MPC8349VVAGF View Datasheet(PDF) - Freescale Semiconductor

Part Name

Description

MFG CO.

MPC8349VVAGF

PowerQUICC™ II Pro Integrated Host Processor Hardware Specifications

Freescale Semiconductor 

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Ethernet: Three-Speed Ethernet, MII Management

Figure 11 shows the MII receive AC timing diagram.

tMRX

tMRXR

RX_CLK

RXD[3:0]

RX_DV

RX_ER

tMRXH

tMRXF

Valid Data

tMRDVKH

tMRDXKH

Figure 11. MII Receive AC Timing Diagram

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 25 provides the TBI transmit AC timing specifications.

Table 25. TBI Transmit AC Timing Specifications

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

Parameter/Condition

Symbol1

Min

Typ

Max

Unit

GTX_CLK clock period

tTTX

—

8.0

—

ns

GTX_CLK duty cycle

tTTXH/tTTX

40

—

60

%

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

tTTKHDX

1.0

—

5.0

ns

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

tTTXR

—

—

1.0

ns

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

GTX_CLK125 reference clock period

tTTXF

—

—

1.0

ns

tG1252

—

8.0

—

ns

GTX_CLK125 reference clock duty cycle

tG125H/tG125

45

—

55

ns

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

MPC8349E PowerQUICC™ II Pro Integrated Host Processor Hardware Specifications, Rev. 10

26

Freescale Semiconductor

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