In the tsw4100 eval board there is an altera fpga that among other enables ddc/duc programable sync.
Taking out 5016 and altera registers configutration interface, The questions are:
1. is this sync design a must, or connecting ddc sync out to duc sync in and internal sync configuration will work ?
2. why port ddc port c and d are routed through altera ? with 2+ clock delay ?
3. is there a special reason why ddc port ab are connected to duc port cd and ddc port cd are connected to duc port ab ?
The GC5016 has a 2 channel and a 4 channel mode.
The 2 channel mode is called splitIQ, and used 2 DDC/DUC blocks per channel for more PFIR filtering.
The IO interface in this mode is either real I and realQ from DDC to DUC, or TDM interleaved QB,IB,QA,IA(the TDM is not supported in the current FPGA)
The 4 channel mode has different IO interface.
Interleaved I then Q, or TDM interleaved QD,ID,QC,IC,QB,IB,QA,IA (the TDM is not supported in the current FPGA)
1) If the customer follows the recommended IO interface for the GC5016 from the IO Application Note, the special Sync design is not needed.
2) in the splitIQ mode, we would register the parallel I and Q output from the DDC to a register. We would then transfer that register to the FPGA output register for the DUC.
2 sets of registers.
3) The TDM mode DDC is from portD, the TDM mode to the DUC is for portA. CD(DDC) is connected to AB(DUC) to allow for future expansion using TDM
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.