SAM9G15 Atmel Corporation, SAM9G15 Datasheet - Page 343
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SAM9G15
Manufacturer Part Number
SAM9G15
Description
Manufacturer
Atmel Corporation
Datasheets
1.SAM9261.pdf
(248 pages)
2.SAM9261.pdf
(1274 pages)
3.SAM9261.pdf
(43 pages)
4.SAM9G15.pdf
(1211 pages)
5.SAM9G15.pdf
(45 pages)
Specifications of SAM9G15
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
6
Lin
4
Ssc
1
Sd / Emmc
2
Graphic Lcd
Yes
Video Decoder
No
Camera Interface
No
Adc Channels
12
Adc Resolution (bits)
10
Adc Speed (ksps)
440
Resistive Touch Screen
Yes
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
32
Self Program Memory
NO
External Bus Interface
1
Dram Memory
DDR2/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
- SAM9261 PDF datasheet
- SAM9261 PDF datasheet #2
- SAM9261 PDF datasheet #3
- SAM9G15 PDF datasheet #4
- SAM9G15 PDF datasheet #5
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- Download datasheet (30Mb)
27.5
27.5.1
27.5.2
11053B–ATARM–22-Sep-11
11053B–ATARM–22-Sep-11
Software Implementation
Remainder Substitution Procedure
Find the Error Location Polynomial Sigma(x)
The substitute function evaluates the polynomial remainder, with different values of the field
primitive elements. The finite field arithmetic addition operation is performed with the Exclusive
or. The finite field arithmetic multiplication operation is performed through the gf_log, gf_antilog
lookup tables.
The REM2NP1 and REMN2NP3 fields of the PMECC_REMx registers contain only odd remain-
ders. Each bit indicates whether the coefficient of the polynomial remainder is set to zero or not.
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.
si[] is a table that holds the current syndrome value, an element of that table belongs to the field.
This is also a shared variable for the next step of the decoding operation.
oo[] is a table that contains the degree of the remainders.
The sample code below gives a Berlekamp iterative procedure for finding the value of the error
location polynomial.
The input of the procedure is the si[] table defined in the remainder substitution procedure.
int substitute()
{
int i;
int j;
for (i = 1; i < 2 * NB_ERROR_MAX; i++)
{
}
for (i = 1; i < 2*NB_ERROR; i++)
{
}
return 0;
}
si[i] = 0;
for (j = 0; j < oo[i]; j++)
{
}
if (REM2NPX[i][j])
{
}
si[i] = gf_antilog[(i * j)%NB_FIELD_ELEMENTS] ^ si[i];
SAM9G35
SAM9G35
343
343
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