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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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IMX7DCEC датащи(PDF) 67 Page - NXP Semiconductors |
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IMX7DCEC датащи(HTML) 67 Page - NXP Semiconductors |
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67 / 161 page  Electrical characteristics i.MX 7Dual Family of Applications Processors Datasheet, Rev. 7, 09/2023 NXP Semiconductors 67 2 All measurements are in reference to Vref level. 3 Measurements were done using balanced load and 25 resistor from outputs to VDD_REF. Figure 25 shows the DDR3 write timing diagram. The timing parameters for this diagram appear in Table 48. Figure 25. DDR3 write cycle 1 To receive the reported setup and hold values, write calibration should be performed in order to locate the DRAM_SDQSx_P in the middle of DRAM_DATAxx window. 2 All measurements are in reference to Vref level. 3 Measurements were taken using balanced load and 25 resistor from outputs to DDR_VREF. Table 48. DDR3 write cycle ID Parameter Symbol CK = 533 MHz Unit Min Max DDR17 DRAM_DATAxx and DRAM_DQMx setup time to DRAM_SDQSx_P (differential strobe) tDS 225 — ps DDR18 DRAM_DATAxx and DRAM_DQMx hold time to DRAM_SDQSx_P (differential strobe) tDH 250 — ps DDR21 DRAM_SDQSx_P latching rising transitions to associated clock edges tDQSS -0.25 +0.25 tCK DDR22 DRAM_SDQSx_P high level width tDQSH 0.45 0.55 tCK DDR23 DRAM_SDQSx_P low level width tDQSL 0.45 0.55 tCK DRAM_SDCLKx_P DRAM_SDCLKx_N DRAM_SDQSx_P DRAM_DATAxx DRAM_DQMx Data Data Data Data Data Data Data Data DM DM DM DM DM DM DM DM DDR17 DDR17 DDR17 DDR17 DDR18 DDR18 DDR18 DDR18 DDR21 DDR23 DDR22 (output) (output) (output) |
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