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FAQ

Is there an IBIS model for the POWR605?

Yes there is. Click on the Downloads tab of our website and select IBIS Models. Near the middle of the IBIS Models by Product page the ProcessorPM has a link. Click this and download the IBIS models for the ProcessorPM (POWR605).

FAQ

MachXO2:Which IBIS models should I use for the MachXO2 JTAG signal pins?

Solution:For the JTAG input pins, use the LVCMOS input models with bank 0 VCCIO and select the model that has:TCK: bus keeper = NONE TDI: bus keeper = pull up TMS: bus keeper = pull upFor the JTAG output pin (TDO), use LVCMOS output type, bank 0 VCCIO is the VCCJ value, with slow slew setting and…

FAQ

IBIS Model: How do I find the output resistance of an I/O?

An IBIS Model is a mapping of voltage to current values for a given I/O standard, slew rate, and drive strength. User can estimate the output resistance by using a simple slope formula, in relative to the flow of current.Using Ohm's law: Resistance = (delta Voltage)/(delta Current), user can…

FAQ

ECP5: Does the ECP5 IBIS model support Keysight's ADS tool?

Yes, the device supports Keysight's ADS for the ECP5 IBIS model.

FAQ

LatticeECP3: What IBIS models are needed to simulate the LatticeECP3 SERDES?

For CML simulation of the SERDES inputs or outputs, we recommended to use the LatticeECP3 HSPICE IO Kit. These HSPICE models can be requested from our website under HSPICE I/O Kit Request page.

FAQ

LatticeECP3: Does Lattice provide IBIS model for SERDES inputs and outputs of LatticeECP3?

Currently Lattice does not provide LatticeECP3 IBIS model for SERDES input and outputs such as HDINP/N and HDOUTP/N. Alternatively, we recommended you use the LatticeECP3 HSPICE IO Kit to reach their simulation goals. The Lattice HSPICE IO Kit is available under non-disclosure agreement…

FAQ

How can I view the output IO waveform with IBIS model?

There are several ways to do that:1. The typical usage of the IBIS file is to set up a simulation on an IBIS compatible simulator and have the IO output IBIS model drive a PCB trace with a receiver input attached at the end of the PCB trace, then view the waveforms.2. User can…

FAQ

MachXO:Which IBIS models should I use for the MachXO JTAG signal pins?

Solution:For the JTAG input pins, use the LVCMOS input models, input threshold voltage is referenced using the VCCAUX value, and select the model that has: TCK: bus keeper = NONE TDI: bus keeper = pull up TMS: bus keeper = pull up For the JTAG output pin TDO, use LVCMOS output type, with fast slew…

FAQ

Do Lattice's IBIS models include the RLC data for each pin?

Lattice IBIS model do not include individual pin RLC. It has the worst case package RLC which will give the worst case simulation result.

FAQ

LatticeECP3: Why are the LVDS input terminations modeled as resistors to 1.25v in the IBIS model file?

The LatticeECP3 LVDS input terminations on die include a midpoint connection to the bank VTT pins on the device. This is why it is recommended in the LatticeECP3 data sheet to leave the bank VTT pins floating when using LVDS input terminations and to not mix the use of LVDS input terminations with…

FAQ

In IBIS models, the drive high, or "[pullup]" section lists strange voltage ranges and appears to be inverted. Why is this?

The IBIS specification uses voltages relative to ground for drive-low (pulldown), but voltages relative to the appropriate supply rail for drive-high (pullup). To convert to ground-relative voltages, take the nominal I/O supply voltage and subtract the voltage value listed in IBIS. For…

FAQ

The voltage ranges in the IBIS model files typically extend beyond the limits specified in the device datasheets. Can these voltages be applied to the device?

No. The datasheet limits must never be exceeded. The IBIS standard generally specifies the range used for data points to be from -Vcc to 2*Vcc. This range is used to model the I/O behavior in more detail, and is independent of the actual device limits.

FAQ

How to get IBIS model for differential LVPECL IO when the generated model from ispLEVER is a single ended model?

The low voltage positive emitter couple logic (LVPECL) interface uses two separate single ended buffers, plus on-board resistors to emulate a differential pair. The input output buffer information standard (IBIS) requires that the models be interconnected in this manner to properly model the…

FAQ

Radiant: How to generate an IBIS file after Place and Route that will capture the I/O pin settings on Radiant?

Description:In export files flow, IBIS model and package files can be created as per device-specific directly from the tool.Solution:

FAQ

[iCE40 UltraPlus]: Can we generate IBIS models using Diamond, Radiant, and iCEcube2 Software?

Definition:Yes, Radiant and Diamond Software gives you the ability to generate IBIS model based on the user's design. Simply check "IBIS Model" in the Export options. After Export, the IBIS model can be found in the implementation folder. Unfortunately, IBIS models cannot…

Document

MachXO5-NX IBIS Model file

IBIS Model FPGA-MD-02035 1.4 ZIP 16.4MB

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iCE65 IO IBIS Model

IBIS Model 1.2 IBS 212.5KB

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iCE40 UltraPlus IBIS Model

IBIS Model 2.0 IBS 0.9MB

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[IBIS] LatticeXP2 IBIS Model

IBIS Model 2.4 IBS 34.1KB

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[IBIS] LatticeSC IBIS Model

IBIS Model 2.0 IBS 76.6KB