CPRI Intel® FPGA IP User Guide

ID 683595
Date 10/07/2022

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Document Table of Contents Specifying the Control Word

Figure 56. Subchannels in a HyperframeIllustrates how the 256 control words in the hyperframe are organized as 64 subchannels of four control words each. The figure illustrates why the index X of a control word is Ns + 64 * Xs, where Ns is the subchannel index and Xs is the index of the control word within the subchannel.

The rx_ctrl_x and tx_ctrl_x fields of the CTRL_INDEX register hold the X value of the control word you want to access through the control and status interface.