3829 - In an iCE40LP-CM81 device, can an internal oscillator be used as a clock source in the RTL design?
An internal oscillator can not be used as a clock source in the RTL design. It is only used for the device configuration.
Related Articles
5590 - Clock: How to route internal oscillator clock to the primary clock network in Radiant?
Description: This FAQ provide the guide to router internal oscillator clock to the primary clock network in Radiant. Solution: The “USE PRIMARY" option in Radiant Device Constraint Editor can be used to force-connect non-direct access ports to a ...
7561 - MACHXO3D: Why OSCH internal oscillator module fails to synthesize in MachXO3D devices?
Description: The OSCH module is not applicable for MachXO3D devices. MachXO3D has its internal oscillator (called OSCJ) that can be used as a clock source in a design. Please use the OSCJ internal oscillator for MachXO3D devices. Diamond's Help page ...
5951 - iCE40UP: If an external clock/oscillator is going to be used, what pins should be used if the intention is to utilize the primary clock routing?
Description: GBIN (Global Buffer Input) pins represent the best pin to drive a global buffer from an external source. Solution: For example, in an iCE40 Ultraplus SG48 package, the pins that can be used are Pin20, Pin35, Pin37, and Pin44. After ...
2810 - With the iCE40 device,why do I see more LUTs utilized in my design than actually required?
This is true when your design is more of sequential nature, where more DFFs (D Flip-Flops) are used. The basic architecture of the iCE40 Logic Cell does not allow a direct and independent access to the DFFs. Refer to Datasheet DS1045 and DS1040 for ...
5653 - iCE40 Ultra/UltraLite: What is the accuracy of the 48MHz internal oscillator (FCLKHF) at room temperature 20 deg C and 25 deg C as well as 50 deg C? In the datasheet, I only found +- 10% but I need more information that is specific.
If you refer to FPGA-DS-02008 otherwise known as iCE40 UltaPlus Family Data Sheet, Section 4.15. Internal Oscillators, it is described in Table 4.11 in the parameter description of the said temperature ranges such that for Commercial Temp, the +/- ...