Table 4–10 – Altera SerialLite II IP Core User Manual
Page 83
Chapter 4: Functional Description
4–29
Signals
January 2014
Altera Corporation
SerialLite II MegaCore Function
User Guide
shows the troubleshooting signals. These signals do not necessarily need to
be connected to external logic. In general, they are for diagnostic purposes. Some
signals in
are only available in certain configurations.
Table 4–10. Troubleshooting Signals (Part 1 of 2)
Signal
Direction
Clock Domain
Description
stat_tc_rst_done
Output
tx_coreclock
Reset controller logic Done signal. When
high, the reset controller has completed the
ALTGXB reset sequence successfully.
err_rr_foffre_oflw
Output
rrefclk
Indicates that frequency offset tolerance FIFO
buffer has overflowed. The link restarts.
stat_tc_foffre_empty
Output
tx_coreclock
Indicates that frequency offset tolerance FIFO
buffer has underflowed. The link does not go
down. IDLE characters are inserted. This
does not have a negative impact on the core,
and is simply for diagnostic purposes.
stat_rr_ebprx
Output
rrefclk
Indicates that an end of bad packet character
was received.
err_rr_bip8
Output
rrefclk
Indicates that a BIP-8 error was detected in
the received link management packet.
err_rr_crc
Output
rrefclk
Indicates that a CRC error was detected in the
received segment/packet.
err_rr_fcrx_bne
Output
rrefclk
Indicates that a flow control link management
packet was received, but flow control is not
enabled.
err_rr_roerx_bne
Output
rrefclk
Indicates that a retry-on-error link
management packet was received, but Retry-
on-error parameter is not enabled.
err_rr_invalid_lmprx
Output
rrefclk
Indicates that an invalid link management
packet was received.
err_rr_missing_start_dcw
Output
rrefclk
Indicates that data byte(s) received, but a
start of data control word (DCW) is missing.
err_addr_mismatch
Output
rrefclk
Indicates that the start and end address fields
do not match. Segments are marked with an
error. Possible packets are destined for an
invalid address.
err_rr_pol_rev_required
Output
rrefclk
May indicate catastrophic error. Polarity on
the input ALTGXB lines is reversed; the
MegaCore function cannot operate.
If you see the signal for the first time, you
should manually reset the core. If the signal
triggers again after you reset, then it
confirms a catastrophic error.
err_rr_dskfifo_oflw
Output
rrefclk
Indicates that deskew FIFO buffer has
overflowed. Link restarts.
stat_rr_dskw_done_bc
Output
rrefclk
Indicates that a bad column was received
after successful deskew completion. Link is
restarted.