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Hi,
I'm using the STRATIX 2 GX and the ALT2GXB. So I will transmit and receive the data with 6250 Mbps. I programm the Stratix 2 GX with Quartus 8.0. This are my configuration: Protocol: Basic Double Width Mode Operation Mode: Receiver and Transmitter Channel: 1 Channel Width: 32 bit Input Clock: 156.25 Mhz Data rate: 6250 Mbps If I compile my project, the "Analysis & Synthesis" part runs error free. But after that, the fitter gives an error. This is the error message: CRU output frequency 2500 Mhz (datarate 6250.0Mbps) of the receiver PLL of GX receiver channel atom "alt2gxb0:inst|alt2gxb:alt2gxb......" must be in the frequency range of 499.8 Mhz (datarate 1000Mbps) to 2127.7 Mhz (datarate 4255.3 Mbps). Do someone know, how I can eliminate this error?? If I put the data rate to 3906.25 Mhz the project runs without a problem. Because of this problem, I have read the handbook of the Stratix 2 GX again and I think on page 2-62 stands something about this problem. But it doesn't help me. I hope someone in the forum can help me. Many Thanks yknarfLink Copied
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Hello,
I have found the answer of my problem. The answer of the problem is, that only a Startix II GX with a speed grad of 3 can suport High speed transceivers up to 6.375Gbps. When you use an other speed grade the CRU recovers a clock, which is too fast for the PLD.
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