MPC8640DEC datasheet(35/140 Pages) FREESCALE

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MPC8640 and MPC8640D Integrated Host Processor Hardware Specifications, Rev. 1

Freescale Semiconductor

Ethernet: Enhanced Three-Speed Ethernet (eTSEC), MII Management

Figure 15 shows the MII receive AC timing diagram.

Figure 15. MII Receive AC Timing Diagram

8.2.4

TBI AC Timing Specifications

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

8.2.4.1

TBI Transmit AC Timing Specifications

Table 31 provides the TBI transmit AC timing specifications.

Table 31. TBI Transmit AC Timing Specifications

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

Parameter/Condition

Symbol 1

Min

Typ

Max

Unit

TCG[9:0] setup time GTX_CLK going high

tTTKHDV

2.0

—

TCG[9:0] hold time from GTX_CLK going high

tTTKHDX

1.0

—

GTX_CLK rise time (20%–80%)

tTTXR

——

1.0

GTX_CLK fall time (80%–20%)

tTTXF

——

1.0

Notes:

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,

tTTKHDV symbolizes the TBI transmit timing (TT) with respect to the time from tTTX (K) going high (H) until the

referenced data signals (D) reach the valid state (V) or setup time. Also, tTTKHDX symbolizes the TBI transmit timing

(TT) with respect to the time from tTTX (K) going high (H) until the referenced data signals (D) reach the invalid state

(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 tTTX represents the TBI (T) 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.

RX_CLK

RXD[3:0]

tMRDXKL

tMRX

tMRXH

tMRXR

tMRXF

RX_DV

RX_ER

tMRDVKH

Valid Data

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