SST26VF016B-104VSLASHSN datasheet(82/84 Pages) MICROCHIP

82 / 84 page

SST26VF016B

DS20005262G-page 82

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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 for-

mula.

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 11-4: BPSL/BPEL EQUATION WITH ACTUAL CONSTANT ADDER DERIVED FROM THE

FORMULA (2M + 1) + (C)

Block Size

8 Mbit to 128 Mbit

Comments

8-Kbyte (Type 2) Bottom

BPSL = (2m + 1) + 0FFH

BPEL = (2m + 1) + 04H

0FFH = -1; 06H = 6

Odd address bits are Read Lock bit

locations and even address bits are

Write Lock bit locations.

32-Kbyte (Type3)

BPSL = BPEL= (2m + 1) + 0FDH

0FDH = -3

64-Kbyte (Type 4)

BPSL = 00H

BPEL = (2m + 1) + 0FCH

00H is Block Protection Register bit 0

location; 0FCH = -4

32-Kbyte (Type 3)

BPSL = BPEL= (2m + 1) + 0FEH

0FEH = -2

8-Kbyte (Type 2) Top

BPSL = (2m + 1) + 07H

BPEL = (2m + 1) + 0EH

07H = 7; 0EH = 14

Odd address bits are Read Lock bit

locations and even address bits are

Write Lock bit locations.

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