MPC8540CPX667JC datasheet(25/104 Pages) FREESCALE

25 / 104 page

MPC8540 Integrated Processor Hardware Specifications, Rev. 4

Freescale Semiconductor

Ethernet: Three-Speed,10/100, MII Management

Figure 7 provides the AC test load for TSEC.

Figure 7. TSEC AC Test Load

Figure 8 shows the GMII receive AC timing diagram.

Figure 8. GMII Receive AC Timing Diagram

RX_CLK clock rise and fall time

tGRXR, tGRXF

2,3

——

1.0

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, tGRDVKH

symbolizes GMII receive timing (GR) with respect to the time data input signals (D) reaching the valid state (V) relative

to the tRX clock reference (K) going to the high state (H) or setup time. Also, tGRDXKL symbolizes GMII receive timing

(GR) with respect to the time data input signals (D) went invalid (X) relative to the tGRX 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 tGRX represents the GMII (G) receive

(RX) clock. For rise and fall times, the latter convention is used with the appropriate letter: R (rise) or F (fall).

2.Signal timings are measured at 0.7 V and 1.9 V voltage levels.

3.Guaranteed by design.

Table 24. GMII Receive AC Timing Specifications (continued)

At recommended operating conditions with LVDD of 3.3 V ± 5%, or LVDD=2.5V ± 5%.

Parameter/Condition

Symbol 1

Min

Typ

Max

Unit

Output

LVDD/2

RL = 50 Ω

Z0 = 50 Ω

RX_CLK

RXD[7:0]

tGRDXKH

tGRX

tGRXH

tGRXR

tGRXF

tGRDVKH

RX_DV

RX_ER

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