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3.125 Gbps Crosspoint Switch (XPS)
UT65CML8X8FD-EVB-UM Evaluation Board
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Figure 5b: Evaluation Board Test Configuration – Default XPS Connections
Configure Hardware: Connect power, SPI interface, and high-speed signal cables, as shown in Figures 1, 4, 6. The
UT65CML8X8FD-EVB can be oriented either horizontally (as shown), or vertically to facilitate test equipment setup.
This flexible orientation is facilitated by having all high-speed RX inputs on the bottom side and all high-speed TX
outputs on the top side of the EVB. See Figures 2, 3. Right angle SMA adapters are recommended for horizontal
EVB orientation. See Figure 6.
Connect NI USB-6501 USB-to-SPI Interface Device (see Figure 7) to a) Windows PC Computer via USB AB 2.0
cable, and b) EVB Master SPI port via custom interface cable (see Figures 7, 8). For correct orientation of the
connector to the header pins, the white wire is connected to VDD EXT and the black wire is connected to GND. See
Figures 1, 2, 7, 8.
Now connect and configure power supplies to the EVB. The recommended initial configuration is as follows:
VDD=VDDRX=VDDTX=1.20V and VDD_25=2.5V. Power sequencing is not critical to operation of the XPS,
however, we recommend core power (VDD) to power-up before, or simultaneously with I/O power (VDDRX,
VDDTX) and SPI port power (VDD_25).
