Diamond: ECP2: How many generic routing signals can be used as primary clocks in a LatticeECP2/M device?
Diamond: ECP2: In a LatticeECP2/M, the primary clocks, whether they're global or quadrant, get their sources through a center MUX. The number of generic routing signals that can get onto the center MUX is 10. These 10 signals come from FPGA routing fabric - not from PLL/DLL, clkdiv component, or clock pins. In order to use all 10 of the generic routing signals as primary clocks, quadrant clocks have to be used. User can turn the 10 generic routing signals into primary clocks in 2 quadrants, because there is 8 primary clock lines per quadrant.