MPC8377E datasheet(15/127 Pages) FREESCALE

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MPC8377E PowerQUICC II Pro Processor Hardware Specifications, Rev. 8

Freescale Semiconductor

4.3

eTSEC Gigabit Reference Clock Timing

This table provides the eTSEC gigabit reference clocks (EC_GTX_CLK125) AC timing specifications.

RESET Initialization

This section describes the DC and AC electrical specifications for the reset initialization timing and

electrical requirements of the chip.

5.1

RESET DC Electrical Characteristics

This table provides the DC electrical characteristics for the RESET pins of the device.

Table 9. EC_GTX_CLK125 AC Timing Specifications

At recommended operating conditions with LVDD = 2.5 ± 0.125 mV/ 3.3 V ± 165 mV

Parameter/Condition

Symbol

Min

Typical

Max

Unit

Note

EC_GTX_CLK125 frequency

tG125

—

125

—

MHz

—

EC_GTX_CLK125 cycle time

tG125

—8

—

EC_GTX_CLK rise and fall time

LVDD = 2.5 V

LVDD = 3.3 V

tG125R/tG125F

——

0.75

1.0

EC_GTX_CLK125 duty cycle

1000Base-T for RGMII, RTBI

tG125H/tG125

—

EC_GTX_CLK125 jitter

—

±150

Notes:

1. Rise and fall times for EC_GTX_CLK125 are measured from 0.5 and 2.0 V for LVDD = 2.5 V and from 0.6 and 2.7 V for

LVDD =3.3 V.

2. EC_GTX_CLK125 is used to generate the GTX clock for the eTSEC transmitter with 2% degradation. The

EC_GTX_CLK125 duty cycle can be loosened from 47%/ 53% as long as the PHY device can tolerate the duty cycle

generated by the eTSEC GTX_CLK. See Section 8.2.2, “RGMII and RTBI AC Timing Specifications,” for the duty cycle for

10Base-T and 100Base-T reference clock.

Table 10. RESET Pins DC Electrical Characteristics

Characteristic

Symbol

Condition

Min

Max

Unit

Input high voltage

VIH

—2.0

OVDD + 0.3

Input low voltage

VIL

—

–0.3

0.8

Input current

IIN

——

± 30

μA

Output high voltage

VOH

IOH = –8.0 mA

2.4

—

Output low voltage

VOL

IOL = 8.0 mA

—

0.5

Output low voltage

VOL

IOL = 3.2 mA

—

0.4

Notes:

• This table applies for pins PORESET and HRESET. The PORESET is input pin, thus stated output voltages are not relevant.

• HRESET and SRESET are open drain pin, thus VOH is not relevant for these pins.

MPC8377E Datasheet(PDF) 15 Page - Freescale Semiconductor, Inc

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