2. Serial RapidIO Interface > Loss of Lane Synchronization
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Tsi576 User Manual
June 6, 2016
Integrated Device Technology
www.idt.com
shows the Tsi576 entering the silence period when it experiences the loss of signal from its
link partner.
Figure 11: LOLS Silent Period
Once synchronization is re-acquired, the Tsi576 transmitter resumes all timers and resumes sending
packets from the next un-sent packet in its transmit queue, using the next available ackID. The
transmitter handles the LOLS event as a temporary interruption that is completely ignored from the
perspective of packet transfers and control symbol transfers; the actual duration of the LOLS condition
has no impact on the process once the link is re-acquired.
Any packets transmitted to the Tsi576 are not acknowledged because the port is in input-error stopped
state. The link partner times out waiting for a packet acknowledge control symbol, and enters the
output-error stopped state. To recover, the link partner sends a link-request/input-status control symbol
to the Tsi576 port. This clears the input-error stopped state on the Tsi576.
The Tsi576 responds to its link partner’s link-request/input-status control symbol with a
link-response/status control symbol. The link partner accepts the symbol and exits the output-error
stopped state. The packet associated with the next expected ackID contained in the link-response/status
control symbol (if any) is then retransmitted and accepted by the Tsi576.
