SAM9G20 Atmel Corporation, SAM9G20 Datasheet - Page 343
SAM9G20
Manufacturer Part Number
SAM9G20
Description
Manufacturer
Atmel Corporation
Datasheets
1.SAM9261.pdf
(248 pages)
2.SAM9261.pdf
(1274 pages)
3.SAM9261.pdf
(43 pages)
4.SAM9G20.pdf
(42 pages)
5.SAM9G20.pdf
(832 pages)
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
- SAM9261 PDF datasheet
- SAM9261 PDF datasheet #2
- SAM9261 PDF datasheet #3
- SAM9G20 PDF datasheet #4
- SAM9G20 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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