SST26VF064BEUI datasheet(74/81 Pages) MICROCHIP

74 / 81 page

 2015-2018 Microchip Technology Inc.

DS20006138A-page 74

SST26VF064BEUI

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.

12.1.1

SECTOR TYPE NUMBER

Sector Type Number is the sector/block size typed

defined in JEDEC Flash Parameter Table: SFDP

address locations 4CH, 4EH, 50H, and 52H. For SFDP

address location 4CH, which is Sector Type 1, the size

is represented by 01H; SFDP address location 4EH,

Sector Type 2, size is represented by 02H; SFDP

address location 50H, Sector Type 3, size is repre-

sented by 03H; and SFDP address location 52H, Sec-

tor Type 4, size is represented by 04H. 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.

12.1.2

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.

TABLE 12-2:

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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