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Tristate buffers can be used for shared bus interfaces, bidirectional IOs and shared memory interfaces. These onchip implementations allows bi-directional IO’s to switch polarities from input to output. Also when used on external chip-memory interface, these can switch to floating or high Z outputs to allow other devices on the same shared bus to access same memory.

On chip implementations using tristate buffer.

Tri-state buffer with ENA low is Switch open or Hi-Z, Truth Table and symbol from here: The implementation in truth table allows the output to go floating without attaining a high or low. This allows other devices connected on shared bus to drive the bus. Tristate buffer interface to memory shared bus is next.

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Solved Examples for 3 variable Kmaps
1. F(x,y,z) =     (0,1,6,7) - Minimization, on this page.
2. F(x,y,z) =     (0,1,4,5,6,7) - Minimization from here.
3. F(x,y,z) =     (3,4,6,7) - Minimization from here.
4. F(x,y,z) =     (0,1,2,3,4,5,6,7) - Minimization from here.

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How to implement a Integrated Clock Gating (ICG) cell from vendor library.

CMOS Digital Integrated Circuit design for VLSI.

Tri-state buffer with ENA low is switch open, Truth Table below:

ENA

IN

OUT

0

0

Z

0

1

Z

1

0

0

1

1

1

Verilog code for tristate buffer.

Tristate Inv.
Interview Questions. Main, FPGA, Digital basics
How to use tristate buffer on shared memory interfaces