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288 Software Developer’s Manual
Register Descriptions
Table 13-59. RXCW Register Bit Description
Field Bit(s)
Initial
Value
Description
RxConfigWord 15:0 X
Data received during Auto-Negotiation process.
When performing hardware Auto-Negotiation
(TXCW.ANE = 1b), the “AN link partner ability base page
register” is recorded in the RxConfigWord.
When TXCW.ANE is clear, then this register is used by
software to perform software based Auto-Negotiation. In
that capacity, RxConfigWord records the raw values
returned from the Auto-Negotiation process.
Reserved 25:16 0b
Reserved
Reads as 0b.
Should be written with 0b for future compatibility.
RxConfigNoCarrier 26 0b
Carrier Sense Indication
0b = Ethernet controller not receiving idle characters
(Carrier sense is true)
1b = Ethernet controller receiving idle characters (Carrier
sense is false)
Hardware sets RxConfigNoCarrier when it is receiving idle
characters (and when receiving link configuration
information or port status).
Software can use this bit to determine that idles have been
seen prior to exiting the link start-up procedure.
82544GC/EI only:
Valid only in software Auto-Negotiation mode
(TXCW.ANE = 0b).
RxConfigInvalid 27 0b
Invalid Symbol during configuration process
0b = Have not received an invalid symbol during Auto-
Negotiation process.
1b = Have received an invalid symbol during Auto-
Negotiation process (bit is LH).
If the Ethernet controller detects an invalid symbol at any
time, it sets the RxConfigInvalid bit. The bit is latched high
until read by software. Software is expected to restart the
configuration process when the Ethernet controller receives
an invalid symbol at any time during the Auto-Negotiation
process.
82544GC/EI only:
Valid only in software Auto-Negotiation mode
(TXCW.ANE = 0b).
RxConfigChange 28 0b
Change to the RxConfigWord indication
0b = RxConfigWord has changed since last read.
1b = RxConfig is unchanged since last read (LH)
Indicates that the Ethernet controller interface has seen a
change to the RxConfigWord. This bit is latched high until
read by software.
82544GC/EI only:
Valid only in software Auto-Negotiation mode
(TXCW.ANE = 0b).