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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPC5200 датащи(PDF) 25 Page - Freescale Semiconductor, Inc |
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MPC5200 датащи(HTML) 25 Page - Freescale Semiconductor, Inc |
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25 / 80 page  Electrical and Thermal Characteristics MPC5200 Data Sheet, Rev. 4 Freescale Semiconductor 25 3.3.5.4 Memory Interface Timing-DDR SDRAM Write Command Figure 9. DDR SDRAM Memory Write Timing 3.3.6 PCI The PCI interface on the MPC5200 is designed to PCI Version 2.2 and supports 33-MHz and 66-MHz PCI operations. See the PCI Local Bus Specification [4]; the component section specifies the electrical and timing parameters for PCI components with the intent that components connect directly together whether on the planar or an expansion board, without any external buffers or other “glue logic.” Parameters apply at the package pins, not at expansion board edge connectors. The MPC5200 is always the source of the PCI CLK. The clock waveform must be delivered to each 33-MHz or 66-MHz PCI component in the system. Figure 10 shows the clock waveform and required measurement points for 3.3 V signaling environments. Table 22 summarizes the clock specifications. Table 21. DDR SDRAM Memory Write Timing Sym Description Min Max Units SpecID tmem_clk MEM_CLK period 7.5 — ns A5.20 tDQSS Delay from write command to first rising edge of MDQS —tmem_clk+0.4 ns A5.21 MEM_CLK Control Signals MDQ (Data) MEM_CLK MDQS (Data Strobe) NOTE: Control Signals signals are composed of RAS, CAS, MEM_WE, MEM_CS, MEM_CS1 and CLK_EN Write Write Write tdqss Write |
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