MPC8560CPXAPDB datasheet(27/108 Pages) FREESCALE

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MPC8560 Integrated Processor Hardware Specifications, Rev. 3.1

Freescale Semiconductor

Ethernet: Three-Speed, MII Management

Figure 7 shows the GMII transmit AC timing diagram.

Figure 7. GMII Transmit AC Timing Diagram

7.2.1.2 GMII Receive AC Timing Specifications

Table 21 provides the GMII receive AC timing specifications.

GTX_CLK data clock fall time (80%-20%)

tGTXF

—

1.0

Notes:

1. The symbols used for timing specifications herein follow the pattern 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,

tGTKHDV symbolizes GMII transmit timing (GT) with respect to the tGTX clock reference (K) going to the high state

(H) relative to the time date input signals (D) reaching the valid state (V) to state or setup time. Also, tGTKHDX

symbolizes GMII transmit timing (GT) with respect to the tGTX clock reference (K) going to the high state (H) relative

to the time date input signals (D) going invalid (X) 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 tGTX represents the GMII(G) transmit (TX) 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 21. GMII Receive AC Timing Specifications

At recommended operating conditions with LVDD of 3.3 V ± 5%.

Parameter/Condition

Symbol 1

Min

Typ

Max

Unit

Input low voltage

VIL

—

0.7

Input high voltage

VIH

1.9

—

RX_CLK clock period

tGRX

—

8.0

—

RX_CLK duty cycle

tGRXH/tGRX

—

RXD[7:0], RX_DV, RX_ER setup time to RX_CLK

tGRDVKH

2.0

—

RXD[7:0], RX_DV, RX_ER hold time to RX_CLK

tGRDXKH

0.5

—

RX_CLK clock rise (20%-80%)

tGRXR

—

1.0

Table 20. GMII Transmit AC Timing Specifications (continued)

At recommended operating conditions with LVDD of 3.3 V ± 5%.

Parameter/Condition

Symbol 1

Min

Typ

Max

Unit

GTX_CLK

TXD[7:0]

tGTKHDX

tGTX

tGTXH

tGTXR

tGTXF

tGTKHDV

TX_EN

TX_ER

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