
ÉlanSC310 Microcontroller Evaluation Board User’s Manual
2-18
1.
0
Local Bus Mode
The ÉlanSC310 microcontroller evaluation board provides a proprietary local-bus
connector for testing of local-bus designs. Since this connector is not standard, a
custom interface is required to test the local-bus functionality of the ÉlanSC310
microcontroller on the evaluation board. In Local Bus mode, some of the ISA bus
signals are lost. Refer to the ÉlanSC310 Microcontroller Data Sheet for more
details on what signals are available in this mode. Since different local-bus
implementations require different signal connections, the local bus signal VLRDYI
can be connected to either VGARDY (from the local bus device) or to VLRDYO
(from the ÉlanSC310) using switches 2 and 3 on SW3 (switches 1 and 4 are no
connects). Note that VLRDYI corresponds to LRDY on the ÉlanSC310
microcontroller, and VLRDYO corresponds to CPURDY.
NOTE:
Due to loading, High Speed operation is not possible without depopulating
several components.
Memory
The ÉlanSC310 microcontroller evaluation board supports up to 16 Mbyte of
memory in two different formats: 72-pin, 16-bit SIMM; or 30-pin, 8-bit SIMMs.
Only one of these options can be used at a time. (That is, if the 30-pin DRAM
sockets are used, the 72-pin DRAM socket must be empty. If the 72-pin DRAM
socket is used, the 30-pin DRAM sockets must be empty.)
SW3-2
Affected Signals
ON
Connects VGARDY to VLRDYI
OFF
Open
SW3-3
Affected Signals
ON
Connects VLRDYO to VLRDYI
OFF
Open
evalbd.book : ch2 Page 18 Thursday, August 8, 1996 2:34 PM