SST26WF016BA datasheet(72/75 Pages) MICROCHIP

72 / 75 page

SST26WF016B/SST26WF016BA

DS20005013D-page 72

 2014 Microchip Technology Inc.

• 8Mbit = 4

• 16Mbit = 5

• 32Mbit = 6

• 64Mbit = 7

• 128Mbit = 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 8Mbit to 128Mbit (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) + FFH

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) + FCH

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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