IBIS Model
5571 - Why do I need to migrate from ispPAC-POWR1208 to ispPAC-POWR1014A?
Please check "PCN# 13A-10" document for more information why ispPAC-POWR1208 was discontinued. Basically, one of Lattice's fab partners, which produces this part number, ceases its operations. Shifting to another fab facility requires retooling of ...
1911 - How can I generate a much smaller IBIS model file that only includes the IO types defined in my project?
Situation: An IBIS model file from the Lattice web site includes all the programmable IO types a device can be set to, but the IBIS model file is very large and for some simulators, can slow the simulation setup time substantially. It is desired to ...
2365 - What kind of models can I use to simulate Lattice IO packages parasitics?
Solution:Lattice provides both IBIS and HSPICE models to evaluate IO parasitics on Lattice devices. •IBIS models: ◦You can find IBIS models for most Lattice packages by visiting the device family web page, and clicking on the IBIS Models link at the ...
1779 - 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 ...
1756 - 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.
7120 - MachXO5 : What is the Thermal Resistance Specification for MachXO5 devices caBGA/BBG package
MachXO5 devices base package is based on caBGA and BBG is the variation. Per stated in Part Number Description, Lattice support both BBG256/400 packages. User should follow BBG package Thermal Resistance Specification for MachXO5 devices. Example: ...
729 - 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 ...
7335 - Is there an available 3d model for any Lattice FPGA Devices?
Lattice is not providing the 3D solid model but user can find the package diagram via FPGA-DS-02053.
7295 - Crosslink-NX: How to use other RLC package models in an IBIS model?
To use other RLC package models in an IBIS model: 1. Open the IBIS file in a text editor. 2. Scroll down, and under the [Package] keyword, you will see the various package models available for use. 3. Using the commenting character "|", comment the ...
2709 - 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.
5916 - [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. ...
463 - 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).
432 - 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 ...
6567 - Crosslink: What is the meaning of "aaa" characters in the Crosslink IBIS model?
Description: The "aaa" characters are unused for Crosslink devices but might be used for other devices (i.e., Crosslink-NX). These "aaa" characters are only added to comply with the 20 characters of the naming convention.
2641 - In the Lattice IBIS files, the series resistance code of all IO type is 'a', which mean "off". I want to know in simlation, what resistance value should I set for output?
There are two ways to specify the output drivers. One is to specify series resistance, the other is to specify output current. Lattice IBIS models specify output current. They are equivalent. For example, 4mA is equivalent to 100ohms (0.4V(vol ...
1561 - 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 ...
325 - How can I estimate the pull up and pull down resistors of Lattice's CPLD and FPGA devices?
User can find I/O Active Pull-up Current (Ipu), I/O Active Pull-down Current (Ipd), and the voltage for the I/O ports (e.g., Vccio) in Lattice's data sheets. User can derive the pull up and pull down resistor values by dividing the voltage by the ...
312 - Which Lattice devices have evaluation boards to try out my code?
The Development kits are available through Lattice Distributors and through the Lattice On-Line store. User may check the following link for Lattice Semiconductor Development Kits: Lattice Semiconductor Development Kit
2009 - 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 ...
6962 - How to solve the correlation issue when using LVDS receiver input (i.e. lvs180axxxeaaaaabain)?
The user has to instantiate 2 input IBIS receivers and put 100Ohm between input terminals for termination.
2008 - 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 up For the JTAG output pin (TDO), use LVCMOS output type, bank 0 ...
6144 - ECP5: Does the ECP5 IBIS model support Keysight's ADS tool?
Yes, the device supports Keysight's ADS for the ECP5 IBIS model.
178 - 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 ...
176 - 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 ...
1385 - How many times can Lattice devices withstand reflow oven or wave soldering?
The majority of Lattice devices are in surface mount (SMT) packages. Our SMT packages are qualified for 3 reflow cycles. We do not have data for wave soldering because it is a soldering technology mainly for through-hole components. For more detailed ...
6101 - If i am using LDO to provide the voltage supply to FPGA, can i omit the recommended ferrite beads from the power rail design?
Please always follow the recommendation from Hardware Checklist. If user decide to omit the recommended ferrite beads implementation, user should bear the risk in the design.
121 - 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 ...