PPC8567CVTAQGGA datasheet(35/139 Pages) FREESCALE

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MPC8568E/MPC8567E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 1

Freescale Semiconductor

Ethernet Interface and MII Management

8.2.4.1

TBI Transmit AC Timing Specifications

Table 31 provides the TBI transmit AC timing specifications.

Figure 15 shows the TBI transmit AC timing diagram.

Figure 15. TBI Transmit AC Timing Diagram

Table 31. TBI Transmit AC Timing Specifications

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

Parameter/Condition

Symbol 1

Min

Typ

Max

Unit

GTX_CLK clock period

tTTX

—8.0

—

GTX_CLK duty cycle

tTTXH/tTTX

—

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 (20%–80%)

tTTXR

—1.0

2.0

GTX_CLK fall time (80%–20%)

tTTXF

—1.0

2.0

EC_GTX_CLK125 clock rise time (20%-80%)

tG125R

—1.0

2.0

EC_GTX_CLK125 clock fall time (80%-20%)

tG125F

—1.0

2.0

EC_GTX_CLK125 duty cycle

tG125H/tG125

—

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.

GTX_CLK

TCG[9:0]

tTTXR

tTTX

tTTXH

tTTXR

tTTXF

tTTKHDV

tTTKHDX

tTTXF

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