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clocks.sdc: slightly tune chroma clock just to be safe

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UzixLS
2020-10-08 22:47:00 +03:00
parent 54709babeb
commit 8c718a5158
1 changed files with 3 additions and 3 deletions
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6
cpld/clocks.sdc
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@ -1,5 +1,5 @@
create_clock -period 14.4MHz -name {clk_14mhz} [get_ports {clk14}]
create_clock -period 16MHz -name {clk_16mhz} [get_ports {clk16}]
create_clock -period 16.1MHz -name {clk_16mhz} [get_ports {clk16}]
# clkcpu 3.5
create_generated_clock -name {clkcpu} -divide_by 4 -source [get_ports {clk14}] [get_registers {hc0[1]}]
@ -7,8 +7,8 @@ create_generated_clock -name {clkcpu} -divide_by 4 -source [get_ports {clk14}] [
# int len in turbo = 66
create_generated_clock -name {n_int} -divide_by 64 -source [get_ports {clk14}] [get_registers {n_int~reg0}]
# chroma carrier
create_generated_clock -name {chroma_carrier} -divide_by 6 -source [get_ports {clk16}] [get_registers {*:chroma_gen1|carrier[14]}]
# chroma carrier (4.43MHz)
create_generated_clock -name {chroma_carrier} -divide_by 3 -source [get_ports {clk16}] [get_registers {*:chroma_gen1|carrier[14]}]
set_false_path -from [get_registers {r~reg0}] -to [get_clocks {clk_16mhz}]
set_false_path -from [get_registers {g~reg0}] -to [get_clocks {clk_16mhz}]