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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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IMX35 датащи(PDF) 48 Page - Freescale Semiconductor, Inc |
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IMX35 датащи(HTML) 48 Page - Freescale Semiconductor, Inc |
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48 / 148 page  i.MX35 Applications Processors for Industrial and Consumer Products, Rev. 6 Freescale Semiconductor 48 NOTE Test conditions are: pin voltage 1.7 V–1.95 V, capacitance 15 pF for all pins (both DDR and non-DDR pins), drive strength is high (7.2 mA). “High” is defined as 80% of signal value and “low” is defined as 20% of signal value. SDR SDRAM CLK parameters are measured from the 50% point—that is, “high” is defined as 50% of signal value, and “low” is defined as 50% of signal value. tCH + tCL will not exceed 7.5 ns for 133 MHz. DDR SDRAM CLK parameters are measured at the crossing point of SDCLK and SDCLK (inverted clock). The timing parameters are similar to the ones used in SDRAM data sheets. Table 33 indicates SDRAM requirements. All output signals are driven by the ESDCTL at the negative edge of SDCLK, and the parameters are measured at maximum memory frequency. Figure 29. SDRAM Refresh Timing Diagram Table 34. SDRAM Refresh Timing Parameters ID Parameter Symbol Min. Max. Unit SD1 SDRAM clock high-level width tCH 3.4 4.1 ns SD2 SDRAM clock low-level width tCL 3.4 4.1 ns SD3 SDRAM clock cycle time tCK 7.5 — ns SD6 Address setup time tAS 1.8 — ns CS CAS WE RAS ADDR BA ROW/BA SD6 SD7 SD11 SD10 SD10 SDCLK SD1 SD2 SDCLK SD3 |
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