The 28-Gbps ATT channels on Stratix V GT devices are high data rate channels. ATT channels require a Low Latency PHY with GT datapath setting. ATT duplex channel pairs use up to four normal channel resources (two of the triplet channels for each direction). Each end of the pair resides in separate triplets. For logical channel numbering, the RX channel is first, and the TX channel is second (0,1, and so on). Due to the RX and TX being separate numbers, the Transceiver Toolkit does not create a link pair for you automatically. You need to create a link manually.

You can use the Memory Initialization File (.mif) Writer reconfiguration IP option to directly access any non-protected transceiver dynamic reconfiguration bit in the device. The MIF Writer reconfiguration IP acts as the backbone for ATT channel support. With access to the transceiver dynamic reconfiguration memory map decoding, you can directly control many aspects of the transceivers even without official support from the Transceiver Toolkit or the PHY IP. This allows instant changing of settings to test a new combination without the long and tedious process of omnimap bit modification, creating a new SRAM Object File (.sof), and programming the device again. Also, it allows live checking of settings that can be modified by calibration IP or other actions that omnimap cannot take into account.

To enable ATT channels:

Use Tcl commands to control the MIF Writer.

To get the currently set logical address:

To set the logical address:

To get the physical interface number of the currently set logical address:

To read data:

To write data: