Sundance SMT399-160 - Manual (Page 12)

Figure 5 - Multi module synchronisation connectors.
4.9 Dual-tone Mode.
The SMT399-160 can used as a dual-tone generator. Both DDS outputs can be mixed
together. In this case, all four analog outputs (J13, J14, J15 and J20) would show the same
signal, at relevant amplitudes.
To configure the SMT399-160 into the dual-tone mode, simply fit J16, J17, J18 and J19 in
place.
The normal mode of operation is obtained by leaving J16, J17, J18 and J19 open.
Figure 6 - Dual-Tone Mode.
4.10 External Trigger.
Two external triggers are available on J23 and J11. Both are straight through, i.e. the
connector is directly connected to the FPGA. There is no protection so it is to the user to
make sure levels present on the connector are compatible with the pad implemented in the
FPGA. In the default firmware provided, J23 is connected to LED1 and J11 to LED3 (see
silkscreen for LED locations).
User Manual SMT399-160 Page 12 of 39 Last Edited: 24/05/2007 17:12:00