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SMSC LAN91C111 32/16/8-Bit Three-In-One Fast Ethernet Controller
Revision 1.0 (08-14-08) 4 SMSC AN 9.6
APPLICATION NOTE
Figure 3.1 BIU Section of functional Block Diagram
For those interested in designing connected to an ISA bus, SMSC provides both a reference design
and evaluation board. Please contact your SMSC Sales Representative or Distributor for information
regarding either of these products. The Data Sheet also contains block diagrams of a typical ISA, EISA,
and VL-Bus based designs.
3.2 ISA Bus
The LAN91C111 supports both an asynchronous and a synchronous bus interface. The industry
standard ISA bus is one of the typical asynchronous buses. This bus interface is well defined and
documented and as previously mentioned, details are available from SMSC regarding interfacing the
LAN91C111 to an asynchronous ISA type interface.
3.3 8-Bit Bus
The LAN91C111 supports 8-bit bus interface. Please see the following signal connection table.
Table 3.1 Single Connection Table
8-BIT BUS (HOST) LAN91C111 NOTES
A1-A15 A1-A15 Address Bus
D0-D7 D0-D7 Data pins D0-D7 and D8-D15 of the
LAN91C111 both connect to D0-D7 of the
8-bit bus
D0-D7 D8-D15
nBE0 nBE0 Assert nBE0 to enable the lowest byte
nBE1 nBE1 Assert nBE1 to enable the second lowest
byte