MPC8308 datasheet(17/90 Pages) FREESCALE

17 / 90 page

MPC8308 PowerQUICC II Pro Processor Hardware Specification, Rev. 2

Freescale Semiconductor

Ethernet: Three-Speed Ethernet, MII Management

8.2

MII and RGMII AC Timing Specifications

The AC timing specifications for MII and RGMII are presented in this section.

8.2.1

MII AC Timing Specifications

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

8.2.1.1

MII Transmit AC Timing Specifications

Table 23 provides the MII transmit AC timing specifications.

Table 22. RGMII DC Electrical Characteristics

Parameters

Symbol

Conditions

Min

Max

Unit

Supply voltage 2.5 V

LVDD

—

2.37

2.63

Output high voltage

VOH

IOH = –1.0 mA

LVDD = Min

2.00

LVDD + 0.3

Output low voltage

VOL

IOL = 1.0 mA

LVDD= Min

VSS – 0.3

0.40

Input high voltage

VIH

—LVDD = Min

1.7

LVDD + 0.3

Input low voltage

VIL

—LVDD = Min

–0.3

0.70

Input high current

IIH

VIN

1 = LV

—15

μA

Input low current

IIL

VIN

1 = VSS

–15

—

μA

Note:

1. Note that the symbol VIN, in this case, represents the LVIN symbol referenced in Table 1 and Table 2.

Table 23. MII Transmit AC Timing Specifications

At recommended operating conditions with LVDDA/LVDDB /NVDD of 3.3 V ± 0.3V.

Parameter/Condition

Symbol 1

Min

Typ

Max

Unit

TX_CLK clock period 10 Mbps

tMTX

—400

—

TX_CLK clock period 100 Mbps

tMTX

—40

—

TX_CLK duty cycle

tMTXH/tMTX

—

TX_CLK to MII data TXD[3:0], TX_ER, TX_EN delay

tMTKHDX

TX_CLK data clock rise VIL(min) to VIH(max)

tMTXR

1.0—

4.0ns

TX_CLK data clock fall VIH(max) to VIL(min)

tMTXF

1.0—

4.0ns

Note:

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, tMTKHDX symbolizes MII transmit

timing (MT) for the time tMTX clock reference (K) going high (H) until data outputs (D) are invalid (X). Note that, in general,

the clock reference symbol representation is based on two to three letters representing the clock of a particular functional.

For example, the subscript of tMTX represents the MII(M) transmit (TX) clock. For rise and fall times, the latter convention is

used with the appropriate letter: R (rise) or F (fall).

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