Achronix Semiconductor Corporation

Namit Varma

Virantha N Ekanayake

Christopher C LaFrieda

Sarma Jonnavithula

Mohan Krishna Vedam

Shirish Jawale

Distribution of a reset signal across a system-on-chip (SoC) may be the highest latency signal in the circuit. As a result, the operating frequency of the device is reduced to ensure that the reset signal reaches all intellectual property (IP) blocks during a single clock cycle. A reset synchronizer receives the clock signal and the reset signal as inputs and generates a synchronous reset signal as an output. The synchronous reset signal has a fixed timing relationship with the clock signal. The clock signal may be paused when a reset signal is received. As a result, distribution of the synchronous reset signal may be performed without regard to the latency of the signal. After the synchronous reset signal has been received by all of the IP blocks, reset is deasserted and the clock signal is resumed.

Synchronous reset deassertion circuit

An advanced timing mode has a path that originates from a host application-specific integrated circuit (ASIC) and terminates at a register inside an embedded field programmable gate array (FPGA), bypassing interface cluster registers. The terminating register may be present at a boundary between the host ASIC and the embedded FPGA or deep inside the embedded FPGA. In a clock trunk input with internal divergence timing scenario, a clock output from a phase-locked loop (PLL) in the host ASIC is driven through a clock trunk into the embedded FPGA and, from there, diverges into interface cluster registers and the boundary adjacent to the host ASIC. A clock trunk input with external divergence timing scenario is similar to the internal divergence scenario except that a clock divergence occurs before the clock enters a clock trunk of the embedded FPGA. In a boundary clock input scenario, a PLL drives both the host ASIC and the embedded FPGA interface clusters.

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Namit Varma