SST26VF032BEUI datasheet(71/76 Pages) MICROCHIP

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DS20006152A-page 71

SST26VF032BEUI

m will have a constant value for specific densities and

is defined as:

• 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 con-

stant value that represents the different densities from

8Mbit to 128Mbit (used also in the formula calculating

number of 64Kbyte 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 for-

mula 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 for-

mula. The most significant (left most) bit indicates 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 (Type 3)

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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