SST26WF040BA datasheet(92/96 Pages) MICROCHIP

92 / 96 page

SST26WF040B/040BA SST26WF080B/080BA

DS20005283C-page 92

 2014-2017 Microchip Technology Inc.

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.

11.2

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. 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.

11.3

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.

11.4

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 “Memory Configuration”.

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.

11.5

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 “Mem-

ory Configuration”

11.6

Memory Configuration

For the SST26WF040B/040BA and SST26WF080B/

080BA family, the memory configuration 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 8KByte blocks, one 32KByte block,

x number of 64KByte blocks depending on memory

size, then one 32KByte block, and four 8KByte block on

the top of memory. See Table 11-4.

TABLE 11-4:

MEMORY BLOCK DIAGRAM REPRESENTATION

8 KByte Bottom Block

(from 000000H)

Section 1: Sector Type Number

Section 1: Number of Sectors

Section 1: Block-Protection Register Bit Start Location

Section 1: Block-Protection Register Bit End Location

32 KByte

Section 2: Sector Type Number

Section 2: Number of Sectors

Section 2: Block-Protection Register Bit Start Location

Section 2: Block-Protection Register Bit End Location

64 KByte

Section 3: Sector Type Number

Section 3: Number of Sectors

Section 3: Block-Protection Register Bit Start Location

Section 3: Block-Protection Register Bit End Location

32 KByte

Section 4: Sector Type Number

Section 4: Number of Sectors

Section 4: Block-Protection Register Bit Start Location

Section 4: Block-Protection Register Bit End Location

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