Transceiver RX Component Reset

Transceiver RX component resets can be reset individually in either sequential mode or single mode. They are primarily used for special cases. These resets are needed when only a specific subsection needs to be reset.

Driving GTRXRESET from High to Low starts the component reset process. All RXPMARESETMASK and RXPCSRESETMASK bits along with RXRESETMODE must be held constant during the rest process.

When RXRESETMODE is set to sequential mode, the internal resets are toggled in sequence depending on the RXPMARESETMASK and RXPCSRESETMASK selection. When RXRESETMODE is set to single mode, the internal resets are toggled simultaneously depending on the RXPMARESETMASK and RXPCSRESETMASK selection.

In sequential mode, if the RX PCS is to be reset, RXUSERRDY must toggle High prior to the internal PCS reset signal being released, allowing RX reset to be completed.

Direct single reset ports EYESCANRESET, RXOOBRESET, RXCDRRESET, RXPRBSCNTRESET, and RXDPPCSRESET are available to perform single resets of the respective RX components. When direct single reset ports are toggled, a single reset is performed regardless of RXPMARESETMASK, RXPCSRESETMASK, and RXRESETMODE selection. These ports must be held Low during any sequential or single rests driven by GTRXRESET. In single mode, the RXRESETDONE port is not asserted.

The following table lists the recommended receiver resets for common situations.