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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) 20 Page - Freescale Semiconductor, Inc |
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MPC5200 датащи(HTML) 20 Page - Freescale Semiconductor, Inc |
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20 / 80 page  MPC5200 Data Sheet, Rev. 4 Electrical and Thermal Characteristics Freescale Semiconductor 20 3.3.5 SDRAM 3.3.5.1 Memory Interface Timing-Standard SDRAM Read Command Figure 5. Timing Diagram—Standard SDRAM Memory Read Timing 3.3.5.2 Memory Interface Timing-Standard SDRAM Write Command In Standard SDRAM, all signals are activated on the Mem_clk from the Memory Controller and captured on the Mem_clk clock at the memory device. Table 18. Standard SDRAM Memory Read Timing Sym Description Min Max Units SpecID tmem_clk MEM_CLK period 7.5 — ns A5.1 tvalid Control Signals, Address and MBA Valid after rising edge of MEM_CLK —tmem_clk*0.5+0.4 ns A5.2 thold Control Signals, Address and MBA Hold after rising edge of MEM_CLK tmem_clk*0.5 — ns A5.3 DMvalid DQM valid after rising edge of MEM_CLK — tmem_clk*0.25+0.4 ns A5.4 DMhold DQM hold after rising edge of MEM_CLK tmem_clk*0.25-0.7 — ns A5.5 datasetup MDQ setup to rising edge of MEM_CLK — 0.3 ns A5.6 datahold MDQ hold after rising edge of MEM_CLK 0.2 — ns A5.7 MEM_CLK Control Signals MDQ (Data) MA (Address) NOTE: Control Signals are composed of RAS, CAS, MEM_WE, MEM_CS, MEM_CS1 and CLK_EN Active NOP READ NOP NOP NOP NOP thold Row Column MBA (Bank Selects) tvalid thold tvalid thold tvalid DQM (Data Mask) DMvalid DMhold NOP datahold datasetup |
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