FPGA Software & Tools (Diamond / Radiant / ICEcube2 / IspLEVER Classic) | Pre Synthesis / Post-Synthesis Timing Constraints Editor

Pre Synthesis / Post-Synthesis Timing Constraints Editor
4072 - Diamond 3.3 / MachXO2: How can a user constraint Place & Route (PAR) for the MachXO2 built in oscillator to cover the 5% frequency tolerance variation?
Description: In Lattice Diamond 3.3 and later, PAR will accept a frequency constraint up to 5.5% above the nominal frequency setting to cover the timing variation in the oscillator over PVT. This can be done by adding a constraint in the Lattice ...
7236 - Radiant 2023.1: Why is the 'create_clock' constraint excluded from FDC?
Description: After evaluating the fix in Radiant 2022.1 for DNG-15807, the create_clock constraint in *.fdc still persists, and upon checking, the design has an unmatched constrained object in *.ldc and *.vm in which the mismatch happens before ...
7378 - All FPGA: What does the inferred clock warning "WARNING <2019993> - MT420 |Found inferred clock...with period...Please declare a user-defined clock on..."?
Description: WARNING <2019993> - MT420 |Found inferred clock cpu_pll_ipgen_lscc_pll_Z21_layer0|clkop_o_inferred_clock with period 1000.00ns. Please declare a user-defined clock on net cpu_system_i.cpu_pll_i.lscc_pll_inst.clk_50M. Solution: The ...
6529 - All FPGA: Why does PLL outputs' constraints does not propagate from ldc/fdc/sdc to Synthesis using both SynplifyPro & LSE?
Description: Lattice Diamond software does not use any pre-synthesis constraint file (SDC/LDC/FDC). Solution: There is a workaround to compensate for the limitation. Once the user has created any pre-synthesis constraint file, synthesize the design ...
6488 - All Devices: Why does 'set_multicycle_path -hold' constraint is not propagated to Synthesis using Synplify Pro FDC file?
Description: The issue is present using Radiant 3.1.1 or below on any of the available FPGA devices on the tool. Solution: There is a work around using the Tcl console in the radiant GUI, or if you opt to use the tool from the command line it is even ...

Popular Articles
What to Expect from Lattice Support?
Lattice Technical Support Expectation Please be advised that highest priority for Lattice Technical Support will be given to 1. Software which is not working as expected or suspected bugs. We recommend that customers use the latest software tools and ...
7743 - How to implement Gigabit Ethernet in Certus-NX, CertusPro-NX, MachXO5-NX and CrossLink-NX FPGAs?
Lattice currently recommends the following for implementing Gigabit Ethernet interfaces: CertusPro-NX FPGAs: Use SERDES-based SGMII or RGMII Certus-NX, MachXO5-NX, and CrossLink-NX: Use RGMII These recommendations are based on updated LVDS-based ...
6485 - Lattice Radiant: What is Glitchfilter in Device constraint editor?
Glitch Fliter is used to prevent short-duration events of glitches, This is used to prevent False tripping on noise in a system. GLITCHFilter in device constraints , enables 1ns glitch filtering.
7336 - Lattice Radiant v2023.2: How to modify I2C slave address or 96-feabits using Pseudo mode?
Description: Nexus device family has a default I2C slave address of 0x40 and you are allow to modify it based on your requirement. Solution: To permanently modify the I2C address, you can modify the desired value in .fea file and use the Programmer ...
6900 - PCIe for Nexus FPGAs: How can the PCIe configuration space settings in the RTL of the demo be interpreted?
Description: To understand the RTL formatting of the PCIe configuration space in the Nexus' PCIe demos, please refer to the following details. Figure 1 illustrates the initialization of the PCIe configuration space in the Nexus' demo.

FPGA Software & Tools (Diamond / Radiant / ICEcube2 / IspLEVER Classic) | Pre Synthesis / Post-Synthesis Timing Constraints Editor | Knowledge Base

Pre Synthesis / Post-Synthesis Timing Constraints Editor

4072 - Diamond 3.3 / MachXO2: How can a user constraint Place &amp; Route (PAR) for the MachXO2 built in oscillator to cover the 5% frequency tolerance variation?

7236 - Radiant 2023.1: Why is the 'create_clock' constraint excluded&nbsp;from FDC?

7378 - All FPGA: What does the inferred clock warning "WARNING <2019993> - MT420 |Found inferred clock...with period...Please declare a user-defined clock on..."?

6529 - All FPGA: Why does PLL outputs' constraints does not propagate from ldc/fdc/sdc to Synthesis using both SynplifyPro &amp; LSE?

6488 - All Devices: Why does 'set_multicycle_path -hold' constraint is not propagated to Synthesis using Synplify Pro FDC file?

Popular Articles

What to Expect from Lattice Support?

7743 - How to implement Gigabit Ethernet in Certus-NX, CertusPro-NX, MachXO5-NX and CrossLink-NX FPGAs?

6485 - Lattice Radiant: What is Glitchfilter in Device constraint editor?

7336 - Lattice Radiant v2023.2: How to modify I2C slave address or 96-feabits using Pseudo mode?

6900 - PCIe for Nexus FPGAs: How can the PCIe configuration space settings in the RTL of the demo be interpreted?

4072 - Diamond 3.3 / MachXO2: How can a user constraint Place & Route (PAR) for the MachXO2 built in oscillator to cover the 5% frequency tolerance variation?

7236 - Radiant 2023.1: Why is the 'create_clock' constraint excluded from FDC?

6529 - All FPGA: Why does PLL outputs' constraints does not propagate from ldc/fdc/sdc to Synthesis using both SynplifyPro & LSE?