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06 bus_structure_design

06 bus_structure_design - Bus Structure Design Example EE...

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Bus Structure: Design Example EE 2730 source: Brown and Vranesic (2008) 2 Figure 7.60. A digital system with k registers.

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source: Brown and Vranesic (2008) 3 Figure 7.61. Details for connecting registers to a bus. source: Brown and Vranesic (2008) 4 Figure 7.62. A shift-register control circuit..
source: Brown and Vranesic (2008) 5 Figure 7.63. A modified control circuit. source: Brown and Vranesic (2008) 6 module regn (R, Rin, Clock, Q); parameter n = 8; input [n-1:0] R; input Rin, Clock; output reg [n-1:0] Q; always @( posedge Clock) if (Rin) Q <= R; endmodule Figure 7.66. Code for an n -bit register of the type in Figure 7.61.

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source: Brown and Vranesic (2008) 7 module trin (Y, E, F); parameter n = 8; input [n-1:0] Y; input E; output wire [n-1:0] F; assign F = E ? Y : 'bz; endmodule Figure 7.67. Code for an n -bit tri-state module. source: Brown and Vranesic (2008) 8 module shiftr (Resetn, w, Clock, Q); parameter m = 4; input Resetn, w, Clock; output reg [1:m] Q; integer k; always @( negedge Resetn, posedge Clock) if (!Resetn) Q <= 0; else begin for (k = m; k > 1; k = k-1) Q[k] <= Q[k-1]; Q[1] <= w;
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