IXP45X datasheet(115/148 Pages) INTEL

115 / 148 page

Intel® IXP45X and Intel® IXP46X Product Line of Network Processors

August 2006

Datasheet

Document Number: 306261-004US

115

Datasheet—Intel® IXP45X and Intel® IXP46X Product Line of Network Processors

5.6.1.2

PCI Clock Timings

5.6.1.3

MII/SMII Clock Timings

Figure 16.

Typical Connection to an Oscillator

Table 49.

PCI Clock Timings

Symbol

Parameter

33 MHZ

66 MHZ

Units

Notes

Min.

Max.

Min.

Max.

TPERIODPCICLK

Clock period for PCI Clock

TCLKHIGH

PCI Clock high time

TCLKLOW

PCI Clock low time

TSLEW RATE

Slew Rate requirements for

PCI Clock

1.5

V/ns

Table 50.

MII/SMII Clock Timings

Symbol

Parameter

Min.

Nom.

Max.

Units

Notes

Tperiod100Mbit

Clock period for SMII_CLK reference

clock when operating in SMII or

Source Synchronous mode of

operation

Tperiod100Mbit

Clock period for SMII_TXCLK and

SMII_RXCLK clock when operating

in Source Synchronous SMII mode

of operation

Tperiod100Mbit

Clock period for Tx and Rx Ethernet

clocks

Tperiod10Mbit

Clock period for Tx and Rx Ethernet

clocks

400

Tduty

Duty cycle for Tx and Rx Ethernet

clocks

Frequency

Tolerance

Frequency tolerance requirement

for Tx and Rx Ethernet clocks

+/- 50

+/- 100

ppm

In te l® IX P 4 5 X / IX P 4 6 X

N e tw ork P roc es s o rs

O s c illator

OS C _ IN

OS C _ OU T

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