Friday, June 25, 2010
My last day in Sony
Tuesday, June 22, 2010
My 1st C# program DONE
Monday, June 7, 2010
Designing the 1st C# program
Friday, June 4, 2010
troubleshooting on the HDMI port
today i starting to learn about something technical to the electronic subject. I starting to learn the procedure to troubleshot the HDMI port. First of all I understand the concept on how to doing the HDMI port troubleshooting, then I try do the flow chart for the procedure. Above is my flow chart.
Saturday, May 29, 2010
after 1 week, my CRC check function finally done
Friday, May 21, 2010
CRC calculation part1
Monday, May 10, 2010
crc learning
Computation of CRC
To compute an n-bit binary CRC, line the bits representing the input in a row, and position the (n+1)-bit pattern representing the CRC's divisor (called a "polynomial") underneath the left-hand end of the row. Here is the first calculation for computing a 3-bit CRC:
11010011101100 <--- input 1011 <--- divisor (4 bits) -------------- 01100011101100 <--- result
If the input bit above the leftmost divisor bit is 0, do nothing and move the divisor to the right by one bit. If the input bit above the leftmost divisor bit is 1, the divisor is exclusive-ORed into the input (in other words, the input bit above each 1-bit in the divisor is toggled). The divisor is then shifted one bit to the right, and the process is repeated until the divisor reaches the right-hand end of the input row. Here is the last calculation:
00000000001110 <--- result of previous step 1011 <--- divisor -------------- 00000000000101 <--- remainder (3 bits)
Since the leftmost divisor bit zeroed every input bit it touched, when this process ends the only bits in the input row that can be nonzero are the n bits at the right-hand end of the row. These n bits are the remainder of the division step, and will also be the value of the CRC function (unless the chosen CRC specification calls for some postprocessing).
after we calculate the crc value we have to added them to each byte of sending value before the transmitting process. up to this point, we can send the data and we will checking our correctness of data at the receiver side.if the crc value in the receiver and transmitter is same then the information is say to be sending successfully. otherwise we have to resend the information and check again at the receiver.