Motorola MPC8260 - Manual (Page 498)

15-8 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA
Part IV. Communications Processor Module
Note that each SADx and MADx corresponds to a pair of separate receive and transmit
address pins.
The MPC8260 has 16 output address pins and 10 input address pins dedicated for the
UTOPIA interface. However, it has two FCCs with two parts eachÑreceiver and
transmitter that can be ether master or slave concurrently. The MPC8260 allows both FCC1
and FCC2 to connect to the address lines without putting limitations on being a master or
slave, as described in the following:
¥ For master mode: The user has two groups of eight address pins each. Three pins
from each group are always connected to FCC1 and three are always connected to
FCC2. The user decides which FCC uses the remaining two pins by programming
CMXUAR[MADx]. See Figure
Figure 15-5. Connection of the Master Address
¥ For slave modeÑThe user has two groups of Þve address pins each. The user
decides which FCC uses each pin by programming CMXUAR[SADx]. Connect any
UTOPIA pins that are not connected to MPC8260 pins to GND. See Figure 15-6.
FCC1
FCC2
M
S
M
S
M
S
M
S
5
5
5
5
5
5
5
5
8
5
8
5
0
1
2
3
4
4
3
2
1
0
These three bits always relate
These three bits always relate
to FCC2 master
Pins
to an FCC1 master.
These two address bits relate to the
master of FCC1 or FCC2 according
to the programming. Bit 4 is the
msb.