Command Mode Decoding Logic for Bus Management Unit
Nidhi Singh1, Devendra Singh2, Minakshi Sanadhya3

1Nidhi Singh, ECE Dept. SRM University.
2Devendra Singh, ME Dept. Sunderdeep college.
3Minakshi Sanadhya, ECE Dept. SRM University.

Manuscript received on July 01, 2012. | Revised Manuscript received on July 04, 2012. | Manuscript published on July 05, 2012. | PP: 419-415 | Volume-2, Issue-3, July 2012. | Retrieval Number: C0786062312/2012©BEIESP
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Abstract: Command Processing Logic is command execution in spacecraft. The commands and the clock extracted from incoming signal are sent to the command processing logic. The commands are transmitted with redundancy and with encoding. Each command is transmitted four times. To detect error in commands encoding is used. The command processing logic should take care of redundancy and also should extract the correct command bit from the incoming bit stream. Ones correct command is detected the command processing logic produce an authentic pulse. With the rising edge of the authentic pulse, the commands are stored in an auxiliary register. The command processing logic also contains the logic to produce pulse commands. Command Decoding Logic the command decoder extracts the command information, the message bits and stores it in auxiliary resister which can be read using CPU. The command decoder then checks for the command bits and produce the pulse commands

Keywords: VHDL, auxiliary register, command decoder, pulse commands, authentic pulse, BMU, command processing logic, Command Decoding Logic