IDT CPS-1848, User Manual

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6. Event Management > Event Detection
CPS-1848 User Manual 124 June 2, 2014
Formal Status This document is confidential and is subject to an NDA.
Integrated Device Technology
• The port’s dropped packet counter is incremented
• If notification is enabled, the system is notified by a port-write and/or interrupt
If a packet is transmitted from the Final Buffer to the link partner when a TTL timeout occurs for the packet, the port continues
transmitting the packet to its normal completion. If NACKed by the link partner, the packet is not retransmitted and is
considered a dropped packet with action taken as defined above.
If a packet transmission is completed from the Final Buffer to the link partner and then a TTL timeout occurs for the packet, the
port will wait for the ACK/NACK control symbol before processing the timeout event. If the packet is accepted by the link
partner, it is removed from the Final Buffer and normal transmission continues without notification of a dropped packet
condition. If the packet is NACKed by the link partner, the packet is not retransmitted and is considered a dropped packet with
subsequent action as defined above.
6.2.3 Lane Events
Lane events are related to individual lane behaviors. Within the RapidIO protocol, lane behaviors are limited to 8b/10b
encoding, idle sequences operation, and lane initialization. Information about all lane events is in
Table 39 . This table has four
columns:
• Event Name – The short form by which the event is consistently identified.
• Detection Enable – Any register settings required to enable detection of the event. “Always Detected” means that there are
no controls to disable detection of the event.
• Information Capture Enable – The register settings required to enable the event to supply the leaky bucket. These register
settings also enable capture of information associated with the event.
• Information Captured – Summary of information captured for the event, as well as the status bit that indicates the event was
detected. Multiple status bits may be set, however information is captured only for the first enabled event. Subsequent
events do not have any information captured. The values in the “Information Captured” column are described in
Table 38
When a CPS-1848 port's link partner re-initializes or is extracted from the system, packets may be
discarded due to TTL. Depending on the timing of the extraction, it may not be possible for the switch
port to resume transmission without software intervention.
For more information on hot insertion and extraction, see
Hot Extraction/Insertion .
Table 38: Lane Event Information Captured Value Descriptions
Value Description
No Info No information is captured for this event.
CS Field The decoded content of the IDLE2 Control and Status field is captured in the following registers:
•
Lane {0..47} Attributes Capture Register : INFO_TYPE is set to 0b100
• Lane {0..47} Data Capture 0 Register
The Lane {0..47} Data Capture 0 Register contains the data in the CS Field of the received IDLE2
sequence.
Data The last four 8-bit characters received on the link are captured in the following registers:
•
Lane {0..47} Attributes Capture Register : INFO_TYPE is set to 0b100
• Lane {0..47} Data Capture 0 Register