MPC8378ECVRALDA datasheet(37/126 Pages) FREESCALE

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MPC8378E PowerQUICC™ II Pro Processor Hardware Specifications, Rev. 2

Freescale Semiconductor

Ethernet: Enhanced Three-Speed Ethernet (eTSEC)

8.4.2

MII Management AC Electrical Specifications

Table 37 provides the MII management AC timing specifications.

Table 36. MII Management DC Electrical Characteristics When Powered at 3.3 V

Parameter

Conditions

Symbol

Min

Max

Unit

Supply voltage (3.3 V)

—

LVDD1

3.135

3.465

Output high voltage

IOH = –1.0 mA

LVDD1 = Min

VOH

2.10

LVDD1 +0.3

Output low voltage

IOL = 1.0 mA

LVDD1 = Min

VOL

GND

0.50

Input high voltage

—

VIH

2.00

—

Input low voltage

—

VIL

—0.80

Input high current

LVDD1 = Max

VIN

1 = 2.1 V

IIH

—30

μA

Input low current

LVDD1 = Max

VIN = 0.5 V

IIL

–600

—

μA

Table 37. MII Management AC Timing Specifications

Parameter

Symbol1

Min

Typical

Max

Unit

Notes

MDC frequency

fMDC

2.5

—

8.3

MHz

2, 3

MDC period

tMDC

—

400

—

MDC clock pulse width high

tMDCH

—

MDC to MDIO valid

tMDKHDV

× (tplb_clk × 8)

—

MDC to MDIO delay

tMDKHDX

—

× (tplb_clk × 8)

3, 5

MDIO to MDC setup time

tMDDVKH

5—

—

MDIO to MDC hold time

tMDDXKH

0—

—

MDC rise time

tMDCR

——

MDC fall time

tMDCF

——

Note:

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, tMDKHDX symbolizes

management data timing (MD) for the time tMDC from clock reference (K) high (H) until data outputs (D) are invalid (X) or data

hold time. Also, tMDDVKH symbolizes management data timing (MD) with respect to the time data input signals (D) reach the

valid state (V) relative to the tMDC clock reference (K) going to the high (H) state or setup time. For rise and fall times, the

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

2 This parameter is dependent on the system clock speed. (The maximum frequency is the maximum platform frequency

divided by 64.)

3 This parameter is dependent on the system clock speed. (That is, for a system clock of 267 MHz, the maximum frequency

is 8.3 MHz and the minimum frequency is 1.2 MHz; for a system clock of 375 MHz, the maximum frequency is 11.7 MHz and

the minimum frequency is 1.7 MHz.)

4 Guaranteed by design.

5 t

plb_clk is the platform (CSB) clock divided according to the SCCR[TSEC1CM].

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