MPC8315CVRADDA datasheet(28/106 Pages) FREESCALE

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MPC8315E PowerQUICC II Pro Processor Hardware Specifications, Rev. 2

Freescale Semiconductor

Ethernet: Three-Speed Ethernet, MII Management

9.2.2

RMII AC Timing Specifications

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

9.2.2.1

RMII Transmit AC Timing Specifications

This section describes the RMII transmit and receive AC timing specifications. This table provides the

RMII transmit AC timing specifications.

This figure shows the RMII transmit AC timing diagram.

Figure 13. RMII Transmit AC Timing Diagram

9.2.2.2

RMII Receive AC Timing Specifications

This table provides the RMII receive AC timing specifications.

Table 27. RMII Transmit AC Timing Specifications

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

Parameter/Condition

Symbol 1

Min

Typ

Max

Unit

REF_CLK clock

tRMX

—20—

REF_CLK duty cycle

tRMXH/tRMX

—

REF_CLK to RMII data TXD[1:0], TX_EN delay

tRMTKHDX

—

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

tRMXR

1.0

—

4.0

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

tRMXF

1.0

—

4.0

Note:

1. The symbols used for timing specifications herein follow the pattern of t(first three 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, tRMTKHDX symbolizes RMII

transmit timing (RMT) for the time tRMX 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 tRMX represents the RMII(RM) reference (X) clock. For rise and fall times, the latter

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

Table 28. RMII Receive AC Timing Specifications

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

Parameter/Condition

Symbol 1

Min

Typ

Max

Unit

REF_CLK clock period

tRMX

—20—

REF_CLK duty cycle

tRMXH/tRMX

—

REF_CLK

TXD[1:0]

tRMTKHDX

tRMX

tRMXH

tRMXR

tRMXF

TX_EN

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