I have been working on the AIF 2 Generic Packet Test source code that is supplied in pdk_C6670_1_0_0_13 and I have managed to run the test successfully. I am now trying to understand the AIF 2 interface and modify this example to a different setup. What I want to achieve is to close the loopback and send a single tone sinusoidal signal via RF interface. I am kind of stuck in the middle of this process because I could not follow where the data stream is converted into IQ stream, and what kind of a signal does the DB (data buffer) expect?
Internally, in the FIFOs, the Data Buffer works with quad words, but It has a a 32-bit interface to the Protocol Encoder and Protocol Decoder. Keep in mind that the module resides in two seperate clock domains as shown in Figure 7-1 in the user's guide.
The CI and CO blocks handle much of the IQ conversion such as IQ bit interleaving/deinterleaving to and from the internal data format. Please refer to section 7.6 of the user's guide and let me know if the explanations do not suffice what you are trying to achieve.
Though I have understood what you've said and addressed, I have but one concern. How does the CPRI decides a bit in the data quad word is intended to be sent as I or Q data? In other words after the modulation how do I feed my QAM symbol to the CPRI interface?
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