Altera RapidIO II MegaCore Function User Manual
Page 154
6–16
Chapter 6: Software Interface
Physical Layer Registers
RapidIO II MegaCore Function
August 2014
Altera Corporation
User Guide
PORT_ERR
[2]
RW1C
This bit is set if the input port error recovery state machine encounters
an unrecoverable error or the output port error recovery state machine
enters the fatal_error state.
The input port error recovery state machine encounters an
unrecoverable error if it times out while waiting for a link-request
after sending a packet-not-accepted control symbol.
The output port error recovery state machine enters the fatal_error state
if the following sequence of events occurs:
1. The output port error recovery state machine enters the stop_output
state when it receives a packet-not-accepted control symbol. In
response, it sends the
input-status
link-request/input-status (restart-from-error)
control symbol.
2. One of the following events occurs in response to the link-request
control symbol:
■
If the link-response is received but the ackID is outside of the
outstanding ackID set, then the output port error recovery state
machine enters the fatal_error state.
■
If the port times out before receiving link-response, for seven
attempts to send a link-request, then the output port error
recovery state machine enters the fatal_error state.
When the PORT_ERR bit is set, software determines the behavior of the
RapidIO II IP core, as described in
. After it
is set, this bit is cleared only when software writes the value of 1 to it.
The port_error output signal mirrors this register bit.
1'b0
PORT_OK
[1]
RO
Input and output ports are initialized and can communicate with the
adjacent device. This bit is asserted when the link is initialized. The value
in this field appears on the port_ok output signal.
1'b0
PORT_UNINIT
[0]
RO
Input and output ports are not initialized and are in training mode. This
bit and the PORT_OK bit are mutually exclusive: at any time, at most one
of them can be asserted. The RapidIO II IP core deasserts this bit when
the port is initialized.
1'b1
Note to
:
(1) Refer to
“Error Detection and Management” on page 4–76
for details.
Table 6–14. Port 0 Error and Status CSR—Offset: 0x158
(1)
(Part 5 of 5)
Field
Bits
Access
Function
Default