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 ...
Current rating for VCCIO 3.3 from data sheet (Min 11uA Max128uA) For LVCMOS33 -> Vih(min) is 2.0V Hence Rp = 3.3V - 2.0V / (11uA) = 18.18K Ohm For LVCMOS33 -> Vih(min) is 2.0V Hence Rp = 3.3V - 2.0V / (128uA) = 10.15K Ohm
From note 4 on page 28 of FPGA-DS-02008, VPP_2V5 can optionally be connected to a 1.8 V (+/-5%) power supply in Slave SPI Configuration modes subject to the condition that none of the HFOSC/LFOSC and RGB LED driver features are used. Otherwise, ...
Description: Using the RAMP data in the IBIS you can compare the Slew Rate between SLOW and FAST, try to understand the document using the notes and legends provide especially "Naming Conventions" in the upper part of the document and be able to read ...
For iCEcube2 compatible devices (LP/HX/LM/Ultra/UltraLite/UltraPlus), the user needs to use the SB_IO primitive and override the IO_STANDARD parameter to SB_LVDS_INPUT as shown in the rudimentary example below: SB_IO SB_IO_inst ( ...