FPGA Timings P1:Static Timing Analysis(STA) with Vivado 2024

Analyze pin-to-register, register-to-register, register-to-pin, and pin-to-pin timing paths and learn how primary, virtual, and derived clocks, clock groups, skew, and input-output delay shape STA flow from synthesis to post-implementation.

Timing analysis shows why constraints matter for FPGA designs; without them, Vivado may choose slower routing paths, risking delays. Specify timing constraints to map faster paths to fast resources.

Perform timing analysis with Vivado 2024 by constraining the minimum delay path and accounting for crystal oscillator deviations; learn clock types, primary clocks, and initial tolerance for 25 mhz crystals.

Analyze frequency stability and jitter in FPGA timing, noting deviation of ±125 ppm at 25 MHz and how initial tolerance and external factors affect STA and XDC master clock constraints.

Define clocks with create_clock, setting period, t_on, t_off, and duty cycle; use waveform timing for rising and falling edges and phase shifts, and reference the module IO pin via get_clocking.

Derive a synchronous clock from SerDes using clock data recovery to form separate domains. Use create_clock for the recovered clock and the system clock; apply IBUFDS for differential clocks.

Explore manual and automatic methods to define a generated clock in XDC, detailing source, multiply-by, divide-by, and pin. See a 100 MHz to 50 MHz divide-by-two example.

Learn how report_clocks reveals clock details, including primary and generated clocks, with attributes P, G, A, R, V, I, and S, and supports post-synthesis timing analysis.

See how a pll generates an output clock from a multiplied input clock, with a 5 ns period, and how Vivado auto-derives generated clock constraints for derived clocks.

Analyze timing across a multi-register system by mastering single-register timing parameters and evaluating timing between successive registers to ensure timing requirements along the entire path meet design specifications.

Explain how a single JK latch uses cross-coupled NAND gates to form memory, shows clocking with J and K inputs, and demonstrates set–reset behavior.

Explore setup and hold time in a JK flip-flop, ensuring data stabilizes before the clock edge and remains stable after, to avoid metastability and honor tpd delays.

Explains how setup time and hold time constrain D_in at clock edges to yield predictable outputs; changes between setup and clock edges or during hold time cause unpredictable, metastable results.

Examine setup and hold timing with D flip-flop in Verilog, using a 5 ns clock and set_input_delay max 6 and min 3. Show a setup violation and no hold violation.

Learn how setup and hold violations appear in timing reports and how changing period and delays affects data arrival and hold stability after synthesis and implementation.

Analyze the register-to-register timing constraint across two registers, detailing the launch edge and latch edge, with ideal clock-to-output delay assumed zero.

Explain data arrival time and why timing analysis uses the maximum (worst-case) clock delay from source to destination register to ensure correct sampling.

Understand why minimum clock delay is used in data required time, and how both maximum and minimum delays influence when the destination register samples data.

Explain how data arrival time and data required time establish setup slack in an FPGA timing path, creating positive margins for correct sampling. Negative slack signals timing violations.

Refines FPGA timing by applying clock path removal (CPR) to account for the common clock path to source and destination registers, improving data required time and data arrival time.

Explore the report timing summary to analyze WNS, setup and hold slack, and optimize near-zero critical paths using faster cells or pipelining.

Identify WHS as the minimum hold slack among paths, 0.137. Interpret positive WHS as data stable after clock; fix negative WHS with a delay buffer, skew rebalance, or clock-constraint refinement.

Compute data path delay by summing source clock-to-output delay, net delays, and LUT3 propagation to the destination register, then subtract the source clock delay to obtain the arrival time.

Compute setup slack in vivado 2024 by accounting for clock uncertainty, clock path skew, source and destination delays, and data path delay, yielding a final slack of 8.276 ns.

Compute setup slack across multiple timing paths in Vivado 2024 by combining data path delay, source/destination clock delays, clock path skew, setup time, and uncertainty, using SCD, DCD, and CPR.

Configure clock jitter with set_input_jitter in Vivado 2024. Understand the difference between total input jitter and total system jitter, and query default values using get_property and get_clocks.

Explore how input and system jitter affect clock uncertainty and timing analysis, configure jitter with set_input_jitter and set_system_jitter, and understand peak-to-peak values for primary and derived clocks.

Explore timing paths between an FPGA and external peripherals, analyzing rec to pin, pin to reg, and reg to pin paths, including source and destination registers, and external black-box peripherals.

Focus on pin to reg timing in FPGA designs, adding input delay to arrival time using min and max delays, to analyze data from external peripherals in Vivado 2024.

Explore how setup and hold times shape setup slack and hold slack for rec-to-rec, rec-to-pin, and pin-to-r paths, and when the destination register resides inside or outside an FPJ.

Assess rec to pin timing by treating the source register inside the FPGA and the destination in external periphery, with SCD, T clock PD, and TPCB.

Set up and hold constraints using a maximum delay of 5.5 nond and a minimum delay of -2.5 nond relative to the clock edge, then save to an XTC file.

Perform setup analysis for reg2pin in Vivado 2024, using a 40 ns clock, to compute setup slack from data path delay, set output delay, clock uncertainty, and source clock delay.

Analyze hold analysis in reg2pin P1 by balancing data arrival time against data required time, incorporating PCB delays, set output delay, clock uncertainty, and data path delay.

Analyze hold analysis for reg2pin P2, including chip select hold path, clock skew and uncertainty, to compute data path delay and identify a hold violation in Vivado 2024 STA.

Analyze how input pin delay, I/O delay, and net delays combine to form the total pin-to-R delay, equal to the data path delay, in setup analysis of pin2reg P5.

Compute hold and timing analysis for a pin-to-path in an FPGA using Vivado 2024, extracting period, data path delay, input delay, DCD, hold time, and clock uncertainty to obtain slack.