MPC8378CVRALDA datasheet(30/126 Pages) FREESCALE

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MPC8378E PowerQUICC™ II Pro Processor Hardware Specifications, Rev. 2

Freescale Semiconductor

Ethernet: Enhanced Three-Speed Ethernet (eTSEC)

8.3.3

MII AC Timing Specifications

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

8.3.3.1

MII Transmit AC Timing Specifications

Table 30 provides the MII transmit AC timing specifications.

Figure 11 shows the MII transmit AC timing diagram.

Figure 11. MII Transmit AC Timing Diagram

Table 30. MII Transmit AC Timing Specifications

At recommended operating conditions with LVDD of 3.3 V ± 5%.

Parameter

Symbol 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).

Min

Typical

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:

TX_CLK

TXD[3:0]

tMTKHDX

tMTX

tMTXH

tMTXR

tMTXF

TX_EN

TX_ER

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