SST26VF032B datasheet(76/82 Pages) MICROCHIP

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SST26VF032B/SST26VF032BA

DS20005218K-page 76

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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:

• 8-Kbyte Blocks are classified as Sector Type 2

(@4EH of SFDP)

• 32-Kbyte Blocks are classified as Sector Type 3

(@50H of SFDP)

• 64-Kbyte 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:

• 8-Kbyte Block (Type 2) is calculated by 2n. n is a

byte.

• 32-Kbyte Block (Type 3) is calculated by 2n. n is a

byte.

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

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

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

64-Kbyte Block Section and will also be used for the

Block Protection Register Bit Location formula.

m will have a constant value for specific densities and is

defined as:

•8 Mbit = 4

•16 Mbit = 5

• 32 Mbit = 6

• 64 Mbit = 7

•128 Mbit = 8

Block Protect Register Start/End Bits are mapped in the

SFDP by using the formula (2m + 1) + (c). m is a

constant value that represents the different densities

from 8 Mbit to 128 Mbit (used also in the formula calcu-

lating number of 64-Kbyte Blocks above). The values

that are going to be placed in the Block Protection Bit

Start/End field table are the constant value adder (c)

in the formula and are represented in two’s compliment

except when the value is 00H. If the value is 00H, this

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

then this is a constant value adder (c) that will be used

in the formula. The most significant (left most) bit indi-

cates 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.

See Table 11-4 for an example of this 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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