When the ctl_autoneg_enable input signal is set to
1, auto negotiation begins automatically at power-up, or if the carrier signal is lost,
or if the input ctl_restart_negotiation signal is cycled from a 0 to a 1. All of
the Ability input signals as well as the two input signals pause and
asm_dir are tied Low or High to indicate the capability of the hardware. The
nonce_seed[7:0] input must be set to a unique non-zero value for every
instance of the auto negotiator. This is important to guarantee that no dead-locks occur
at power-up. If two link partners connected together attempt to auto-negotiate with
their nonce_seed[7:0] inputs set to the same value, the auto-negotiation fails
continuously. The ctl_an_pseudo_sel input is an arbitrary selection that is used
to select the polynomial of the random bit generator used in bit position 49 of the DME
pages used during auto-negotiation. Any selection on this input is valid and does not
result in any adverse behavior.