AM79C32A datasheet(22/101 Pages) AMD

22 / 101 page

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

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

LIU

09893H-3

Figure 2.

MUX Logical Channels

Port 1

Port 2

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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