MPC885CZP133 datasheet(71/92 Pages) FREESCALE

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MPC885/MPC880 Hardware Specifications, Rev. 3

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.

MHz

US4

USBCLK duty cycle (measured at 1.5 V)

UtpClk

UTPB

TxEnb

SOC

TxClav

PHSELn

High-Z at MPHY

High-Z at Multi-PHYP

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