Aviation Electronics Technician 1 - Historic Naval Ships Association

Figure 1-4.-Manchester encoding.through 6 are the decoded address bit, but it is not the a master clock pulse train. The clock pulse rate is 120same configuration as the encoded word. Bit 7 is the tagbit and is always 1 in the decoded word. Bit 8 is the enterbit and is always 0 for the decoded words.The ICCG components process binary commandand status words that cause changes in operation anddisplay configuration. Word exchanges betweencomponents are done by binary word data encoded inManchester format.Manchester Word EncodingThe Manchester word format is a modification ofthe 36-bit encoded word generated in the components.This is done for transmission of the information fromone component to another. The modification isaccomplished by combining the basic 36-bit word withkHz, and the pulse width is 8.3 microseconds.Figure 1-4 shows a Manchester encoder equivalentcircuit and its input and output signals. When both inputsto the first AND gate are 1, the Manchester word bit isalso 1 for the 4.15-microsecond duration of the positiveclock pulse. The resulting Manchester pulse occursduring the first half of the bit period. The output pulseof the first AND gate is applied to both the inverter inputand the Manchester word output. The inverter producesa 0 output to keep the output of the second AND gate at0, while a Manchester pulse is being produced. Sincethe clock pulse is negative during the second half of thebit period, the output of the second AND gate remainsat 0.When the basic binary word bit at the first AND gateis 0 and the clock pulse is 1, the output of the first ANDgate is 0. This causes the output of the inverter to be 1.1-6