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AT697F датащи(PDF) 82 Page - ATMEL Corporation |
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AT697F датащи(HTML) 82 Page - ATMEL Corporation |
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82 / 176 page ![]() 82 AT697F 7703E–AERO–08/11 Three configuration are available: • natural skew (SKEW[1:0] = 00), this is the standard clock-tree as routed internally • medium skew (SKEW[1:0] = 01), the 3 clock-trees are shifted away in time one from each other • maximum skew (SKEW[1:0] = 10), the 3 clock-trees are further shifted away in time Table 22. SKEW Assignements 00 natural natural natural skew 01 D1 D3 medium skew 10 D1 + D2 D3 + D4 maximum skew 11 reserved (shall not be used) Note: Medium skew and maximum skew configurations improve SET protection but lead to reduced operating performance: maximum clock frequency is reduced and timings are slower than when configured for natural skew (see "Electrical Characteristics"). SKEW[1:0] DELAY Comments CLK1 -> CLK2 CLK1 -> CLK3 |
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