6
ispClock5400D Evaluation Board
Lattice Semiconductor
User’s Guide
9.
If the board is not programmed with the demo project yet, press the
Download
icon on the top toolbar.
Figure 4. PAC-Designer Top Toolbar
The Frequency Summary dialog appears and reports the Reference and VCO frequency settings.
Figure 5. Frequency Summary Dialog Box
10. Click
OK
.
PAC-Designer reprograms the evaluation board with the updated JEDEC programming file.
11. Attach high-speed scope leads to the SMA sockets at BANK0 P, N and BANK2 P, N.
12. Set the scope input channel settings to
50 Ohm termination
.
For this mode, we use LVDS and the 50 Ohm termination on each scope channel.
The waveforms shown are using 3’ long RG-316 cables with the SMA connectors. If the equipment has high
impedance probes or a differential probe, make sure that the LVDS BANK outputs have 100 Ohm termination
from BANK_P to BANK_N.
When operating properly, you should see four waveforms on the scope as shown in Figure 6. This represents
BANK0 and BANK2 output waveforms for both the BANK_P and BANK_N on each respectively. BANK0_P,N
are shown on the top pair, BANK2_P,N are shown on bottom pair. The full differential output would equal:
[BANK0_P minus BANK0_N] as well as on BANK2.
See the tables in the schematic (Appendix A) showing termination resistor options.
