SST26VF032B datasheet(73/77 Pages) MICROCHIP

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 2013-2016 Microchip Technology Inc.

DS20005218E-page 73

SST26VF032B / SST26VF032BA

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

you dissect across memory from 000000h to the full

range. Similar sector/block size that re-appear may be

defined as a different Major Section.

11.1.1

SECTOR TYPE NUMBER

Sector Type Number is the sector/block size type

defined in JEDEC Flash Parameter Table: SFDP

address locations 4CH, 4EH, 50H, and 52H. Sector

Type 1, which is represented by 01H, is located at

address 4CH. Sector Type 2, which is represented by

02H, is located at address location 4EH. Sector Type 3,

which is represented by 03H, is located at address

location 50H. Sector Type 4, represented by 04H, is

located at address location 52H. Contiguous Same

Sector Type # Size can re-emerge across the memory

range and this Sector Type # will indicate that it is a

separate/independent Major Section from the previous

contiguous sectors/blocks.

11.1.2

NUMBER OF SECTORS

Number of Sectors represents the number of contigu-

ous sectors/blocks with similar size. A formula calcu-

lates the contiguous sectors/blocks with similar size.

Given the sector/block size, type, and the number of

sectors, the address range of these sectors/blocks can

be determined along with specific Block Locking Reg-

ister bits that control the read/write protection of each

sectors/blocks.

25EH

A23:A16

07H

Section 5 Block Protection Bit Start

((2m) +1)+ c, c=07H or 7, m= 6 for 32 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 14, m= 6 for 32 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 11-1:

SERIAL FLASH DISCOVERABLE PARAMETER (SFDP) (CONTINUED) (16 OF 16)

Address

Bit Address

Data

Comments

TABLE 11-2:

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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