Forum Discussion
s002wjh
New Contributor
New Contributorinternal osc & global clk
is there way to get the internal osc on cyclone 3 or 4 use the global clk network? if so whats the .qsf command for that? i think the 80mhz internal osc is not using the global clk network.
SyafieqS
Super Contributor
Super ContributorHi Wen,
You may need to refer to KDB below on how to do the assignment for the GCLK,PCLK,RCLK etc.
s002wjhNew Contributor
New Contributorso if timing my constraint is like this
create_clock -name "div2_clk" -period 25.000 [get_registers {frequency_divider:frequency_divider_inst|clk_div2}]
create_generated_clock -divide_by 2 -source [get_registers {frequency_divider:frequency_divider_inst|clk_div2}] -name div4_clk [get_registers {frequency_divider:frequency_divider_inst|clk_div4}]
do i need write something like this? for global clk network? i divide the internal osc by 4
set_location_assignment CLKCTRL_G2 -to "get_registers {frequency_divider:frequency_divider_inst|clk_div4}~clkctrl"
