1-1
Chapter 1
Signal/
Connection
Descriptions
1.1 Signal Groupings
The MSC8101 external signals are organized into functional groups, as shown in Table 1-1, Figure 1-1,
and Figure 1-2. Table 1-1 lists the functional groups, the number of signal connections in each group,
and references the table that gives a detailed listing of multiplexed signals within each group. Figure 1-1
shows MSC8101 external signals organized by function. Figure 1-2 indicates how the parallel
input/output (I/O) ports signals are multiplexed. Because the parallel I/O design supported by the
MSC8101 Communications Processor Module (CPM) is a subset of the parallel I/O signals supported by
the MPC8260 device, port pins are not numbered sequentially.
Table 1-1.
MSC8101
Functional Signal Groupings
Functional Group
Number of
Signal
Connections
Detailed Description
Power (V
CC
, V
DD
, and GND)
80
Table 1-1 on page 1-4
Clock
6
Table 1-2 on page 1-5
Reset, Configuration, and EOnCE
11
Table 1-3 on page 1-6
System Bus, HDI16, and Interrupts
133
Table 1-4 on page 1-8
Memory Controller
27
Table 1-2 on page 1-16
Communications Processor Module (CPM)
Input/Output Parallel Ports
Port A
26
Table 1-3 on page 1-19
Port B
14
Table 1-4 on page 1-27
Port C
18
Table 1-5 on page 1-32
Port D
8
Table 1-6 on page 1-42
JTAG Test Access Port
5
Table 1-7 on page 1-45
Reserved (denotes connections that are always reserved)
5
Table 1-8 on page 1-46
