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IXF1104 Quad-Port 10/100/1000 Mbps Ethernet Media Access Controller
128 Datasheet
Document Number: 278757
Revision Number: 007
Revision Date: March 25, 2004
• 43/57 duty cycle for 18 MHz operation
5.12.5 JTAG Clock
The IXF1104 supports JTAG. The source of this clock must meet the following specifications:
• 3.3 V CMOS drive
• Maximum clock frequency 11 MHz
• Maximum duty cycle distortion 40/60
5.12.6 I
2
C Clock
The IXF1104 supports a single-output I
2
C clock to support all ten Optical Module interfaces. The
IXF1104 meets the following specifications for this clock:
• 2.5 V CMOS drive
• Maximum clock frequency of 100 KHz
5.12.7 LED Clock
The IXF1104 supports a serial LED data stream and meets the following specifications for this
clock:
• 2.5 V CMOS drive
• Maximum frequency of 720 Hz
• Maximum duty cycle distortion 50/50