
6–8 Chapter 6: Software Interface
Physical Layer Registers
RapidIO MegaCore Function August 2014 Altera Corporation
User Guide
IN_ERR_STOP
[8] RO
Input port is stopped due to a transmission error. The port is in the
Input Error Stop state.
The following conditions cause the input port to transition to this state:
■ Cancellation of a packet by using the
restart-from-retry
control
symbol.
■ Invalid character or valid character other than A, K, or R in an idle
sequence.
■ Single bit transmission errors.
■ Any of the following link protocol violations:
Unexpected packet accepted
Unexpected packet-retry
Unexpected packet-not-accepted packet Acknowledgment control
symbol with an unexpected
packet_ackID
Link time-out while waiting for an acknowledgment control symbol
■ Corrupted control symbols, that is, CRC violations on the symbol.
■ Any of the following Packet Errors:
Unexpected
ackID
value
Incorrect CRC value
Invalid characters or valid nondata characters
Max data payload violations
The recovery mechanism consists of these steps:
1. Issue a
packet-not-accepted
control symbol.
2. Wait for
link-request/input-status
control symbol.
3. Send
link-response
control symbol.
1'b0
RSRV
[7:5] RO Reserved
3'h0
PWRITE_PEND
[4] RO This register is not implemented and is reserved. It is always set to zero.
1'b0
RSRV
[3] RO Reserved
1'b0
Table 6–10. Port 0 Error and Status CSR—Offset: 0x158
(1)
(Part 2 of 3)
Field Bits Access Function Default
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