MPC8314EVRADDA datasheet(25/101 Pages) FREESCALE

25 / 101 page

MPC8314E PowerQUICC II Pro Processor Hardware Specifications, Rev. 2

Freescale Semiconductor

Ethernet: Three-Speed Ethernet, MII Management

9.2.1.2

MII Receive AC Timing Specifications

This table provides the MII receive AC timing specifications.

This figure provides the AC test load for eTSEC.

Figure 10. eTSEC AC Test Load

This figure shows the MII receive AC timing diagram.

Figure 11. MII Receive AC Timing Diagram RMII AC Timing Specifications

Table 26. MII Receive AC Timing Specifications

At recommended operating conditions with LVDD of 3.3 V ± 300 mv

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

—

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 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, 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. The frequency of RX_CLK should not exceed the TX_CLK by more than 300 ppm

Output

Z0 = 50 

LVDD/2

RL = 50 

RX_CLK

RXD[3:0]

tMRDXKH

tMRX

tMRXH

tMRXR

tMRXF

RX_DV

RX_ER

tMRDVKH

Valid Data

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