AT32UC3A4256 Atmel Corporation, AT32UC3A4256 Datasheet - Page 251
AT32UC3A4256
Manufacturer Part Number
AT32UC3A4256
Description
Manufacturer
Atmel Corporation
Datasheets
1.AT32UC3A0128.pdf
(377 pages)
2.AT32UC3A0128.pdf
(33 pages)
3.AT32UC3A0128.pdf
(159 pages)
4.AT32UC3A3128.pdf
(91 pages)
5.AT32UC3A3128.pdf
(1012 pages)
Specifications of AT32UC3A4256
Flash (kbytes)
256 Kbytes
Pin Count
100
Max. Operating Frequency
66 MHz
Cpu
32-bit AVR
Hardware Qtouch Acquisition
No
Usb Transceiver
1
Usb Speed
Hi-Speed
Usb Interface
Device + OTG
Spi
6
Twi (i2c)
2
Uart
4
Ssc
1
Sd / Emmc
2
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
128
Self Program Memory
YES
Dram Memory
No
Nand Interface
Yes
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
3.0 to 3.6
Operating Voltage (vcc)
3.0 to 3.6
Fpu
No
Mpu / Mmu
Yes / No
Timers
6
Output Compare Channels
6
Input Capture Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AT32UC3A4256S-C1UR
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Company:
Part Number:
AT32UC3A4256S-U
Manufacturer:
ST
Quantity:
79
Part Number:
AT32UC3A4256S-U
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
- AT32UC3A0128 PDF datasheet
- AT32UC3A0128 PDF datasheet #2
- AT32UC3A0128 PDF datasheet #3
- AT32UC3A3128 PDF datasheet #4
- AT32UC3A3128 PDF datasheet #5
- Current page: 251 of 1012
- Download datasheet (16Mb)
AT32UC3A3/A4
For ECC-RS, in order to perform 4-error correction per 512 bytes of 8-bit words, the codeword
have to be generated by the RS4 Encoder module and stored into the NAND Flash extra area,
according to the scheme shown in
Figure 17-5 on page 251
Figure 17-5. RS Codeword Generation
Feedback
α
α
α
α
α
α
α
α
395
28
603
383
539
500
397
402
+
DataIn
+
+
+
+
+
+
+
CW7
CW6
CW5
CW4
CW3
CW2
CW1
CW0
In read mode, firstly, the detection for any error is done with the partial syndrome module. It is
the responsibility of the ECC-RS Controller to determine after receiving the old codeword stored
in the extra area if there is any error on data and /or on the old codeword. If all syndromes (Si)
are equal to zero, there is no error, otherwise a polynomial representation is written into
CWPS00 to CWPS79 registers. The Partial Syndrome module performs an algorithm according
to the scheme in
Figure 17-6 on page 251
Figure 17-6. Partial Syndrome Block Diagram
S7
Mult α
i
x
S2
x
S1
x
RegOct
S0
DataIn(x)
If the Correction Enable bit is set in the ECC Mode Register (MD.CORRS4) then the polynomial
representation of error are sent to the polynomial processor. The aim of this module is to per-
form the polynomial division in order to calculate two polynomials, Omega (Z) and Lambda (Z),
which are necessary for the two following modules (Chien Search and Error Evaluator). In order
to perform addition, multiplication, and division a Read Only Memory (ROM) has been added
containing the 1024 elements of the Galois field. Both Chien Search and Error Evaluator work in
parallel. The Error Evaluator has the responsibility to determine the Nth error value in the data
and in the old codeword according to the scheme in
Figure 17-7 on page 252
251
32072G–11/2011
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