Abstract: Configurable time-borrowing flip-flops may be based on configurable pulse generation circuitry and pulse latches. The circuitry may use a self-timed architecture that controls the width of clock pulses that are generated so that the pulse latches that are controlled by the clock pulses exhibit a reduced risk of race through conditions. Latch circuitry may be provided that is based on a pulse latch and an additional latch connected in series with the pulse latch. In situations in which there is a potential for race through conditions on an integrated circuit, the additional latch may be switched into use to convert the latch circuitry into an edge-triggered flip flop. Clock trees may be provide with configurable shorting structures that help to reduce clock skew. Low-contention clock drivers may drive signals onto the clock tree paths.

Abstract: Configurable time-borrowing flip-flops may be based on configurable pulse generation circuitry and pulse latches. The circuitry may use a self-timed architecture that controls the width of clock pulses that are generated so that the pulse latches that are controlled by the clock pulses exhibit a reduced risk of race through conditions. Latch circuitry may be provided that is based on a pulse latch and an additional latch connected in series with the pulse latch. In situations in which there is a potential for race through conditions on an integrated circuit, the additional latch may be switched into use to convert the latch circuitry into an edge-triggered flip flop. Clock trees may be provide with configurable shorting structures that help to reduce clock skew. Low-contention clock drivers may drive signals onto the clock tree paths.

Abstract: Configurable adder circuitry is provided on an integrated circuit that includes redundant circuitry. The integrated circuit may contain nonvolatile memory and logic circuitry that produces a redundancy control signal. During manufacturing, the integrated circuitry may be tested. If a defect is identified on the integrated circuit, the redundancy control signal may be used in switching redundant circuitry into place bypassing the defect. The integrated circuit may contain an array of logic regions. Each logic region may contain adders and multiplexer circuitry for selectively combining the multiplexers to form larger adders. The multiplexer circuitry in each logic region may be controlled by propagate signals from the adders and by static redundancy control signals.

Abstract: Configurable adder circuitry is provided on an integrated circuit that includes redundant circuitry. The integrated circuit may contain nonvolatile memory and logic circuitry that produces a redundancy control signal. During manufacturing, the integrated circuitry may be tested. If a defect is identified on the integrated circuit, the redundancy control signal may be used in switching redundant circuitry into place bypassing the defect. The integrated circuit may contain an array of logic regions. Each logic region may contain adders and multiplexer circuitry for selectively combining the multiplexers to form larger adders. The multiplexer circuitry in each logic region may be controlled by propagate signals from the adders and by static redundancy control signals.

Abstract: Configurable time-borrowing flip-flops may be based on configurable pulse generation circuitry and pulse latches. The circuitry may use a self-timed architecture that controls the width of clock pulses that are generated so that the pulse latches that are controlled by the clock pulses exhibit a reduced risk of race through conditions. Latch circuitry may be provided that is based on a pulse latch and an additional latch connected in series with the pulse latch. In situations in which there is a potential for race through conditions on an integrated circuit, the additional latch may be switched into use to convert the latch circuitry into an edge-triggered flip flop. Clock trees may be provide with configurable shorting structures that help to reduce clock skew. Low-contention clock drivers may drive signals onto the clock tree paths.