When experimenting with circuit timing, there is no permanent risk from experimentation that temporarily breaks the circuit to collect a data point.
Add registers in illegal locations to determine the effect on overall timing.
After you embed components at a higher level, the block speed may be the same.
However, the speed may never be any faster with other components than alone.
Addressing the timing closure initially with margin is much easier.
Timing closure of a slow circuit is not inherently easier than timing closure of a faster circuit, because slow circuits typically include more combinational logic between registers.
of the critical chain and its associated clock domain is limited by the average delay of a register-to-register path, and quantization delays of indivisible circuit elements like routing wires. device core architecture that includes additional registers, called Hyper-Registers, everywhere throughout the core fabric.
Hyper-Registers provide increased bandwidth and improved area and power efficiency.
bypassable Hyper-Registers, the routing signal can travel through the register first, or bypass the register direct to the multiplexer.
One bit of the FPGA configuration memory (CRAM) controls this multiplexer.
Typically, circuit components use more than 2X the area as the bus width doubles.
For a simple circuit like a mux, the area grows sub-linearly as the bus width increases.
Commonly, a design performance gradually becomes inadequate as technology requirements increase over time.