MPC8548ECHXATHA datasheet(35/151 Pages) FREESCALE

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MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 9

Freescale Semiconductor

Enhanced Three-Speed Ethernet (eTSEC)

Figure 14 shows the TBI transmit AC timing diagram.

Figure 14. TBI Transmit AC Timing Diagram

8.2.4.2

TBI Receive AC Timing Specifications

This table provides the TBI receive AC timing specifications.

Table 31. TBI Receive AC Timing Specifications

Parameter/Condition

Symbol1

Min

Typ

Max

Unit

TSECn_RX_CLK[0:1] clock period

tTRX

—

16.0

—

TSECn_RX_CLK[0:1] skew

tSKTRX

7.5

—

8.5

TSECn_RX_CLK[0:1] duty cycle

tTRXH/tTRX

—

RCG[9:0] setup time to rising TSECn_RX_CLK

tTRDVKH

2.5

—

RCG[9:0] hold time to rising TSECn_RX_CLK

tTRDXKH

1.5

—

TSECn_RX_CLK[0:1] clock rise time (20%–80%)

tTRXR

0.7

—

2.4

TSECn_RX_CLK[0:1] clock fall time (80%–20%)

tTRXF

0.7

—

2.4

Notes:

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).

2. Guaranteed by design.

GTX_CLK

TCG[9:0]

tTTXR

tTTX

tTTXH

tTTXR

tTTXF

tTTKHDV

tTTKHDX

tTTXF

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