LOCAL ROUTING NETWORK WITH SELECTIVE FAST PATHS FOR PROGRAMMABLE LOGIC DEVICE

摘要

A routing network is associated with a logic island in a logic block of a programmable logic device and includes switches for each of feedback, street, and highway networks. Some of the switches include multiple stages. The street network switch receives the signals from the feedback network switch, signals from neighboring highway network switches, and direct feedback from selected logic island outputs and provides outputs to the logic island. The street network switch includes multiple stages, where outputs to the logic island are provided directly by each stage in the street network switch. The output terminals of a first stage of the street network switch that are connected to the logic island are also connected to the second stage of the street network switch. The second stage of the street network switch receives feedback output signals from the feedback network and directly from the associated logic island.

主权项

1. A programmable logic device comprising:
a plurality of logic blocks and an interconnecting network; wherein each logic block in the plurality of logic blocks comprises a logic island and a routing network associated with the logic island, wherein the routing network comprises: a network switch comprising a first stage of switch boxes and a second stage of switch boxes, wherein a first portion of output terminals of the first stage of switch boxes is connected directly to the logic island and is connected directly to a first set of input terminals of the second stage of switch boxes, and a second portion of output terminals of the first stage of switch boxes is connected to a second set of input terminals of the second stage of switch boxes.