Example Usage - UG1433

The software commands are documented in Command List. The commands can be entered into the Command log window of the RF Evaluation tool GUI ( RF Data Converter Interface User Guide (UG1309). The following examples show the command sequences for DAC and ADC, respectively.

DAC Example

1. Write 1 into the DAC/ADC TDD mode pin register.
   • SetTDDRTSPinCtrl 1 0x0001 enables the TDD on DAC tile 0 channel 0.
   • SetTDDRTDPinCtrl DAC/ADC Channel_mask to 1 for DAC and 0 for ADC. Channel mask bit 0 = DAC0, bit 1 DAC1, etc.
2. Write the symbol length, guard band length, and symbol type registers.
   • SetTDDRTSSlot 0 1000 0x01f: guard band 0, symbol length 1000, half DL, half UL.
3. At this stage, the channels selected in step 1 are operating in TDD mode.
4. An immediate trigger can be issued.
5. To stop the TDD RTS pin assertion/deassertion, SetTDDRTSPinCtrl 10x0000

The following figure shows a representation of the frames in the DAC example.

Dual ADC Example

1. Write the symbol length, guard band length, and symbol type registers.
   • SetTDDRTSSlot 0 1000 0x01f: guard band 0, symbol length 1000, half DL, half UL.
2. Write 1 into the ADC TDD mode pin register.
   • SetTDDRTSPinCtrl 0 0x0030 enables the TDD on ADC tile 1 channel 0 for dual ADC.
   • As the ADC is a dual ADC, the two TDD RTS pins need to be driven High.
3. At this stage, the channels selected in step 1 are operating in TDD mode.
4. To set up an ADC trigger on a specific frame and symbol:
   • Write symbol and frame trigger registers.
     • SetTDDRTSTrigSlot 5 5.
     • SetTDDRTSTrigSlot symbol frame.
   • Write 1 in the corresponding bit of the enable register.
     • SetTDDRTSEnables 0x0002.
     • This controls the hw_trigger_en pins. In this example, it enables the trigger on tile 1.
   • Write 1 in the trigger register.
     • SetTDDRTSTrig 1.
     • This controls the hw_trigger pins.