MPC8640DEC datasheet(34/140 Pages) FREESCALE

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MPC8640 and MPC8640D Integrated Host Processor Hardware Specifications, Rev. 1

Freescale Semiconductor

Ethernet: Enhanced Three-Speed Ethernet (eTSEC), MII Management

Figure 13. MII Transmit AC Timing Diagram

8.2.3.2

MII Receive AC Timing Specifications

Table 30 provides the MII receive AC timing specifications.

Figure 14 provides the AC test load for eTSEC.

Figure 14. eTSEC AC Test Load

Table 30. MII Receive AC Timing Specifications

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

Parameter/Condition

Symbol 1

Min

Typ

Max

Unit

RX_CLK clock period 10 Mbps

tMRX

2,3

—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 time (20%-80%)

tMRXR

1.0—

4.0ns

RX_CLK clock fall time (80%-20%)

tMRXF

1.0—

4.0ns

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. Guaranteed by design.

3. ±100 ppm tolerance on RX_CLK frequency

TX_CLK

TXD[3:0]

tMTKHDX

tMTX

tMTXH

tMTXR

tMTXF

TX_EN

TX_ER

Output

Z0 = 50 Ω

LVDD/2

RL = 50 Ω

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