MPC8314ECVRAGDA datasheet(24/101 Pages) FREESCALE

24 / 101 page

MPC8314E PowerQUICC II Pro Processor Hardware Specifications, Rev. 2

Freescale Semiconductor

Ethernet: Three-Speed Ethernet, MII Management

9.2

MII, RMII, RGMII, and RTBI AC Timing Specifications

The AC timing specifications for MII, RMII, RGMII, and RTBI are presented in this section.

9.2.1

MII AC Timing Specifications

This section describes the MII transmit and receive AC timing specifications.

9.2.1.1

MII Transmit AC Timing Specifications

This table provides the MII transmit AC timing specifications.

This figure shows the MII transmit AC timing diagram.

Figure 9. MII Transmit AC Timing Diagram

Note:

1. The symbol VIN, in this case, represents the LVIN symbol referenced in Table 1 and Table 2.

Table 25. MII Transmit AC Timing Specifications

At recommended operating conditions with LVDD of 3.3 V ± 300 mv.

Parameter/Condition

Symbol 1

Min

Typ

Max

Unit

TX_CLK clock period 10 Mbps

tMTX

—400

—

TX_CLK clock period 100 Mbps

tMTX

—40—

TX_CLK duty cycle

tMTXH/tMTX

—

TX_CLK to MII data TXD[3:0], TX_ER, TX_EN delay

tMTKHDX

TX_CLK data clock rise VIL(min) to VIH(max)

tMTXR

1.0

—

4.0

TX_CLK data clock fall VIH(max) to VIL(min)

tMTXF

1.0

—

4.0

Note:

1. The symbols used for timing specifications follow the pattern of t(first two letters of functional block)(signal)(state)(reference)(state) for

inputs and t(first two letters of functional block)(reference)(state)(signal)(state) for outputs. For example, tMTKHDX symbolizes MII transmit

timing (MT) for the time tMTX clock reference (K) going high (H) until data outputs (D) are invalid (X). Note that, in general,

the clock reference symbol representation is based on two to three letters representing the clock of a particular functional.

For example, the subscript of tMTX represents the MII(M) transmit (TX) clock. For rise and fall times, the latter convention is

used with the appropriate letter: R (rise) or F (fall).

Table 24. RGMII/RTBI (When Operating at 2.5 V) DC Electrical Characteristics (continued)

Parameters

Symbol

Conditions

Min

Max

Unit

TX_CLK

TXD[3:0]

tMTKHDX

tMTX

tMTXH

tMTXR

tMTXF

TX_EN

TX_ER

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