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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPC8560CPX667JC датащи(PDF) 19 Page - NXP Semiconductors |
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MPC8560CPX667JC датащи(HTML) 19 Page - NXP Semiconductors |
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19 / 108 page  MPC8560 Integrated Processor Hardware Specifications, Rev. 4.2 Freescale Semiconductor 19 DDR SDRAM 6.2 DDR SDRAM AC Electrical Characteristics This section provides the AC electrical characteristics for the DDR SDRAM interface. 6.2.1 DDR SDRAM Input AC Timing Specifications Table 15 provides the input AC timing specifications for the DDR SDRAM interface. Figure 4. DDR SDRAM Interface Input Timing Table 15. DDR SDRAM Input AC Timing Specifications At recommended operating conditions with GVDD of 2.5 V ± 5%. Parameter Symbol Min Max Unit Notes AC input low voltage VIL —MVREF – 0.31 V — AC input high voltage VIH MVREF + 0.31 GVDD + 0.3 V — MDQS—MDQ/MECC input skew per byte For DDR = 333 MHz For DDR ≤ 266 MHz tDISKEW -750 -1125 750 1125 ps 1, 2 Note: 1.Maximum possible skew between a data strobe (MDQS[n]) and any corresponding bit of data (MDQ[8n + {0...7}] if 0 ≤ n ≤ 7) or ECC (MECC[{0...7}] if n=8). 2.For timing budget analysis, the MPC8560 consumes ±550 ps of the total budget. MDQS[n] MDQ[n] tDISKEW tDISKEW |
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