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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SPEAR1340 датащи(PDF) 179 Page - STMicroelectronics |
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SPEAR1340 датащи(HTML) 179 Page - STMicroelectronics |
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179 / 200 page  SPEAr1340 Timing characteristics Doc ID 023063 Rev 4 179/200 The setup time is calculated considering: ● maximum error = 235 ps ● maximum data skew = 20 ps Ts calculation formula Ts= Tclk/4–data_skew –max_error= 469 ps – 20 ps – 235 ps = 214 ps The hold time, instead, is calculated considering: ● maximum error = 0 ps ● maximum data skew = 20 ps Th calculation formula Th= Tclk/4-data_skew + max_error= 469 ps – 20 ps + 0 ps = 449 ps Figure 40. DQS and DQ signals timing waveform Table 92. DQS and DQ signals timing characteristics Symbol Description Value Unit TCLK Mem_clk period 1.875 ns Ts Setup time for DQS/DQ receive data 214 ps Th Hold time DQS/DQ receive data 449 ps Signals at memory interface DQS DQ D0 D1 D2 D3 Signals at PHY interface DQS sampled pattern DQS edge detection max error Th DQS DQ Ts data skew DQ sampled pattern Nominal center of DQ window D0 D1 D2 D3 01 00 00 0 11 111 111 1 |
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