MPC8548ECHXATHA datasheet(33/151 Pages) FREESCALE

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MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 9

Freescale Semiconductor

Enhanced Three-Speed Ethernet (eTSEC)

Figure 11 shows the MII transmit AC timing diagram.

Figure 11. MII Transmit AC Timing Diagram

8.2.3.2

MII Receive AC Timing Specifications

This table provides the MII receive AC timing specifications.

Figure 12 provides the AC test load for eTSEC.

Figure 12. eTSEC AC Test Load

Table 29. MII Receive AC Timing Specifications

Parameter/Condition

Symbol1

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

—

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

Notes:

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).

2. Guaranteed by design.

TX_CLK

TXD[3:0]

tMTKHDX

tMTX

tMTXH

tMTXR

tMTXF

TX_EN

TX_ER

Output

Z0 = 50 

LVDD/2

RL = 50 

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