Improve the DCM output - Githubissues

mithro commented 7 years ago

Make sure the constraints match the desired frequency range.
Output CSRConstants with details about frequency range.
Requires https://github.com/enjoy-digital/litex/pull/17

enjoy-digital commented 7 years ago

ok thanks.

mithro commented 7 years ago

Just FYI, we now get;

INFO:ConstraintSystem:178 - TNM 'base50_clk', used in period specification
   'TS_base50_clk', was traced into DCM_CLKGEN instance hdmi_out_dcm_clkgen. The
   following new TNM groups and period specifications were generated at the
   DCM_CLKGEN output(s): 
   CLKFX: <TIMESPEC TS_hdmi_out0_driver_clocking_clk_pix_unbuffered_0 = PERIOD
   "hdmi_out0_driver_clocking_clk_pix_unbuffered_0" TS_base50_clk / 2 HIGH 50%>

INFO:ConstraintSystem:178 - TNM
   'hdmi_out0_driver_clocking_clk_pix_unbuffered_0', used in period
   specification 'TS_hdmi_out0_driver_clocking_clk_pix_unbuffered_0', was traced
   into PLL_ADV instance hdmi_out_pll_adv. The following new TNM groups and
   period specifications were generated at the PLL_ADV output(s): 
   CLKOUT1: <TIMESPEC TS_hdmi_out0_driver_clocking_pll_clk1_0 = PERIOD
   "hdmi_out0_driver_clocking_pll_clk1_0"
   TS_hdmi_out0_driver_clocking_clk_pix_unbuffered_0 / 2 HIGH 50%>

INFO:ConstraintSystem:178 - TNM
   'hdmi_out0_driver_clocking_clk_pix_unbuffered_0', used in period
   specification 'TS_hdmi_out0_driver_clocking_clk_pix_unbuffered_0', was traced
   into PLL_ADV instance hdmi_out_pll_adv. The following new TNM groups and
   period specifications were generated at the PLL_ADV output(s): 
   CLKOUT0: <TIMESPEC TS_hdmi_out0_driver_clocking_pll_clk0_0 = PERIOD
   "hdmi_out0_driver_clocking_pll_clk0_0"
   TS_hdmi_out0_driver_clocking_clk_pix_unbuffered_0 / 10 HIGH 50%>

INFO:ConstraintSystem:178 - TNM
   'hdmi_out0_driver_clocking_clk_pix_unbuffered_0', used in period
   specification 'TS_hdmi_out0_driver_clocking_clk_pix_unbuffered_0', was traced
   into PLL_ADV instance hdmi_out_pll_adv. The following new TNM groups and
   period specifications were generated at the PLL_ADV output(s): 
   CLKOUT2: <TIMESPEC TS_hdmi_out0_driver_clocking_pll_clk2_0 = PERIOD
   "hdmi_out0_driver_clocking_pll_clk2_0"
   TS_hdmi_out0_driver_clocking_clk_pix_unbuffered_0 HIGH 50%>

----

INFO:NgdBuild:1222 - Setting CLKIN1_PERIOD attribute associated with PLL
   instance hdmi_out_pll_adv to 10.000000 ns based on the period specification
   (<TIMESPEC TS_hdmi_out0_driver_clocking_clk_pix_unbuffered = PERIOD
   "hdmi_out0_driver_clocking_clk_pix_unbuffered" TSbase50_clk / 2 HIGH 50%>).

litex-hub / litevideo

Improve the DCM output #8