MPC8347E datasheet(30/108 Pages) FREESCALE

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MPC8347EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications, Rev. 3

Freescale Semiconductor

Ethernet: Three-Speed Ethernet, MII Management

8.2.3

TBI AC Timing Specifications

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

8.2.3.1

TBI Transmit AC Timing Specifications

Table 28 provides the TBI transmit AC timing specifications.

Figure 12 shows the TBI transmit AC timing diagram.

Figure 12. TBI Transmit AC Timing Diagram

Table 28. TBI Transmit AC Timing Specifications

At recommended operating conditions with LVDD / OVDD of 3.3 V ± 10%.

Parameter/Condition

Symbol 1

Min

Typ

Max

Unit

GTX_CLK clock period

tTTX

—8.0

—

GTX_CLK duty cycle

tTTXH/tTTX

—

GTX_CLK to TBI data TXD[7:0], TX_ER, TX_EN delay

tTTKHDX

1.0

—

5.0

GTX_CLK clock rise, VIL(min) to VIH(max)

tTTXR

——

1.0

GTX_CLK clock fall time, VIH(max) to VIL(min)

tTTXF

——

1.0

GTX_CLK125 reference clock period

tG125

—8.0

—

GTX_CLK125 reference clock duty cycle

tG125H/tG125

—

Notes:

1. The symbols 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, 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. In general, the clock reference symbol is based on

three letters representing the clock of a particular function. 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. This symbol represents the external GTX_CLK125 and does not follow the original symbol naming convention

GTX_CLK

TXD[7:0]

tTTX

tTTXH

tTTXR

tTTXF

tTTKHDX

TX_EN

TX_ER

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