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MPC885CZP133 데이터시트(PDF) 71 Page - Freescale Semiconductor, Inc |
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MPC885CZP133 데이터시트(HTML) 71 Page - Freescale Semiconductor, Inc |
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71 / 92 page ![]() MPC885/MPC880 Hardware Specifications, Rev. 3 71 Freescale Semiconductor USB Electrical Characteristics Figure 71 shows signal timings during UTOPIA transmit operations. Figure 71. UTOPIA Transmit Timing 14 USB Electrical Characteristics This section provides the AC timings for the USB interface. 14.1 USB Interface AC Timing Specifications The USB Port uses the transmit clock on SCC1. Table 33 lists the USB interface timings. 15 FEC Electrical Characteristics This section provides the AC electrical specifications for the fast Ethernet controller (FEC). Note that the timing specifications for the MII signals are independent of system clock frequency (part speed designation). Also, MII signals use TTL signal levels compatible with devices operating at either 5.0 V or 3.3 V. Table 33. USB Interface AC Timing Specifications Name Characteristic All Frequencies Unit Min Max US1 USBCLK frequency of operation 1 Low speed Full speed 1 USBCLK accuracy should be ±500 ppm or better. USBCLK may be stopped to conserve power. 6 48 MHz MHz US4 USBCLK duty cycle (measured at 1.5 V) 45 55 % UtpClk UTPB TxEnb 1 2 SOC 5 TxClav PHSELn 3 4 5 High-Z at MPHY High-Z at Multi-PHYP U1 U1 U2 U2 U2 U3 U4 |
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