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Software Developer’s Manual 343
Register Descriptions
13.7.13 Sequence Error Count
SEC (04038h; R)
This register counts sequence error events. The proper sequence of 8b/10b symbols is as follows:
idle, start-of-frame (SOF), data, pad (optional), end-of-frame (EOF), fill (optional), idle. Hardware
increments this counter for any illegal sequence of delimiters. If the link is not up, this register does
not increment. This register is only valid in internal SerDes mode (TBI mode for the
82544GC/
EI
).
Table 13-105. SEC Register Bit Description
13.7.14 Carrier Extension Error Count
CEXTERR (0403Ch; R)
This register counts the number of packets received in which the carrier extension error was
signaled across the internal PHY interface. The PHY propagates carrier extension errors to the
MAC when an error is detected during the carrier extended time of a packet reception. An
extension error is signaled by the PHY by the encoding of 1Fh on the receive data inputs. This
register only increments if receives are enabled and the Ethernet controller is operating at
1000 Mb/s. For example, internal PHY or internal SerDes modes (internal PHY or TBI modes for
the
82544GC/EI).
Table 13-106. CEXTERR Register Bit Description
31 0
SEC
Field Bit(s)
Initial
Value
Description
SEC 31:0 0b Number of sequence error events.
31 0
CEXTERR
Field Bit(s)
Initial
Value
Description
CEXTERR 31:0 0b Number of packets received with a carrier extension error.