at91sam9260-cj ATMEL Corporation, at91sam9260-cj Datasheet - Page 231
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at91sam9260-cj
Manufacturer Part Number
at91sam9260-cj
Description
At91 Arm Thumb Microcontrollers
Manufacturer
ATMEL Corporation
Datasheet
1.AT91SAM9260-CJ.pdf
(790 pages)
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Figure 23-2. Parity Generation for 512/1024/2048/4096 8-bit Words1
6221G–ATARM–31-Jan-08
(page size -1 )th byte
(page size -2 )th byte
(page size -3 )th byte
Page size th byte
Page size = 512 Px = 2048
Page size = 1024 Px = 4096
Page size = 2048 Px = 8192
Page size = 4096 Px = 16384
4 th byte
2nd byte
3rd byte
1st byte
To calculate P8’ to PX’ and P8 to PX, apply the algorithm that follows.
Bit7
Bit7
Bit7
Bit7
Bit7
Bit7
Bit7
Bit7
P1
Page size = 2
P2
for i =0 to n
begin
end
Bit6
Bit6
Bit6
Bit6
Bit6
Bit6
Bit6
Bit6
for (j = 0 to page_size_byte)
begin
P1'
if(j[i] ==1)
else
end
P[2
P[2
P4
i+3
i+3
Bit5
Bit5
Bit5
Bit5
Bit5
Bit5
Bit5
Bit5
P1
]=bit7(+)bit6(+)bit5(+)bit4(+)bit3(+)
]’=bit7(+)bit6(+)bit5(+)bit4(+)bit3(+)
P2'
n
Bit4
Bit4
Bit4
Bit4
Bit4
Bit4
Bit4
Bit4
P1'
bit2(+)bit1(+)bit0(+)P[2
bit2(+)bit1(+)bit0(+)P[2
Bit3
Bit3
Bit3
Bit3
Bit3
Bit3
Bit3
Bit3
P1
P2
P1=bit7(+)bit5(+)bit3(+)bit1(+)P1
P2=bit7(+)bit6(+)bit3(+)bit2(+)P2
P4=bit7(+)bit6(+)bit5(+)bit4(+)P4
P1'=bit6(+)bit4(+)bit2(+)bit0(+)P1'
P2'=bit5(+)bit4(+)bit1(+)bit0(+)P2'
P4'=bit7(+)bit6(+)bit5(+)bit4(+)P4'
Bit2
Bit2
Bit2
Bit2
Bit2
Bit2
Bit2
Bit2
P1'
P4'
Bit1
Bit1
Bit1
Bit1
Bit1
Bit1
Bit1
Bit1
P1
P2'
Bit0
Bit0
Bit0
Bit0
Bit0
Bit0
Bit0
Bit0
P1'
i+3
i+3
]
P8
P8'
P8
P8'
P8
P8'
P8
P8'
]'
P16'
P16'
P16
P16
AT91SAM9260
P32
P32
P32
PX
PX'
231
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