MPC5553 datasheet(45/60 Pages) FREESCALE

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Electrical Characteristics

MPC5553 Microcontroller Data Sheet, Rev. 0

Preliminary—Subject to Change Without Notice

Freescale Semiconductor

3.14

Fast Ethernet AC Timing Specifications

MII signals use TTL signal levels compatible with devices operating at 3.3 V. Note that the timing

specifications for the MII signals are independent of system clock frequency (part speed designation).

3.14.1

MII Receive Signal Timing (RXD[3:0], RX_DV, RX_ER, and RX_CLK)

The receiver functions correctly up to a RX_CLK maximum frequency of 25 MHz +1%. There is no

minimum frequency requirement. In addition, the processor clock frequency must exceed 4

× the RX_CLK

frequency.

Table 28 lists MII receive channel timings.

Figure 28 shows MII receive signal timings listed in Table 28.

Figure 28. MII Receive Signal Timing Diagram

Table 28. MII Receive Signal Timing

Num

Characteristic

Min

Max

Unit

RXD[3:0], RX_DV, RX_ER to RX_CLK setup

—

RX_CLK to RXD[3:0], RX_DV, RX_ER hold

—

RX_CLK pulse width high

35%

65%

RX_CLK period

RX_CLK pulse width low

35%

65%

RX_CLK period

RX_CLK (input)

RXD[3:0] (inputs)

RX_DV

RX_ER

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