By Richard Munden
Richard Munden demonstrates tips on how to create and use simulation versions for verifying ASIC and FPGA designs and board-level designs that use off-the-shelf electronic parts. in response to the VHDL/VITAL commonplace, those types contain timing constraints and propagation delays which are required for exact verification of contemporary electronic designs. ASIC and FPGA Verification: A consultant to part Modeling expertly illustrates how ASICs and FPGAs should be demonstrated within the greater context of a board or a process. it's a important source for any fashion designer who simulates multi-chip electronic designs. *Provides various versions and a truly outlined technique for appearing board-level simulation.*Covers the main points of modeling for verification of either good judgment and timing. *First publication to gather and train ideas for utilizing VHDL to version "off-the-shelf" or "IP" electronic parts to be used in FPGA and board-level layout verification.
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Additional resources for ASIC and FPGA Verification : A Guide to Component Modeling (The Morgan Kaufmann Series in Systems on Silicon)
For example, on lines 36 and 37 we write YNeg_zd:= VitalNAND2(a=> A_ipd, b => B_ipd, Resultant => STD_wired_and_rmap); -- 36 -- 37 in which we specify that A_ipd is associated with a, and so on. Although this makes the model easier to understand, there is another important reason. Many of the VITAL functions and procedures have default parameters set in them. Because not all parameters always need to be passed during the call, named association is required to ensure the values given are passed to the right parameters.
4. 5, tpd_A_YNeg : VitalDelayType01 := UnitDelay01; -- tpd_B_YNeg : VitalDelayType01 := UnitDelay01; -- 10 9 are defined in the gen_utils package as 1 nanosecond for both rising and falling outputs. If there is no timing backannotation to the netlist, all models will exhibit a propagation delay of 1 nanosecond. It was originally assumed that a unit delay simulation would run much faster than one with realistic timing. Experience has shown this not to be the case. There is little to be gained from not using actual delays.
Together, all the paths become an array of records. The number at the beginning of each path is its index number. When the procedure is entered, all the paths are searched and the most valid is selected. The most valid path will be one for which the PathCondition is true. If there is more than one path for which the PathCondition is true, the one with the most recent event will be chosen. 5 25 Interconnect Delays with the shortest delay will be chosen. (This may not always be what is desired. ) In the event none of the paths are valid, a default delay is applied.