By Richard Munden
Richard Munden demonstrates the right way to create and use simulation versions for verifying ASIC and FPGA designs and board-level designs that use off-the-shelf electronic elements. in accordance with the VHDL/VITAL normal, those versions contain timing constraints and propagation delays which are required for exact verification of modern day electronic designs.
ASIC and FPGA Verification: A consultant to part Modeling expertly illustrates how ASICs and FPGAs may be established within the better context of a board or a process. it's a beneficial source for any fashion designer who simulates multi-chip electronic designs.
*Provides a number of types and a in actual fact outlined technique for appearing board-level simulation.
*Covers the main points of modeling for verification of either common sense and timing.
*First publication to assemble and educate thoughts for utilizing VHDL to version "off-the-shelf" or "IP" electronic parts to be used in FPGA and board-level layout verification.
Read Online or Download ASIC and FPGA VerificationElsevier PDF
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Extra info for ASIC and FPGA VerificationElsevier
The gen_utils package is used in this model to supply default values to some generics, as shown later. Lines 7 and 8, tipd_A : VitalDelayType01 := VitalZeroDelay01; tipd_B : VitalDelayType01 := VitalZeroDelay01; declare the tipd generics, which are the interconnect delays between components on the PCB (or between boards). There should be one for each port of mode IN or INOUT in the port list. They are given default delay values of zero. Delay values for tipds must be nonnegative. For each port with an associated tipd we declare a signal to hold the delayed value of that port.
Generics are used to pass information into a model. When a generic is used to pass information into a model, it describes a constant and can only be read. A generic is declared in the model entity and used in the architecture. 3 shows our model with a generic named delay. 4 19 VITAL Additions This is an improvement. Now only one model is needed to cover many possible nand gates. But the model still has symmetrical rise and fall delays that may not match the part used in your design. Most non-CMOS components use a totempole output structure that has different drive strengths depending on whether it is driving high or low.
Line 21, VARIABLE YNeg_zd : std_ulogic := ‘U’; declares a functionality result variable. It will hold the zero delay result prior to it being scheduled for output. It must be a variable rather than a signal for the model to be level 1 compliant. The FMF convention, which follows examples given in the VITAL standard document, is to create the name for this variable by taking the name of the output port to which it refers and appending the characters _zd, for zero delay. The next line, 22, VARIABLE YNeg_GlitchData : VitalGlitchDataType; declares the glitch variable for YNeg.
ASIC and FPGA VerificationElsevier by Richard Munden