Kontron AT8050 - Manual (Page 145)

A-9 AT8050
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A.4.1.5 Base + 04h TelClock4: Backplane CLK3A/B configuration (optional)
Offset Action D7 D6 D6 D4 D3 D2 D1 D0
04h
Read 0 0 0 0 CLK3AMC CLK3FRQ CLK3BE CLK3AE
Write NU NU NU NU CLK3AMC CLK3FRQ CLK3BE CLK3AE
Reset NA NA NA NA 0 0 0 0
Name Description
CLK3AMC
Reserved for selection of the AMC that provides the clock for backplane CLK3A/B.
Applicable tot boards with two AMCs.
0: use AMC-B1
1: use AMC-B2
CLK3FRQ
Backplane CLK3A frequency.
0: copy AMC TCKLB to backplane CLK3A/B
1: copy AMC TCLKD to backplane CLK3A/B
CLK3BE Same as CLK3AE but to CLK3B
CLK3AE
Backplane CLK3A Enable.
0: don’t drive this clock
1: drive this clock
Note:
The FPGA will automatically clear bits CLK3BE and CLK3AE when the AMC is removed since the clock
source is not valid anymore.