Patent ID: 7136379

Claim:
An apparatus, comprising: first, second, and third interfaces each having an input and an output; an interface controller having a first, second, and third control outputs, and operable to enable any one of said outputs individually; a first, second, third, fourth, fifth, and sixth buffers, each of the buffers having an input, an output, and a single control input, and wherein said single control inputs enable and disable the coupling of signals through said buffers, and wherein said output of said first and second buffers are coupled to said input of said first interface; said outputs of said third and fourth buffers are coupled to said input of said second interface; said outputs of said fifth and sixth buffers are coupled to said input of said third interface; said output of said first interface is coupled to said inputs of said fourth and fifth buffers; said output of said second interface is coupled to said inputs of said first and sixth buffers; said output of said third interface is coupled to said inputs of said second and third buffers; said first control output is coupled to both of said single control inputs of said first and fourth buffers to selectively enable bi-directional interconnection of the first interface and second interface; said second control output is coupled to both of said single control inputs of said third and sixth buffers to selectively enable bi-directional interconnection of the second interface and third interface, and said third control output is coupled to both of said single control inputs of said second and fifth buffers to selectively enable bi-directional interconnection of the first interface and third interface.