week9 - Registers Storage unit in computers. An n-bit...

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Unformatted text preview: Registers Storage unit in computers. An n-bit register can hold an n-bit value Composed of a group of n flip-flops Each flip-flop stores 1 bit of information Normally use D flip-flops D Q Dff clk D Q Dff clk D Q Dff clk D Q Dff clk Controlled Register Reset Load Action Q = old Q 1 Q = 0 1 Q = D D Q Dff clk D Q Dff clk D Q Dff clk D Q Dff clk Shift Register Register that shifts the binary values in one or both directions D Q Dff clk D Q Dff clk D Q Dff clk D Q Dff clk In Out Clock Shift Register w/Parallel Load Shift Load Action 0 0 Q = old Q 1 X Shift 0 1 Parallel Load D Q Dff clk D Q Dff clk D Q Dff clk D Q Dff clk Bidirectional Shift Register w/Parallel Load S1 S0 Action 0 0 Q = old Q 0 1 Shift Down (V/2) 1 0 Shift Up (V*2) 1 1 Parallel Load D Q Dff clk D Q Dff clk D Q Dff clk D Q Dff clk Transfer of Data 2 modes of communication: Parallel vs. Serial Parallel: all bits transferred at the same time Serial: one bit transferred at a time Shift register can be used for serial data transfer SRG 4 SI SO SRG 4 SI SO Parallel Data Transfer...
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This note was uploaded on 04/07/2008 for the course EECS 203 taught by Professor Wu during the Winter '08 term at Northwestern.

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week9 - Registers Storage unit in computers. An n-bit...

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