1
1-4
QEC ASIC
Buffer
memory
XCVR
management
BigMAC ASIC
register
TX
buffer
MII Interface
Ultra DB40
External transceiver
Figure 1-2
SunFastEthernet Block Diagram
SunFastEthernet Adapter User Guide—November 1994
SBus
Local bus
EPROM
RX
buffer
BabyBAC
Transceiver
RJ45
Hub