Artesyn COMX-P4080 Installation and Use (August 2014) - Manual (Page 59)

Functional Description
COMX-P4080 COM Express Module Installation and Use (6806800L20C) 59
4.5 Clock Distribution
The COMX-P4080 needs several kinds of single-ended and different clocks for booting up and
normal operation. The clock distribution list is illustrated below.
The frequency of the three SerDes banks’ reference clocks can be set from 100 MHz to 125
MHz using the S1 switch.
Figure 4-5 COMX-P4080 Clock Distribution
Table 4-2 SerDes Clock Configuration by S1 Switch
SerDes Bank 1 Reference Clock SerDes Bank 2 Reference Clock SerDes Bank 3 Reference Clock
S1.2=ON, 125MHz S1.3=ON, 100MHz S1.4=ON, 100MHz
S1.2=OFF, 100MHz S1.3=OFF, 125MHz S1.4=OFF, 125MHz
Default:100MHz Default:125MHz Default:125MHz