http://www.sun.com/microelectronics/chipsets/fastethernet.html
   
   This is the sun-made ASIC that has a FAS-336 integrated into it, as well
   as the processor for the HME and bpp interfaces. Sun uses this chip on all
   their products that use either or both of the fas and hme interfaces (this
   includes motherboards and io cards).


for SBUS, you mean.  the PCI `hme' chip also has the `ebus' on it... that's
why my hme card probes like:

Sun Microsystems PCIO Ebus2 (miscellaneous bridge, revision 0x01) at pci1 dev 3 function 0 not configured
hme1 at pci1 dev 3 function 1: address 08:00:20:a7:7d:25
ukphy0 at hme1 phy 1: Generic IEEE 802.3u media interface
ukphy0: OUI 0x00601d, model 0x000c, rev. 1
ukphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
hme1: using vector 25 for interrupt