MPC8572ECLPXATLD datasheet(39/140 Pages) FREESCALE

39 / 140 page

MPC8572E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 4

Freescale Semiconductor

Ethernet: Enhanced Three-Speed Ethernet (eTSEC)

Figure 17 shows the TBI receive the timing diagram.

Figure 17. TBI Single-Clock Mode Receive AC Timing Diagram

8.2.6

RGMII and RTBI AC Timing Specifications

Table 33 presents the RGMII and RTBI AC timing specifications.

Table 33. RGMII and RTBI AC Timing Specifications

At recommended operating conditions with LVDD/TVDD of 2.5 V ± 5%.

Parameter/Condition

Symbol 1

Min

Typ

Max

Unit

Data to clock output skew (at transmitter)

tSKRGT

–500

500

Data to clock input skew (at receiver) 2

tSKRGT

1.0

—

2.8

Clock period 3

tRGT

7.2

8.0

8.8

Duty cycle for 10BASE-T and 100BASE-TX 3, 4

tRGTH/tRGT

Rise time (20%–80%)

tRGTR

—

0.75

Fall time (20%–80%)

tRGTF

—

0.75

Notes:

1. Note that, in general, the clock reference symbol representation for this section is based on the symbols RGT to represent

RGMII and RTBI timing. For example, the subscript of tRGT represents the TBI (T) receive (RX) clock. Note also that the

notation for rise (R) and fall (F) times follows the clock symbol that is being represented. For symbols representing skews, the

subscript is skew (SK) followed by the clock that is being skewed (RGT).

2. This implies that PC board design requires clocks to be routed such that an additional trace delay of greater than 1.5 ns will

be added to the associated clock signal.

3. For 10 and 100 Mbps, tRGT scales to 400 ns ± 40 ns and 40 ns ± 4 ns, respectively.

4. Duty cycle may be stretched/shrunk during speed changes or while transitioning to a received packet's clock domains as long

as the minimum duty cycle is not violated and stretching occurs for no more than three tRGT of the lowest speed transitioned

between.

tTRR

tTRRH

tTRRF

tTRRR

RX_CLK

RCG[9:0]

valid data

tTRRDX

tTRRDV

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