The FMC12x User Manual pg. 7 (October 2012) states: [i]"The FMC122/FMC125 has a 1:2 DMUX feature. In 1:2 DMUX mode eight 8-bit LVDS busses run at a maximum of 625Mbps each. The FMC126 does not offer a DMUX mode and has four 10-bit busses running at a maximum of 1.25Gbps each." [/i]and: [i]"It should be noted that successful implementation of LVDS connections running at 1.25Gbps (FMC126) highly depends on carrier board design and layout." [/i] Also, I see DMUX_MODE generic in ev8aq160_quad_phy.vhd, which leads me to ask: 1) Does the FMC125 support 1:1 DMUX mode? If not, why? 2) Does the ML605 support the LVDS 1.25Gbps that the 1:1 DMUX mode requires? I would think it would have to, since the ML605 is compatible with the FMC126 which only runs at 1:1 DMUX mode/LVDS 1.25 Gbps. If that's the case, why doesn't the FMC125 run in 1:1 DMUX mode? 3) If so, to enable it, is it as simple as changing the DMUX_MODE generic to 1?
Thanks in advance.
about 3 years ago
For the hardware point of view, FMC125 supports the 1:1 DMUX mode. Because of the FPGA speed, we generated the firwmare for 1:2 DMUX mode. 1:1 DMUX mode for FMc125 is not tested recently. It should work, but I cannot confirm it. In order to use it, DMUX mode and clock constraints in the firmware and clock/adc settings in the software needs to be updated.