MPC8347E datasheet(29/108 Pages) FREESCALE

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MPC8347EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications, Rev. 3

Freescale Semiconductor

Ethernet: Three-Speed Ethernet, MII Management

8.2.2.2

MII Receive AC Timing Specifications

Table 27 provides the MII receive AC timing specifications.

Figure 10 provides the AC test load for TSEC.

Figure 10. TSEC AC Test Load

Figure 11 shows the MII receive AC timing diagram.

Figure 11. MII Receive AC Timing Diagram

Table 27. MII Receive AC Timing Specifications

At recommended operating conditions with LVDD / OVDD of 3.3 V ± 10%.

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 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. In general, the clock

reference symbol is based on three letters representing the clock of a particular functionl. 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 Ω

LVDD/2

RL = 50 Ω

RX_CLK

RXD[3:0]

tMRDXKH

tMRX

tMRXH

tMRXR

tMRXF

RX_DV

RX_ER

tMRDVKH

Valid Data

MPC8347E Datasheet(PDF) 29 Page - Freescale Semiconductor, Inc

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