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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PCIMX258CJM4A датащи(PDF) 67 Page - Freescale Semiconductor, Inc |
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PCIMX258CJM4A датащи(HTML) 67 Page - Freescale Semiconductor, Inc |
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67 / 144 page  i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 3 Freescale Semiconductor 67 3.7.6.2 NAND Flash Controller (NFC) Timing The i.MX25 NFC supports normal timing mode, using two Flash clock cycles for one access of RE and WE. AC timings are provided as multiplications of the clock cycle and fixed delay. Figure 34 through Figure 37 depicts the relative timing between NFC signals at the module level for different operations under normal mode. Table 53 describes the timing parameters (NF1–NF17) that are shown in the figures. Figure 34. Command Latch Cycle Timing Diagram Figure 35. Address Latch Cycle Timing Diagram 2 SDRAM CLK and DQS-related parameters are measured from the 50% point. That is, high is defined as 50% of the signal value, and low is defined as 50% of the signal value. DDR SDRAM CLK parameters are measured at the crossing point of SDCLK and SDCLK (inverted clock). 3 The value was calculated for an SDCLK frequency of 133 MHz, by the formula tQH = tHP – tQHS = min. (tCL,tCH) – tQHS = 0.45*tCK – tQHS = 0.45 * 7.5 – 0.45 = 2.925 ns NFCLE NFCE NFWE NFALE NFIO[7:0] Command NF9 NF8 NF1 NF2 NF5 NF3 NF4 NF6 NF7 NFCLE NFCE NFWE NFALE NFIO[7:0] Address NF9 NF8 NF1 NF5 NF3 NF4 NF6 NF11 NF10 NF7 |
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