MPC8544E datasheet(35/117 Pages) FREESCALE

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MPC8544E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 5

Freescale Semiconductor

Enhanced Three-Speed Ethernet (eTSEC), MII Management

Figure 17 provides the AC test load for eTSEC.

Figure 17. eTSEC AC Test Load

Figure 18 shows the MII receive AC timing diagram.

Figure 18. MII Receive AC Timing Diagram

8.7

TBI AC Timing Specifications

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

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

tMRDVKH

10.0

—

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

tMRDXKH

10.0

—

RX_CLK clock rise (20%–80%)

tMRXR

1.0

—

4.0

—

RX_CLK clock fall time (80%–20%)

tMRXF

1.0

—

4.0

—

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, tMRDVKH symbolizes MII receive

timing (MR) with respect to the time data input signals (D) reach the valid state (V) relative to the tMRX clock reference (K)

going to the high (H) state or setup time. Also, tMRDXKL symbolizes MII receive timing (GR) with respect to the time data input

signals (D) went invalid (X) relative to the tMRX clock reference (K) going to the low (L) state or hold time. Note that, in general,

the clock reference symbol representation is based on three letters representing the clock of a particular functional. For

example, the subscript of tMRX represents the MII (M) receive (RX) clock. For rise and fall times, the latter convention is used

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

Table 33. MII Receive AC Timing Specifications (continued)

At recommended operating conditions with L/TVDD of 3.3 V ± 5%.or 2.5 V ± 5%.

Parameter/Condition

Symbol1

Min

Typ

Max

Unit

Notes

Output

Z0 = 50 Ω

LVDD/2

RL = 50 Ω

RX_CLK

RXD[3:0]

tMRDXKL

tMRX

tMRXH

tMRXR

tMRXF

RX_DV

RX_ER

tMRDVKH

Valid Data

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