MPC8309EC datasheet(25/82 Pages) FREESCALE

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MPC8309 PowerQUICC II Pro Integrated Communications Processor Family Hardware Specifications, Rev. 0

Freescale Semiconductor

Ethernet and MII Management

Figure 14 provides the AC test load.

Figure 11. AC Test Load

Figure 12 shows the MII transmit AC timing diagram.

Figure 12. MII Transmit AC Timing Diagram

8.2.1.2

MII Receive AC Timing Specifications

Table 21 provides the MII receive AC timing specifications.

Table 21. MII Receive AC Timing Specifications

At recommended operating conditions with OVDD of 3.3 V ± 300mV.

Parameter/Condition

Symbol1

Min

Typical

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 VIL(min) to VIH(max)

tMRXR

1.0

—

4.0

RX_CLK clock fall time VIH(max) to VIL(min)

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).

Output

Z0 = 50 

OVDD/2

RL = 50 

TX_CLK

TXD[3:0]

tMTKHDX

tMTX

tMTXH

tMTXR

tMTXF

TX_EN

TX_ER

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