SAM9G20 Atmel Corporation, SAM9G20 Datasheet - Page 225

• Manufacturer Part Number: SAM9G20
• Manufacturer: Atmel Corporation

Specifications of SAM9G20

• Flash (kbytes): 0 Kbytes
• Pin Count: 217
• Max. Operating Frequency: 400 MHz
• Cpu: ARM926
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 96
• Ext Interrupts: 96
• Usb Transceiver: 3
• Usb Speed: Full Speed
• Usb Interface: Host, Device
• Spi: 2
• Twi (i2c): 1
• Uart: 7
• Ssc: 1
• Ethernet: 1
• Sd / Emmc: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: Yes
• Adc Channels: 4
• Adc Resolution (bits): 10
• Adc Speed (ksps): 95
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 32
• Self Program Memory: NO
• External Bus Interface: 1
• Dram Memory: sdram
• Nand Interface: Yes
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8/3.3
• Operating Voltage (vcc): 0.9 to 1.1
• Fpu: No
• Mpu / Mmu: No/Yes
• Timers: 6
• Output Compare Channels: 6
• Input Capture Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

Figure 23-2. Parity Generation for 512/1024/2048/4096 8-bit Words
6384E–ATARM–05-Feb-10
(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
ECC Status Registers, ECC Parity Registers are cleared when a read/write command is
detected or a software reset is performed.
For Single-bit Error Correction and Double-bit Error Detection (SEC-DED) hsiao code is used.
24-bit ECC is generated in order to perform one bit correction per 256 or 512 bytes for pages of
512/2048/4096 8-bit words. 32-bit ECC is generated in order to perform one bit correction per
512/1024/2048/4096 8- or 16-bit words.They are generated according to the schemes shown in
Figure 23-2
To calculate P8’ to PX’ and P8 to PX, apply the algorithm that follows.
• ECC error: The ECCERR flag in the ECC Status Registers (ECC_SR1/ECC_SR2) are set.
• Non correctable error: The MULERR flag in the ECC Status Registers
Bit7
Bit7
Bit7
Bit7
Bit7
Bit7
Bit7
Bit7
An error has been detected in the ECC code stored in the Flash memory. The position of the
corrupted bit can be found by the application performing an XOR between the Parity and the
NParity contained in the ECC code stored in the Flash memory.
(ECC_SR1/ECC_SR2) are set. Several unrecoverable errors have been detected in the
Flash memory page.
P1
Page size = 2
P2
for i =0 to n
Bit6
Bit6
Bit6
Bit6
Bit6
Bit6
Bit6
Bit6
P1'
and
P4
Bit5
Bit5
Bit5
Bit5
Bit5
Bit5
Bit5
Bit5
P1
Figure
P2'
n
Bit4
Bit4
Bit4
Bit4
Bit4
Bit4
Bit4
Bit4
P1'
23-3.
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'
P8
P8'
P8
P8'
P8
P8'
P8
P8'
P16'
P16'
P16
P16
AT91SAM9G20
P32
P32
P32
PX
PX'
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