MPC8568E datasheet(33/139 Pages) FREESCALE

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MPC8568E/MPC8567E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 1

Freescale Semiconductor

Ethernet Interface and MII Management

8.2.3.1

MII Transmit AC Timing Specifications

Table 29 provides the MII transmit AC timing specifications.

Figure 12 shows the MII transmit AC timing diagram.

Figure 12. MII Transmit AC Timing Diagram

8.2.3.2

MII Receive AC Timing Specifications

Table 30 provides the MII receive AC timing specifications.

Table 29. MII Transmit AC Timing Specifications

At recommended operating conditions with L/TVDD of 3.3 V ± 5%.

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 (20%-80%)

tMTXR

1.0

—

4.0

TX_CLK data clock fall (80%-20%)

tMTXF

1.0

—

4.0

Note:

1. The symbols used for timing specifications herein 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).

2. Guaranteed by design.

Table 30. MII Receive AC Timing Specifications

At recommended operating conditions with L/TVDD of 3.3 V ± 5%.

Parameter/Condition

Symbol 1

Min

Typ

Max

Unit

RX_CLK clock period 10 Mbps

tMRX

—400

—

RX_CLK clock period 100 Mbps

tMRX

—40

—

RX_CLK duty cycle

tMRXH/tMRX

—

TX_CLK

TXD[3:0]

tMTKHDX

tMTX

tMTXH

tMTXR

tMTXF

TX_EN

TX_ER

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