Intel IXF1104 - Manual (Page 129)

Intel
®
IXF1104 4-Port Gigabit Ethernet Media Access Controller
129 Datasheet
Document Number: 278757
Revision Number: 009
Revision Date: 27-Oct-2005
• 43/57 duty cycle for 18 MHz operation
5.12.5 JTAG Clock
The IXF1104 MAC supports JTAG. The source of this clock must meet the following
specifications:
• 2.5 V CMOS drive
• Maximum clock frequency 11 MHz
• Maximum duty cycle distortion 40/60
5.12.6 I
2
C Clock
The IXF1104 MAC supports a single-output I
2
C clock to support all ten Optical Module interfaces.
The IXF1104 MAC 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 MAC 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