MPC8544E datasheet(37/117 Pages) FREESCALE

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MPC8544E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 5

Freescale Semiconductor

Enhanced Three-Speed Ethernet (eTSEC), MII Management

Figure 20 shows the TBI receive AC timing diagram.

Figure 20. TBI Receive AC Timing Diagram

8.7.3

TBI Single-Clock Mode AC Specifications

When the eTSEC is configured for TBI modes, all clocks are supplied from external sources to the relevant

eTSEC interface. In single-clock TBI mode, when TBICON[CLKSEL] = 1, a 125-MHz TBI receive clock

is supplied on the TSECn_RX_CLK pin (no receive clock is used on TSECn_TX_CLK in this mode,

whereas for the dual-clock mode this is the PMA1 receive clock). The 125-MHz transmit clock is applied

on the TSEC_GTX_CLK125 pin in all TBI modes.

PMA_RX_CLK[0:1] duty cycle

tTRXH/tTRX

—

RCG[9:0] setup time to rising PMA_RX_CLK

tTRDVKH

2.5

—

PMA_RX_CLK to RCG[9:0] hold time

tTRDXKH

1.5

—

PMA_RX_CLK[0:1] clock rise time (20%-80%)

tTRXR

0.7

—

2.4

—

PMA_RX_CLK[0:1] clock fall time (80%-20%)

tTRXF

0.7

—

2.4

—

Note:

1. The symbols used for timing specifications 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, tTRDVKH symbolizes TBI receive

timing (TR) with respect to the time data input signals (D) reach the valid state (V) relative to the tTRX clock reference (K)

going to the high (H) state or setup time. Also, tTRDXKH symbolizes TBI receive timing (TR) with respect to the time data input

signals (D) went invalid (X) relative to the tTRX clock reference (K) going to the high (H) state. 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 tTRX represents the TBI (T) receive (RX) clock. For rise and fall times, the latter convention is used with the

appropriate letter: R (rise) or F (fall). For symbols representing skews, the subscript is skew (SK) followed by the clock that

is being skewed (TRX).

Table 35. TBI Receive AC Timing Specifications (continued)

At recommended operating conditions with L/TVDD of 3.3 V ± 5% or 2.5 V ± 5%.

Parameter/Condition

Symbol1

Min

Typ

Max

Unit

Notes

PMA_RX_CLK1

RCG[9:0]

tTRX

tTRXH

tTRXR

tTRXF

tTRDVKH

PMA_RX_CLK0

tTRDXKH

tTRDVKH

tTRDXKH

tSKTRX

tTRXH

Valid Data

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