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168 Software Developer’s Manual
Ethernet Interface
8.6.3 Internal SerDes Mode
1
Control Bit Resolution
Tables 8-3, 8-4, and 8-5
2
list how on-chip Auto-Negotiation affects control bits in the Ethernet
controller. Table 8-5 lists the case where software Auto-Negotiation is not performed and link is
forced.
Table 8-3. Internal Serdes Mode
1
– Hardware Enabled
TXCW.ANE = 1b
Table 8-4. Internal Serdes
1
Mode – Software Enabled
TXCW.ANE = 0b
1. TBI Mode for the 82544GC/EI.
2. Not applicable to the 82541xx, 82547GI/EI, or 82540EP/EM.
Control Bit Effect on Control Bits
CTRL.FD Ignored; duplex is set by priority resolution of TXCW and RXCW
CTRL.SLU Ignored; it is not possible to force link configuration (ANE takes precedence)
CTRL.RFCE Set by priority resolution (read only)
CTRL.TFCE Set by priority resolution (read only)
CTRL.SPEED No impact; speed always 1000 Mb/s in Internal Serdes
a
mode
STATUS.FD Set by priority resolution
STATUS.LU Duplicate of RXCW.ANC (Auto-Negotiation complete)
STATUS.SPEED Internal SerDes
a
Mode is always 1000 Mb/s; fixed at 10b
a. TBI for the 82544GC/EI.
Control Bit Effect on Control Bits
CTRL.FD Duplex is set by software priority resolution
CTRL.SLU Set by software when Auto-Negotiation is complete.
CTRL.RFCE Set by software as a result of software priority resolution
CTRL.TFCE Set by software as a result of software priority resolution
CTRL.SPEED No impact; speed always 1000 Mb/s in Internal SerDes
a
mode
STATUS.FD Reflects the value of CTRL.FD
STATUS.LU Reflects CTRL.SLU and internal link indication
STATUS.SPEED Internal Serdes
a
Mode is always 1000 Mb/s; fixed at 10b
a. TBI for the 82544GC/EI.