Welltech SPCI2S Intel NetStructure SS7 Boards - Manual (Page 72)

SS7 Programmer’s Manual for SPCI2, SPCI4 and CPM8 Issue 2 Page 72
ref1_mode
This parameter determines whether the CT bus NETREF_1 clock is driven
onto the CT bus by this board. The permissible values are as follows:
Value NETREF_1 clock mode
0 No Change
1 Drive NETREF_1 using clock recovered from highest priority
line interface.
6 Tristate (ie Not driven)
When the NETREF_1 signal is being driven then the clock source is the highest
priority line interface. If no interface is available for clock recovery then no
signal will be driven onto the bus.
Driving the NETREF_1 signal is independent of the clk_mode and pll_clk_src
settings for this board.
ref2_mode
This parameter determines whether the CT bus NETREF_2 clock (CPM8 only)
is driven onto the CT bus by this board. The permissible values are as follows:
Value NETREF_2 clock mode
0 No Change
1 Drive NETREF_2 using clock recovered from highest priority
line interface.
6 Tristate (ie Not driven)
When the NETREF_2 signal is being driven then the clock source is the highest
priority line interface. If no interface is available for clock recovery then no
signal will be driven onto the bus.
Driving the NETREF_2 signal is independent of the clk_mode and pll_clk_src
settings for this board.