METHOD FOR OPERATING PROGRAMMABLE LOGIC DEVICE

摘要

In a multi-context PLD (dynamically reconfigurable circuit), at the tune of rewriting configuration data on a non-selected context during circuit operation, configuration data is stably stored. At the time of rewriting configuration data on a non-selected context, writing to a row which is to be rewritten continues until input signals supplied to input terminals of routing switches in the row become “L” all that time or the input signals become “L” at least once. More specifically, a write selection signal for the row continues to be output. In addition, while the write selection signal is being output, loading of configuration data into a driver circuit is not conducted, or loading of configuration data into a driver circuit is conducted but storage thereof in a line buffer is not conducted.

主权项

1. A method for operating a programmable logic device,
wherein the programmable logic device comprises a first signal line, a second signal line, and a programmable switch, wherein the programmable switch comprises a first transistor and a second transistor, wherein one of a source and a drain of the first transistor is electrically connected to a gate of the second transistor, wherein a channel formation region of the first transistor comprises an oxide semiconductor, wherein the second signal line is electrically connected to one of a source and a drain of the second transistor, and wherein the first signal line is electrically connected to a gate of the first transistor, the method comprising the step of:
keeping a signal for the first signal line at a high level until a signal for the second signal line becomes a low level at least once when a signal is input to the gate of the second transistor through the first transistor.