深圳市深信泰丰(集团)股份有限公司

1、5.7 MultiplexersReturnNext Multiplexers(mux) A multiplexer is a digital switch it connects data from one of n sources to its output.D0D1DnYSELEN.1D01D11Dn1YSELEN.2D02D12Dn2Y.3D03D13Dn3Y. An n-input, b-bit multiplexer, its output isMj represents miniterm j of the s select inputs.15.7 MultiplexersNext

2、BackReturn Standard MSI Multiplexers 74x151EN ABC YD0D1 YD2D3D4D5D6D774X151547111093211561413120 1D0 D0D1 D1D2 D2D3 D3D4 D4D5 D5D6 D6D7 D71 x x x0 0 0 00 0 0 10 0 1 00 0 1 10 1 0 00 1 0 10 1 1 00 1 1 1Y YEN C B AOutputsInputs25.7 MultiplexersNextBackReturn0 0 0 01A 2A 3A 4A1B 2B 3B 4B1 x0 0 0 11Y 2Y

3、 3Y 4YG SOutputsInputsG S1A1B 1Y2A 2Y2B 3Y3A 4Y3B4A4B74X15745151236111014913712 74x15735.7 MultiplexersNextBackReturn 74x153A B1G1C0 1Y1C11C2 2Y1C32G2C02C12C22C374X153751421643151091112131C0 2C01C1 2C11C2 2C21C3 2C3 1C0 0 1C1 0 1C2 0 1C3 0 0 2C0 0 2C1 0 2C2 0 2C3 0 00 0 0 00 0 0 10 0 1 00 0 1 10 1 0

4、 00 1 0 10 1 1 00 1 1 11 0 0 01 0 0 11 0 1 01 0 1 11 1 X X1Y 2Y1G 2G B AOutputsInputs45.7 Multiplexers Expanding Multiplexers (P403 Figure 5-66) Multiplexers, Demultiplexers, and Buses A multiplexer can be used to select one of n sources of data to transmit on a bus. At the far end of the bus, a demultiplexer can be used to route the bus data to one of m destinations. (P404 figure 5-67) A binary decoder with an enable input ca