ect114 Essay

1524 WordsOct 30, 20137 Pages
RAW: _______ /63 pts 1. Explain the operation of an encoder. (1 point) Encoding is used to generate a coded output (such as BCD or binary) from a singular active numeric input line. 2. What does it mean when an encoder is a priority encoder? (1 point) A priority encoder is when two or more inputs are active simultaneously, and the input with the highest priority is represented on the output, with input line I7 having the highest priority. 3. Describe one practical application that uses encoder. (1 point) An encoder is used in most wireless devices such as garage door openers to help filter out interference from other devices. 4. Explain the operation of a decoder. (1 point) Decoding is the process of converting some code (Such…show more content…
Off corresponds to a logic low. (10 points) INPUTS OUTPUTS 7N 6N 5N 4N 3N 2N 1N 0N EIN GSN EON A2N A1N A0N X X X X X X X X H H H H H H H H H H H H H H L H L H H H H H H H H H H L L L H H H H H H H H H H L H L L H H H L H H H H H L H H L L H H L H H H H H L H H H L L H H L L H H H L H H H H L L H L H H H H L H H H H H L L H L H L H L H H H H H H L L H L L H L H H H H H H H L L H L L L 12. Compare the results of your table from the eSOC encoder to that of the data sheet and identify what line(s) are incorrect. (5 points) It seems that the encoder was programmed strangely and got a lot of various lines incorrect in different places. 13. Find a truth table for the 74138 decoder. You can use the one in your textbook or download a datasheet from a manufacturer. Use the datasheet to fill in the Output columns in the table below. Depending on the source of your datasheet, you may need to cross reference the pin names. (5 points) INPUTS OUTPUTS G1 G2AN G2BN C B A Y0N Y1N Y2N Y3N Y4N Y5N Y6N Y7N X H X X X X H H H H H H H H X X H X X X H H H H H H H H L X X X X X H H H H H H H H H L L L L L L H H H H H H H H L L L L H H L H H H H H H