
3 MOTHERBOARD
3006M100-002
3-3
•
four SCCs (Serial Communication Controllers) for handling traffic on slots 1-4; slots
5-6 are handled by an optional Data Expansion Module (DEM)
•
four baud rate generators
Memory
The motherboard holds the following types of memory:
•
128K x 8 bit (up to 256K x 8 bit) EPROM for booting the system after powering up or
reset, located at U22
•
128K x 8 bit FLASH for storing configuration data, located at U23
•
2M x 32 bit (8 M) of DRAM SIMM for data storage, located at U47
•
four 512K x 8 bit (2M) FLASH memory for storing application code, located at U28-
U31
•
256K x 32 bit (1M), 512K x 32 bit (2M), 1M x 32 bit (4M) FLASH SIMM for extra
application code storage, located at U46
A system bus on the motherboard allows the CPU and I/O cards to communicat
with each other and with memory via buffers located at U32-U34.
3.1.2
I/O Section
In the middle of the motherboard are six 120-pin card-edge connectors (located at
J5, J7, J9, J11, J13 and J15). They seat the I/O cards in their slots and connect
them to the I/O bus.
A seventh 120-pin card-edge connector at J3 provides a connector to seat the
optional DEM (Data Expansion Module) and connect it to the I/O bus.
Figure 3-2 Motherboard’s Processing Unit
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