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Altera_Forum
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11 years agoHow to constrain a clock coming from HPS as input clock to FPGA?
Hi I am Using Cyclone V SoC 5CSXFC6C6U23I7. to build the system I have used HPS output clock for FPGA. so there is no clock PIN I have used in My design from FPGA side. Hence I am unable to ap...
Altera_Forum
Honored Contributor
11 years ago --- Quote Start --- Which version of Quartus are you using and which user clock are you exposing to the FPGA fabric? I thought these were automatically constrained but it doesn't sound like that's the case after all. --- Quote End --- Quartus II 64 bit Version 14.0.2 Build 209 09/17/2014 SJ Full version I am using "HPS-to-FPGA user 0 clock" with frequency 25 Mhz for FPGA fabric It is input to pll with name SubClk as shown below and several outputs are taken from PLL alteraplliiop alteraplliiop // Altera's PLL macro ( // Outputs .locked (PllLock) , .outclk_0 (Clk125) // 125MHz , .outclk_1 (Clk625) // 62.5MHz (IBCMCLK) , .outclk_2 (RxClk625) // 62.5MHz , .outclk_3 () // 100MHz (Not use) , .outclk_4 (Clk25) // 25MHz , .outclk_5 () // 15.625MHz (Not use) // Inputs , .refclk (SubClk) // Refclk 25MHz , .rst (~nPllReset) // Reset ); Total logic utilization is 66%. If you need some more information related to it them please ask me because there are lot of timing violation