SST26VF032B-104ISLASHSM datasheet(75/82 Pages) MICROCHIP

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DS20005218K-page 75

SST26VF032B/SST26VF032BA

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 4-Kbyte

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.

11.1.3

BLOCK PROTECTION REGISTER

BIT START LOCATION (BPSL)

Block Protection Register Bit Start Location (BPSL)

designates the start bit location in the Block Protection

tion begins. If the value of BPSL is 00H, this location is

the 0 bit location. If the value is other than 0, then this

value is a constant value adder (c) for a given formula,

(2m + 1) + (c). See Section 11.1.5 “Memory Con-

figuration”.

From the initial location, there will be a bit location for

every increment by 1 until it reaches the Block Protec-

tion Register Bit End Location (BPEL). This number

range from BPSL to BPEL will correspond to, and be

equal to, the number of sectors/blocks on this Major

Section.

11.1.4

BLOCK PROTECTION REGISTER

BIT END LOCATION (BPEL)

Block Protection Register Bit End Location designates

the end bit location in the Block Protection Register bit

where the last sector/block of this Major Section ends.

The value in this field is a constant value adder (c) for

a given formula or equation, (2m + 1) + (c). See

Section 11.1.5 “Memory Configuration”

11.1.5

MEMORY CONFIGURATION

For the SST26VF032B/032BA family, the memory con-

figuration is setup with different contiguous block sizes

from bottom to the top of the memory. For example,

starting from bottom of memory it has four 8-Kbyte

blocks, one 32-Kbyte block, x number of 64-Kbyte

blocks depending on memory size, then one 32-Kbyte

block, and four 8-Kbyte block on the top of memory.

See Table 11-3.

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