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I'm trying to simulate ICE5LP1K FPGA internal oscillator on ModelSim. My design includes the following instance:

SB_HFOSC OSCInst1 (
  .CLKHFEN(1'b1),
  .CLKHFPU(1'b1),
  .CLKHF(CLKLF)
)

I included sb_ice_syn.v file but have a design loading error:

Error: ../testbench/sb_ice_syn.v(26066): Module 'SB_HFOSC_CORE' is not defined

I'm not able to find SB_HFOSC_CORE module in the lattice installation folder. Where can I find the missed modules?

John Paul
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Tigran
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2 Answers2

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Doing ModelSim simulation of a Lattice ICE40 family (ICE5LP1K device) design with PLLs requires that a Verilog model of the PLL is included. This is described in Lattice Application Note AN006 (see "c:\lscc\iCEcube2.2015.04\doc\Modelsim_AN006.pdf" for latest iCEcube2 version) on page 9:

If your design contains PLL, add ABIPTBS8.v and ABIWTCZ4.v in $INST_DIR/verilog. For performing Post-Synth simulation for a VHDL design having PLL, you will require a mixed-language simulator, since the PLL model (ABIPTBS8.v) is available only in verilog format. If the design contains Hardened IP primitives, add the encrypted Verilog simulation library sb_ice_ipenc_modelsim.v available in $INST_DIR/Verilog.

An alternative is if you write a simple simulation model of the SB_HFOSC_CORE PLL core, and then include this in the simulation, since I assume that your focus is on verification of the remaining design, so you probably only need the PLL to give a usable clock.

Morten Zilmer
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  • Actually I'm doing all necessary steps but still unsuccessful. I added sb_ice_syn.v file, where is defined the HFOSC module. But the HFOSC module has an instance named "SB_HFOSC_CORE" and I'm not able to find any module declaration for the "SB_HFOSC_CORE" instance. – Tigran Sep 14 '15 at 11:54
  • Maybe Lattice support can help then, since it may be a bug, or for a work-around make a simulation model of the `SB_HFOSC_CORE` PLL core if that will be enough for your purpose. – Morten Zilmer Sep 14 '15 at 12:02
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It is working now. I found the missing module in the sb_ice_ipenc_modelsim.v

Tigran
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