SMT370

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I saw that a 50 MHz oscillator is connected to the FPGA on the SMT370. Does that mean that the system clock of the FPGA is 50 MHz?

The 50MHz crystal is indeed used to clock the internal logic in the FPGA, for Comports and serial interfaces.


The FPGA is able to read data from the ZBTRAM and send them to the DAC with a frequency of 160 MHz. Am I right?

The ZBTRAM memory uses the DAC sampling frequency. It varies from 30 to 160 MHz.


Are the SHBs on the SMT370 normal?

The SHB interface implemented in the SMT370 a simplified version of the standard. - SHBA is output only and SHBB is input only, it therefore takes the incoming SHB clock. SHBA uses the ADC sampling clock to avoid internal synchronisation problems. It therefore varies from 30 to 105 MHz and remains compatible with Sundance SHB interface implemented in DSP modules. - There is internal FIFO to re-synchronise incoming SHBB data to the DAC sampling clock (1:2 buffer sends the clock to the DAC and to the FPGA so both are synchronised). See Figure 14 - Clock Routing in current User Manual (http://www.sundance.com/docs/SMT370%20User%20Manual.pdf ).


How do I know the firmware version implemented in the FPGA of the SMT370?

The SMT370 displays on the LEDs a code after a reset and when the registers are still not configured. This code represents the firmware version implemented in the FPGA. The current version of the FPGA firmware displays the following

Led0 | Led1 | Led2 | Led3 OFF OFF ON ON Previous


I purchased two SMT506-BNC cables to feed analog signals to the inputs of the ADCs of SMT370 as you recommended. Since the inputs of the ADCs of SMT370 are male type, we need a female type MMBX connector. However, the MMBX connector of the cable we purchased is a male type. Shold we purchase a MMBX male-to-female adaptor or is there a MMBX(female type)-BNC cable available?

You did purchase the correct part number for the MMBX-BNC cable: SMT506-BNC.

I think that you have on the SMT370 module the analogue PCB connector. This connector has to be removed very carefully because of the 4 little adaptor bits from the connector. If you remove these 4 little adaptor bits (with a small pliers/tweezers if needed), you should be able to connect the SMT506-BNC cable.