MT89L86
Advance Information
Connection Memory Low - Read/Write
7
6
5
4
3
2
1
0
SAB2 SAB1 SAB0 CAB4 CAB3 CAB2 CAB1 CAB0
(CM low bits)
Bit
Name
Description
7-5
SAB2-0* Source Stream Address bits. These three bits are used together with SAB3 in CMH to
select up to 16 different source streams for the connection. Depending on the switching
configuration and the data rate selected in the application, 1, 2, 3 or all 4 SAB bits can be
used. See Tables 9 and 10 for details.
4-0
CAB4-0* Source Channel Address bits 0-4. These five bits are used together with CAB5-6 in
CMH to select up 128 different source channels for the connection. Depending on the
switching configuration and the data rate used in the application, 5, 6 or all 7 CAB bits
can be used to select respectively 32, 64 or 128 different channels.
See Tables 9 and 10 for details.
If bit two (MC) of the corresponding Connection High locations is 1, or if bit 6 of the Control Register is 1, then these entire eight bits are output
on the corresponding output channel and stream associated with this location. Otherwise, the bits are used as indicated to define the source
of the connection which is output on the channel and stream associated with this location.
Figure 6 - Connection Memory Low (CML) Bits
Identical
I/O
Rate
# of Input x
Output
Streams
SAB bits used to
determine the source
stream for the connection
CAB bits used to determine the source
channel for the connection
2 Mb/s
2 Mb/s
2 Mb/s
4 Mb/s
4 Mb/s
8 Mb/s
8x8
4x4
16x8
4x4
8x4
2x2
8x4
CAB4 to CAB0 (32 channel/stream)
CAB4 to CAB0 (32 channel/stream)
CAB4 to CAB0 (32 channel/stream)
CAB5 to CAB0 (64 channel/stream)
CAB5 to CAB0 (64 channel/stream)
CAB6 to CAB0 (128 channel/stream)
CAB5 to CAB0 (64 nibble/stream)
SAB2, SAB1, SAB0
SAB2, SAB1
SAB3, SAB2, SAB1, SAB0
SAB2, SAB1
SAB2, SAB1, SAB0
SAB2
Nibble Switch
(2 Mb/s)
SAB2, SAB1, SAB0
Table 9 - CAB and SAB Bits Programming for Identical I/O Rate Applications
SAB bits used to
Different
I/O
Rate
# of Input x
Output Streams
CAB bits used to determine the source
channel for the connection
determine the source
stream for the
connection
2 Mb/s to 4 Mb/s
2 Mb/s to 8 Mb/s
4 Mb/s to 2 Mb/s
8 Mb/s to 2 Mb/s
8x4
8x2
4x8
2x8
CAB4 to CAB0 (32 channel/stream)
CAB4 to CAB0 (32 channel/stream)
CAB5 to CAB0 (64 channel/stream)
CAB6 to CAB0 (128 channel/stream)
SAB2, SAB1, SAB0
SAB2, SAB1, SAB0
SAB2, SAB1
SAB2
Table 10 - CAB and SAB Bits Programming for Different I/O Rate Applications
18
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