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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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IMXRT1024IEC датащи(PDF) 44 Page - NXP Semiconductors |
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IMXRT1024IEC датащи(HTML) 44 Page - NXP Semiconductors |
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44 / 90 page  i.MX RT1024 Crossover Processors Data Sheet for Industrial Products, Rev. 0, 11/2020 44 NXP Semiconductors Electrical characteristics Figure 19. SEMC input timing in SYNC mode 4.5.2 FlexSPI parameters1 Measurements are with a load 15 pf and input slew rate of 1 V/ns. 4.5.2.1 FlexSPI input/read timing There are four sources for the internal sample clock for FlexSPI read data: • Dummy read strobe generated by FlexSPI controller and looped back internally (FlexSPIn_MCR0[RXCLKSRC] = 0x0) • Dummy read strobe generated by FlexSPI controller and looped back through the DQS pad (FlexSPIn_MCR0[RXCLKSRC] = 0x1) • Read strobe provided by memory device and input from DQS pad (FlexSPIn_MCR0[RXCLKSRC] = 0x3) The following sections describe input signal timing for each of these four internal sample clock sources. 4.5.2.1.1 SDR mode with FlexSPIn_MCR0[RXCLKSRC] = 0x0, 0x1 1. The FlexSPI is used for internal flash by default for RT1024. Table 36. FlexSPI input timing in SDR mode where FlexSPIn_MCR0[RXCLKSRC] = 0X0 Symbol Parameter Min Max Unit — Frequency of operation — 60 MHz TIS Setup time for incoming data 8.67 — ns TIH Hold time for incoming data 0 — ns Table 37. FlexSPI input timing in SDR mode where FlexSPIn_MCR0[RXCLKSRC] = 0X1 Symbol Parameter Min Max Unit — Frequency of operation — 133 MHz TIS Setup time for incoming data 2 — ns TIH Hold time for incoming data 1 — ns |
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