CHARM Bus Statistics dialog (CHARM)

The CHARM Bus Statistics dialog shows counter values for all of the bus statistics for the selected CHARM since the last time the CHARM I/O Card (CIOC) was reset.

If power to the CIOC is interrupted, all counter values on the CHARM Bus Statistics dialog restart from zero after power is restored and the CIOC comes out of the reset state. In the event of a switchover to the standby CIOC of a redundant pair, all counter values on the CHARM Bus Statistics dialog restart from zero.

The CHARM Bus Statistics dialog for a selected CHARM contains the following values:

• Acyc Invalid Response - The number of acyclic responses with errors received by the selected CHARM. Possible errors include: a bad CRC (cyclic redundancy check), an invalid length, or any CHARM error status. The following conditions can cause an acyclic response with errors:
  • The CHARM failed to recognize an acyclic request.
  • An internal fault occurred in the CHARM.
• Acyc No Response - The number of acyclic responses from the selected CHARM that timed out. A time out usually indicates that the CHARM was not communicating.
• Acyc Request - The number of acyclic requests sent to the selected CHARM. Acyclic requests include all message types except outputs and Cyclic Scan Update responses.
• Acyc Responses - The number of acyclic responses, including both successful and failed responses, received from the selected CHARM.
• Acyc Valid Response - The number of successful acyclic responses received from selected CHARM.
• Charm Comms - The number of times CHARM communications transitioned from not communicating to communicating.
• Charm Failed Send - The number of times that an output or acyclic request to the selected CHARM failed to be successfully built and sent from the CIOC. Typically, a request only fails because of a CIOC software problem, usually indicating a loss of buffers.
• Charm No Comms - The number of times CHARM communications transitioned from communicating to not communicating.
• Charm Retries - The number of times that an output or acyclic request to the selected CHARM was retried before a successful response was received. Typically, a request is retried only when the request or response is corrupted by noise on the communications bus.
• Cyc Updates - The number of successful Cyclic Scan Update responses from the selected CHARM.
• Cyc Updates Failed - The number of unsuccessful Cyclic Scan Update responses from the selected CHARM. The following conditions may trigger an unsuccessful Cyclic Scan Update response:
  • No physical CHARM is installed in this configured slot.
  • The CHARM installed in this slot is not communicating.
  • The CHARM installed in this slot does not match the configured CHARM type.
• Outputs Failed - The number of outputs that failed to be successfully written to the selected CHARM. The following conditions can trigger a write failure:
  • The CHARM is not communicating.
  • The physical CHARM type does not support outputs.
  • An internal fault occurred in the CHARM.
• Outputs Success - The number of outputs successfully written to the selected CHARM.
• Outputs Written - The number of outputs written to the selected CHARM.