MPC8569E datasheet(59/127 Pages) FREESCALE

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Ethernet Interface

MPC8569E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 1

Freescale Semiconductor

2.6.3.4

RMII AC Timing Specifications

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

2.6.3.4.1

RMII Transmit AC Timing Specifications

The following table shows the RMII transmit AC timing specifications.

The following figure shows the RMII transmit AC timing diagram.

Figure 19. RMII Transmit AC Timing Diagram

2.6.3.4.2

RMII Receive AC Timing Specifications

The following table provides the RMII receive AC timing specifications.

Table 30. RMII Transmit AC Timing Specifications

For recommended operating conditions, see Table 3

Parameter

Symbol

Min

Typ

Max

Unit

Note

REF_CLK clock period

tRMT

—

20.0

—

REF_CLK duty cycle

tRMTH

—

REF_CLK peak-to-peak jitter

tRMTJ

——

250

—

Rise time REF_CLK (20%–80%)

tRMTR

1.0

—

4.0

—

Fall time REF_CLK (80%–20%)

tRMTF

1.0

—

4.0

—

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

tRMTDX

2.0

—

10.0

—

Table 31. RMII Receive AC Timing Specifications

For recommended operating conditions, see Table 3

Parameter

Symbol

Min

Typ

Max

Unit

Note

REF_CLK clock period

tRMR

—

20.0

—

REF_CLK duty cycle

tRMRH

—

REF_CLK peak-to-peak jitter

tRMRJ

—

250

Rise time REF_CLK (20%–80%)

tRMRR

1.0

—

4.0

REF_CLK

TXD[1:0]

tRMTDX

tRMT

tRMTH

tRMTR

tRMTF

TX_EN

TX_ER

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