IDT CPS-1848, User Manual

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2. RapidIO Ports > Packet Transfer Validation and Debug
CPS-1848 User Manual 66 June 2, 2014
Formal Status This document is confidential and is subject to an NDA.
Integrated Device Technology
2.11.5 Switch Cannot Transmit Packets
The performance counters in Table 18 can be used as a first step in debugging possible configuration or status issues that
prevent successful transmission of packets.
Table 18: Packet Counters and Configuration Issues – Switch Cannot Transmit Packets
Packet Counter Register Description Implication
Port {0..17} Not Acknowledgements
Received Counter Register This counter indicates the number of packets
that the link partner negatively acknowledged. If this counter is not 0, the switch is sending
packets to the link partner. The link partner is
rejecting the packets. Debug the link partner
configuration and status.
Port {0..17} VC0 Retry Symbols
Received Counter Register This counter indicates the number of packets
that the link partner acknowledged with a
Retry. The link partner is configured to accept
packets, but is congested. Debug the link
partner’s ability to accept packets.
Port {0..17} VC0 Transmitted Packets
Dropped Counter Register This counter indicates the number of packets
dropped by the switch port’s transmit logic. Packets are being dropped due to errors or
configuration issues (see
Table 19 ).
Port {0..17} VC0 TTL Packets Dropped
Counter Register This counter indicates the number of packets
dropped due to exceeding the Time To Live
(TTL) period. The TTL period is too short to allow packets to
be sent successfully. Disable the TTL function
or increase the time to live period (see
Packet
Time to Live CSR and Computing Timeout
Values ).
Port {0..17} VC0 CRC Limit Packets
Dropped Counter Register This counter indicates the number of packets
dropped due to exceeding the number of
consecutive Packet-Not-Accepted responses. The Port {0..17} Operations
Register [CRC_RETX_LIMIT] value is set too
low.
Alternatively, error detection has been
suppressed on the switch input port, and a
corrupted packet has been forwarded through
the switch to a link partner with error detection
enabled. Check
Port {0..17} Control 1
CSR [ERR_CHK_DIS] on all input ports.