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HDM8513 датащи(PDF) 54 Page - Hynix Semiconductor |
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HDM8513 датащи(HTML) 54 Page - Hynix Semiconductor |
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54 / 67 page ![]() 54 Example for determination of internal clock Desired internal clock: External clock supplied: N divider ratio range: 1 – 31 (integer) M divider ratio range: 1 or 4 (integer) Calculation is as follows: <Example 1> Desired internal clock: 60MHz External clock supplied: 16MHz N divider ratio range: 1 – 31 (integer) M divider ratio range: 1 or 4 (integer) Calculation is as follows: 60 =16 x N/M Case M =4, N must be 15 Case M =1, N is impossible Only one possible case exists <Example 2> Desired internal clock: 60MHz External clock supplied: 4MHz N divider ratio range: 1 – 31 (integer) M divider ratio range: 1 or 4 (integer) Calculation is as follows: 60 =4 x N/M Case M =1, N must be 15 Case M =4, N is impossible Only one possible case exists. fint_clk fext_clk fint_clk = M N fext_clk |
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