RapidIO: The Next Generation Communication Fabric For Embedded Application

B.2. GENERIC END POINT DEVICES: SOFTWARE-ASSISTED ERROR RECOVERY OPTION

This section describes the 1x/4x LP-Serial registers for a general end point device that supports software assisted error recovery. This is most useful for devices that for whatever reason do not want to implement error recovery in hardware and to allow software to generate link-request control symbols and see the results of the responses. This extended features register block is assigned extended features block ID=0×0002.

Table B.8. Bit settings for port n error and status CSRs

Bit	Name	Reset value	Description
0–10			Reserved
11	Output Retry-encountered	0b0	Output port has encountered a retry condition. This bit is set when bit 13 is set. Once set, remains set until written with a logic 1 to clear
12	Output Retried	0b0	Output port has received a packet-retry control symbol and can not make forward progress. This bit is set when bit 13 is set and is cleared when a packet-accepted or a packet-not-accepted control symbol is received (read-only)
13	Output Retry-stopped	0b0	Output port has received a packet-retry control symbol and is in the 'output retry-stopped' state (read-only)
14	Output Error-encountered	0b0	Output port has encountered (and possibly recovered from) a transmission error. This bit is set when bit 15 is set. Once set, remains set until written with a logic 1 to clear
15	Output Error-stopped	0b0	Output is in the 'output error-stopped' state (read-only)
16–20			Reserved
21	Input Retry-stopped	0b0	Input port is in the 'input ...