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10Base-T PHY Registers
A-51
Register Definitions
Table A–25. ThunderLAN PHY Status Register Bits (Continued)
Bit Name Function
13 POLOK
†
Polarity OK: When this bit is high (default), the 10Base-T PHY receives valid (nonin-
verted) link pulses. If this bit goes low, it indicates that a sequence of seven consecutive
inverted link pulses has been detected.
12 TPENERGY Twisted-pair energy detect: This bit only has meaning in AUI mode. When set to a 1, it
indicates that the PHY receives of impulses on the FRCVP/FRCVN pins. Energy is de-
tected in the form of link pulses, the sense of which is determined by the POLREV bit.
Note that if the POLREV bit is set incorrectly, link pulses are not seen and this bit is not
set.
†
11–0 Reserved Read as 0
†
This function is provisional. It is possible for a link pulse with gross undershoot to appear as an inverted link pulse.