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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPC8247VRP датащи(PDF) 22 Page - Freescale Semiconductor, Inc |
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MPC8247VRP датащи(HTML) 22 Page - Freescale Semiconductor, Inc |
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22 / 60 page  MPC8272 PowerQUICC II™ Family Hardware Specifications, Rev. 1.5 22 Freescale Semiconductor AC Electrical Characteristics Figure 10 shows signal behavior in MEMC mode. Figure 10. MEMC Mode Diagram NOTE Generally, all MPC8272 bus and system output signals are driven from the rising edge of the input clock (CLKin). Memory controller signals, however, trigger on four points within a CLKin cycle. Each cycle is divided by four internal ticks: T1, T2, T3, and T4. T1 always occurs at the rising edge, and T3 at the falling edge, of CLKin. However, the spacing of T2 and T4 depends on the PLL clock ratio selected, as shown in Table 13. Figure 11 is a representation of the information in Table 13. Figure 11. Internal Tick Spacing for Memory Controller Signals Table 13. Tick Spacing for Memory Controller Signals PLL Clock Ratio Tick Spacing (T1 Occurs at the Rising Edge of CLKin) T2 T3 T4 1:2, 1:3, 1:4, 1:5, 1:6 1/4 CLKin 1/2 CLKin 3/4 CLKin 1:2.5 3/10 CLKin 1/2 CLKin 8/10 CLKin 1:3.5 4/14 CLKin 1/2 CLKin 11/14 CLKin CLKin V_CLK Memory controller signals sp34/sp30 CLKin T1 T2 T3 T4 CLKin T1 T2 T3 T4 for 1:2.5 for 1:3.5 CLKin T1 T2 T3 T4 for 1:2, 1:3, 1:4, 1:5, 1:6 |
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