Connected between routing arrays between neurons and synapses, routing vectors allow neurons and synapses to be attached to routing channels. Effectively each input or output of a neuron or synapse cell can be connected to any of the channels through these routing vectors.

Programmable connections are used as vias between the channel and the cell input/output.

Programmable Connection	Programmable Wire

The initial layout used for routing vectors was slightly different in an attempt to conserve space. Only one row of programmable connections was used in this design, with programmable wires at the end. This would allow either the output of one cell or the input of another cell to be used at each of the four sides of the routing array. This was a significant disadvantage in terms of routability, and was found to not conserve space. Most of the space in this area between cells was simply used for routing wires. Much free space was available for the additional row of programmable connections.

Original planned routing layout

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