Changes between Version 1 and Version 2 of HardwareUsersGuides/FMC-RF-2X245/MGTs


Ignore:
Timestamp:
Dec 12, 2012, 12:09:12 PM (11 years ago)
Author:
murphpo
Comment:

--

Legend:

Unmodified
Added
Removed
Modified

  • HardwareUsersGuides/FMC-RF-2X245/MGTs

    v1 v2  
    2626
    2727== Clocking ==
     28
     29The FMC standard requires FMC modules which use the DP signals also provide the reference clock for the FPGA transceivers. There are two dedicated differential clocks on the FMC header for these signals, labeled GBTCLK0_M2C and GBTCLK1_M2C.
     30
     31'''GBTCLK0_M2C''': the FMC-RF-2X245 module has an LVDS oscillator tied to GBTCLK0_M2C. Modules are currently assembled with a 156.25MHz oscillator.
     32
     33'''GBTCLK1_M2C''': the FMC-RF-2X245 module connects this clock signal to MMCX jacks (one each for +/-). This allows an external clock source to be used as the MGT reference clock. By default the MMCX connectors are not mounted but can be added at J4/J5 if needed.