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author | Christina Quast <chrysh.ng+git@gmail.com> | 2014-12-05 15:51:13 +0100 |
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committer | Christina Quast <chrysh.ng+git@gmail.com> | 2014-12-05 15:51:13 +0100 |
commit | 228265d7b33c81580a56295858ac14b67e91bf2f (patch) | |
tree | 8ac179c0028c3c2598708576fa8203b083a6e9cb /clk_calc.py | |
parent | bc04ac800ab884f8bedfe7e913fe5c1be7a718fc (diff) |
Clock calculator python script
Diffstat (limited to 'clk_calc.py')
-rw-r--r-- | clk_calc.py | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/clk_calc.py b/clk_calc.py new file mode 100644 index 0000000..11eda9f --- /dev/null +++ b/clk_calc.py @@ -0,0 +1,22 @@ +# frequ in MHz +f=18.432 +ftarg=64.0 + +# PLL range: 60 MHz <= PLL <= 130 MHz +# MUL range: 4 <= MUL <= 7 + +min_err_val=[1.0, 0.0] +min_err=f + +for mul in range(1, 8): + for div in range(1, 0x20): + err=abs((f*mul/(1.0*div)) - ftarg) + print(mul, div, err) + if(err < min_err): + min_err_val=[mul, div] + print("last minerr: %f, new minerr: %f, mul: %d, div: %d" % (min_err, err, mul, div)) + min_err=err + +print("MUL-DIV values:") +print(min_err_val) +print("Absolute error: %0.2f %% " % ((f*min_err_val[0]/min_err_val[1]-ftarg)/ftarg*100)) |