Do I need to instantiate ALTGX_RECONFIG when using transceiver blocks in Arria II GX, Stratix IV GX devices? If you design with ALTGXB alone, a compilation error will occur.

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Do I need to instantiate ALTGX_RECONFIG when using transceiver blocks in Arria II GX and Stratix IV GX devices? If you design with ALTGXB alone, a compilation error will occur.

Yes it is.

Dynamic reconfiguration of the transceiver block is typically the ability to change receive analog settings, CMUPLL settings, dynamic data rate changes, and other functional changes without reconfiguring the entire FPGA. In addition, the Arria II GX and Stratix IV GX series have added a function called offset cancellation.

This function corrects process fluctuations in the reception buffer and CDR when the power is turned on, correcting the process fluctuations in reception characteristics and enabling more stable reception of data.

This feature called offset cancellation is enabled by implementing ALTGX_RECONFIG. This is for ALTGX blocks that contain receive blocks. So, strictly speaking, if only the transmit block is configured with ALTGX, there is no need to implement ALTGX_RECONFIG.

For details, please refer to the document at the following URL.
・ http://www.altera.co.jp/literature/hb/arria-ii-gx/aiigx_52001.pdf
Search by keyword “Receiver offset cancellation”

・ http://www.altera.co.jp/literature/hb/stratix-iv/stx4_siv52005.pdf
Search by keyword “Offset Cancellation Feature”

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