Honored Contributor
Honored ContributorHm I have a similar problem with accessing the High-Speed Oscillator 156.25 Mhz on the Stratix II PCIe Devkit board. If i want to assign the H7 (pin in the manual) to the clocksignal in my design, and compile the design i see at the RTL-Viewer that the clocksignal it is stuck at GND. So my component doesn't get a beat.
For I/O Standard I use 1.5-V PCML, at using all the other standards the compilation fails. can i use this clock in normal design or only in gxbs ? and which settings do I need for using it (the devkit manual doesnt mention it). Do I need an PLL or can I connect it directly ? The other oscillators 25 MHz and 100 MHz I can use normaly with LVDS as IO-Standard. If I use LVDS in as I/O Standard the following exception occurs at compilation: Error: Can't place IO "clock_highres" in GXB Ref Clock Pin_H7 because the IO does not have a differential IO standard, or correct Stratix II GX GXB REFCLK Coupling and Termination setting. Info: The supported differential I/O standards are LVDS, Differential LVPECL, 3.3-V PCML, 1.5-V PCML, or 1.2-V PCML. Info: The supported Stratix II GX GXB REFCLK coupling and termination settings are "OCT 100 Ohms" and "DC coupling external termination". Did i miss any point ? Thank you so far
