PPC8567CVTAQGGA datasheet(32/139 Pages) FREESCALE

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MPC8568E/MPC8567E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 1

Freescale Semiconductor

Ethernet Interface and MII Management

Figure 10 provides the AC test load for eTSEC.

Figure 10. eTSEC AC Test Load

Figure 11 shows the GMII receive AC timing diagram.

Figure 11. GMII Receive AC Timing Diagram

8.2.3

MII AC Timing Specifications

This section describes the MII transmit and receive AC timing specifications.

RX_CLK clock fall time (80%-20%)

tGRXF

—1.0

2.0

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. Guaranteed by design

Table 28. GMII Receive AC Timing Specifications (continued)

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