Register bits of each sec-

tor/block.

Each major Section is defined as follows:

A Major Section consists of Sector Type Number, Num-

ber of Sector of this type, and the Block-Protection Bit

Start/End locations. This is tied directly to JEDEC Flash

Parameter Table Sector Size Type (in 7th DWORD and

8th DWORD section). Note that the contiguous 4KByte

Sectors across the full memory range are not included

on this section because they are not defined in the

JEDEC Flash Parameter Table Sector Size Type sec-

tion. Only the sectors/blocks that are dependently tied

with the Block-Protection Register bits are defined. A

major section is a partition of contiguous same-size

sectors/blocks. There will be several Major Sections as

25AH

A23:A16

FEH

Section 4 Block Protection Bit Start

((2m) +1)+ c, c=FEH or -2, m= 4 for 8 Mb

The most significant (left-most) bit indicates the sign of the integer; it is

sometimes called the sign bit. If the sign bit is zero, then the number is

greater than or equal to zero, or positive. If the sign bit is one then the

number is less than zero or negative.

25BH

A31:A24

FEH

Section 4 Block Protection Bit End

((2m) +1)+ c, c=FEH or -2, m= 4 for 8 Mb

The most significant (left-most) bit indicates the sign of the integer; it is

sometimes called the sign bit. If the sign bit is zero, then the number is

greater than or equal to zero, or positive. If the sign bit is one then the

number is less than zero or negative.

25CH

A7:A0

02H

Section 5 Sector Type Number:

Sector type in JEDEC Parameter Table (top, 8 KByte)

25DH

A15:A8

02H

Section 5 Number of Sectors

Four of 8 KByte blocks (2n)

25EH

A23:A16

07H

Section 5 Block Protection Bit Start

((2m) +1)+ c, c=07H or 7, m= 4 for 8 Mb

Address bits are Read Lock bit locations and Even Address bits are

Write Lock bit locations. The most significant (left-most) bit indicates

the sign of the integer; it is sometimes called the sign bit. If the sign bit

is zero, then the number is greater than or equal to zero, or positive. If

the sign bit is one then the number is less than zero or negative.

25FH

A31:A24

0EH

Section 5 (Top) Block Protection Bit End

(((2m) +1)+ c, c=0EH or 15, m= 4 for 8 Mb,

Address bits are Read Lock bit locations and Even Address bits are

Write Lock bit locations. The most significant (left-most) bit indicates

the sign of the integer; it is sometimes called the sign bit. If the sign bit

is zero, then the number is greater than or equal to zero, or positive. If

the sign bit is one then the number is less than zero or negative.

1. See “Mapping Guidance Details” for more detailed mapping information

TABLE 11-2:

SERIAL FLASH DISCOVERABLE PARAMETER (SFDP) SST26WF080B/080BA

(CONTINUED) (16 OF 16)

Address

Bit Address

Data

Comments

TABLE 11-3:

SECTION DEFINITION

Major Section X

Section X: Sector Type Number

Section X: Number of Sectors

Section X: Block-Protection Register Bit Start Location

Section X: Block-Protection Register Bit End Location

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