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AM79C30AVC датащи(PDF) 22 Page - Advanced Micro Devices

номер детали AM79C30AVC
подробное описание детали  Digital Subscriber Controller??(DSC?? Circuit
PDF  101 Pages
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производитель  AMD [Advanced Micro Devices]
домашняя страница  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79C30AVC датащи(HTML) 22 Page - Advanced Micro Devices

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Am79C30A/32A Data Sheet
Therefore, in this example, MCR1 provides a data link
from the S Interface and MCR2 sets up a voice connec-
tion across the S Interface.
To loopback a channel, the same channel code is used
for port 1 and port 2. For example, to loopback B1, B2,
and Ba, the MCRs would be:
MCR3 has higher priority than MCR2. MCR2 has
higher priority than MCR1.
If multiple connections are made to the same port, the
data from the connecting ports in the highest priority
MCR will overwrite the data from the connecting port in
the lower priority MCR, for example:
The final data transfers are:
B1 (LIU) receives Bb (MPI),
Ba (MAP) receives Bb (MPI),
Bb (MPI) receives Ba (MAP).
Therefore, the data transfer from B1 (LIU) to Bb (MPI)
is lost in the arrangement proposed in MCR2.
Port 1
Port 2
Register 7 6 5 4 3 2 1 0 Channel Connection
MCR1
0 0 0 1 0 0 0 1 B1 (LIU) Loopback
MCR2
0 0 1 0 0 0 1 0 B2 (LIU) Loopback
MCR3
0 0 1 1 0 0 1 1 Ba (MAP) Loopback
Peripheral Port
B-channel
MUX
Ba MAP
MPI
Bb
Bc
Bd
Be
Bf
B1
B2
LIU
09893H-3
Figure 2.
MUX Logical Channels
Port 1
Port 2
Register 7 6 5 4 3 2 1 0 Channel Connection
MCR1
0 0 0 0 0 0 0 0 No connect
MCR2
00 010 100 B1 (LIU)
Bb (MPI)
MCR3
0 1 0 0 0 0 1 1 Bb (MPI)
Ba (MAP)



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