SST26VF032BEUI datasheet(70/76 Pages) MICROCHIP

70 / 76 page

SST26VF032BEUI

DS20006152A-page 70

 2019 Microchip Technology Inc.

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 “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.

11.1.4

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 “Mem-

ory Configuration”

11.1.5

MEMORY CONFIGURATION

For the SST26VF032BEUI family, the memory configu-

ration 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 11-3.

Classifying these sector/block sizes via the Sector

Type derived from JEDEC Flash Parameter Table:

SFDP address locations 4EH, 50H, and 52H are as fol-

lows:

• 8KByte Blocks are classified as Sector Type 2

(@4EH of SFDP)

• 32KByte Blocks are classified as Sector Type 3

(@50H of SFDP)

• 64KByte Blocks are classified as Sector Type 4

(@52H of SFDP)

For the Number of Sectors associated with the contig-

uous sectors/blocks, a formula is used to determine the

number of sectors/blocks of these Sector Types:

• 8KByte Block (Type 2) is calculated by 2n. n is a byte.

• 32KByte Block (Type 3) is calculated by 2n. n is a byte.

• 64KByte Block (Type 4) is calculated by (2m - 2). m

can either be a 4, 5, 6, 7 or 8 depending on the mem-

ory size. This m field is going to be used for the

64KByte Block Section and will also be used for the

Block Protection Register Bit Location formula.

TABLE 11-3:

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

8 KByte (Top Block)

Section 5: Sector Type Number

Section 5: Number of Sectors

Section 5: Block-Protection Register Bit Start Location

Section 5: Block-Protection Register Bit End Location

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