IDT CPS-1848, User Manual

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2. RapidIO Ports > Packet Transfer Validation and Debug
CPS-1848 User Manual 63 June 2, 2014
Formal Status This document is confidential and is subject to an NDA.
Integrated Device Technology
2.11.2 Successful Packet Transfer
The registers in Table 14 are useful for confirming successful packet transfer. These registers should be checked for the switch
path used by each pair of endpoints, in both directions.
2.11.3 Switch Cannot Accept Packets
The performance counters in Table 15 can be used as a first step in debugging why a switch port cannot accept packets.
Table 14: Success Case Packet Transfer Counters
Packet Counter Register Description Implication
Port {0..17} VC0 Acknowledgements
Transmitted Counter Register This counter indicates the number of packets
that the switch port successfully received from
the link partner. If this number is unexpectedly 0, see Switch
Cannot Accept Packets .
Port {0..17} VC0 Packets Received
Counter Register This counter indicates the number of packets
that the switch saw the link partner attempt to
send. If this counter is not the same as the Port
{0..17} VC0 Acknowledgements Transmitted
Counter Register
, there may be retries and/or
error conditions on the link.
Port {0..17} VC0 Switch Crosspoint
Buffer Output Packet Counter Register This counter indicates the number of
successfully received packets that are
transferred through the fabric to this port. If Port {0..17} VC0 Acknowledgements
Transmitted Counter Register is not 0 on the
port that should be receiving packets, and this
counter is 0 on the port that should be
transmitting the packets, this indicates a
routing configuration issue.
Port {0..17} VC0 Acknowledgements
Received Counter Register This counter indicates the number of packets
that the switch port successfully sent to the
link partner. If this counter is 0, there may be a
configuration issue on the switch or on the link
partner.
Port {0..17} VC0 Packets Transmitted
Counter Register This counter indicates the number of packets
that the switch port attempted to send to the
link partner. If this counter is not the same as the Port
{0..17} VC0 Acknowledgements Received
Counter Register
, there may be retries and/or
error conditions on the link.
Table 15: Packet Counters and Configuration Issues – Switch Cannot Accept Packets
Packet Counter Register Description Implication
Port {0..17} Not Acknowledgements
Transmitted Counter Register This counter indicates the number of packets
that the switch port acknowledged with a
Packet Not Accepted control symbol. If this counter is not 0, the switch has a
configuration or status that prevents packet
acceptance (see
Table 16 ).
Port {0..17} VC0 Retry Symbols
Transmitted Counter Register This counter indicates the number of packets
that the switch port acknowledged with a Retry
control symbol. If this counter is not 0, the switch is configured
to accept packets but is congested. This may
indicate that there is a bandwidth mismatch in
the system. It may also indicate that the switch
is unable to send packets to the destination
(for more information, see
Switch Cannot
Transmit Packets ).