FX3 crystal clock and pclk | Cypress Semiconductor
FX3 crystal clock and pclk
We are planning to develop custom board with cypress FX3 chip and FPGA. We are trying to implement FX3 synchronous slave fifo interface with FPGA.
1) In FX3 chip, what is the use of XTAL IN & OUT, CLKIN and CLKIN_32. It mentioned in document as “can be left unconnected if they are not used”. Anyways there is no “CLKOUT” pin in FX3 as FX2, so we can’t take outside to external FPGA.
2)In our design, we are using slave fifo interface and PCLK is driven form FPGA to FX3. Whether GPIF II slave fifo works on crystal clock or PCLK.? Also whether we can provide both clocks PCLK and Crystal clock to FX3.