SAM9X25 Atmel Corporation, SAM9X25 Datasheet - Page 354

• Manufacturer Part Number: SAM9X25
• Manufacturer: Atmel Corporation

Specifications of SAM9X25

• Flash (kbytes): 0 Kbytes
• Pin Count: 217
• Max. Operating Frequency: 400 MHz
• Cpu: ARM926
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 105
• Ext Interrupts: 105
• Usb Transceiver: 3
• Usb Speed: Hi-Speed
• Usb Interface: Host, Device
• Spi: 2
• Twi (i2c): 3
• Uart: 7
• Can: 2
• Lin: 4
• Ssc: 1
• Ethernet: 2
• Sd / Emmc: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 12
• Adc Resolution (bits): 10
• Adc Speed (ksps): 440
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 32
• Self Program Memory: NO
• External Bus Interface: 1
• Dram Memory: DDR/LPDDR, SDRAM/LPSDR
• 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
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: No

354
SAM9X25
The output of the procedure is the error location polynomial named smu (sigma mu). The poly-
nomial coefficients belong to the field. The smu[NB_ERROR+1][] is a table that contains all
these coefficients.
NB_ERROR_MAX defines the maximum value of the error correcting capability.
NB_ERROR defines the error correcting capability selected at encoding/decoding time.
NB_FIELD_ELEMENTS defines the number of elements in the field.
int get_sigma()
{
int i;
int j;
int k;
/* mu
int mu[NB_ERROR_MAX+2];
/* sigma ro
int sro[2*NB_ERROR_MAX+1];
/* discrepancy */
int dmu[NB_ERROR_MAX+2];
/* delta order
int delta[NB_ERROR_MAX+2];
/* index of largest delta */
int ro;
int largest;
int diff;
/*
/*
/*
/* Mu */
mu[0]
/* Sigma(x) set to 1 */
for (i = 0; i < (2*NB_ERROR_MAX+1); i++)
smu[0][0] = 1;
/* discrepancy set to 1 */
dmu[0] = 1;
/* polynom order set to 0 */
lmu[0] = 0;
/* delta set to -1 */
delta[0]
/*
/*
/*
/* Mu */
mu[1]
/* Sigma(x) set to 1 */
for (i = 0; i < (2*NB_ERROR_MAX+1); i++)
smu[0][i] = 0;
First Row
= -1; /* Actually -1/2 */
Second Row
= 0;
= (mu[0] * 2 - lmu[0]) >> 1;
*/
*/
*/
*/
*/
*/
*/
*/
*/
11054A–ATARM–27-Jul-11