Altera SerialLite II IP Core - Manual (Page 51)

3–28 Chapter 3: Parameter Settings
Error Handling
SerialLite II MegaCore Function January 2014 Altera Corporation
User Guide
Error Handling
The SerialLite II MegaCore function does error checking and has an interface to view
local errors. The errors are categorized, and the effect of an error depends on the type
of error that occurs.
The SerialLite II MegaCore function has three error types:
■ Data error
■ Link error
■ Catastrophic error
The causes and results of these errors are summarized in Table 3–12 .
reconfig_fromgxb O
The reconfig_fromgxb output signal is driven to an external dynamic
reconfiguration block. The width of this bus depends on the number of lanes (it may
require multiple transceiver QUAD blocks), and the device family (for Arria II GX and
Stratix IV, the bus is wider due to offset cancelation support).
This signal identifies the transceiver channel whose settings are being transmitted to
the dynamic reconfiguration. This signal must be connected as described in the
Arria II GX Device Handbook or the Stratix IV Device Handbook if the external dynamic
reconfiguration block is used. Otherwise, leave this signal unconnected.
For Arria II GX and Stratix IV, you must use the dynamic reconfiguration block because
they require offset cancelation.
gxb_powerdown I
gxb_powerdown resets and powers down all circuits in the transceiver block. This
signal does not affect the refclk buffers and reference clock lines.
All the gxb_powerdown input signals of cores placed in the same quad should be tied
together. The gxb_powerdown signal should be tied low or should remain asserted for
at least 2 ms whenever it is asserted.
Table 3–11. ALTGX Support Signals
Signal I/O Description
Table 3–12. Error Summary (Part 1 of 2)
Error Type Cause Action
Catastrophic
■ LSM cannot reverse polarity
■ LSM cannot reorder lanes
SerialLite II enters
nonrecoverable state
Link
■ Eight consecutive {|TS1|} sequences
received in all lanes simultaneously
■ Loss of character alignment
■ Loss of lane alignment
■ Loss of characters from
underflow/overflow
■ Data error threshold exceeded
■ Retry-on-error timer expired three
times
Trigger link initialization