MPC8308CVMAGDA datasheet(17/88 Pages) FREESCALE

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MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 1

Freescale Semiconductor

Ethernet: Three-Speed Ethernet, MII Management

8.2.1.1

MII Transmit AC Timing Specifications

Table 23 provides the MII transmit AC timing specifications.

Figure 8 shows the MII transmit AC timing diagram.

Figure 8. MII Transmit AC Timing Diagram

8.2.1.2

MII Receive AC Timing Specifications

Table 24 provides the MII receive AC timing specifications.

Table 23. MII Transmit AC Timing Specifications

At recommended operating conditions with LVDDA/LVDDB /NVDD of 3.3 V ± 0.3V.

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—

4.0ns

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

tMTXF

1.0—

4.0ns

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. MII Receive AC Timing Specifications

At recommended operating conditions with LVDD /NVDD of 3.3 V ± 0.3V.

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

—

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

tMRDVKH

10.0

—

TX_CLK

TXD[3:0]

tMTKHDX

tMTX

tMTXH

tMTXR

tMTXF

TX_EN

TX_ER

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