![](http://datasheet.mmic.net.cn/330000/PEF20550_datasheet_16444055/PEF20550_145.png)
PEB 20550
PEF 20550
Detailed Register Description
Semiconductor Group
145
01.96
Note: When reading a DM-data field location, all 8 bits are read regardless of the
bandwidth selected by the MOC-bits.
2. Writing to the upstream DM-code (tristate) field.
Control-reading the upstream DM-code (tristate).
MOC = 1100
MOC = 1101
Read/write tristate info from/to single PCM time slot
Write tristate info to all PCM time slots
Note: The tristate field is exchanged with the 4 least significant bits (LSBs) of the MADR.
3. Writing data to the upstream or downstream CM-data field (e.g. signaling code).
Reading data from the upstream or downstream CM-data field.
4. Writing data to the upstream or downstream CM-data field and code field
(e.g. switching a CFI to/from PCM-connection).
The 4-bit code field of the control memory (CM) defines the functionality of a
CFI time slot and thus the meaning of the corresponding data field. This 4-bit
code, written to the MACR:CMC3..0 bit positions, will be transferred to the
CM-code field. The 8-bit MADR value is at the same time transferred to the
CM-data field. There are codes for switching applications, pre-processed
applications and for direct
μ
P-access applications, as shown below:
a) Switching Applications
CMC = 0000
Unassigned channel (e.g. cancelling an assigned channel)
CMC = 0001
Bandwidth 64 kBit/s
CMC = 0010
Bandwidth 32 kBit/s
CMC = 0011
Bandwidth 32 kBit/s
CMC = 0100
Bandwidth 16 kBit/s
CMC = 0101
Bandwidth 16 kBit/s
CMC = 0110
Bandwidth 16 kBit/s
CMC = 0111
Bandwidth 16 kBit/s
Note: The corresponding CFI time slot bits to be transferred are chosen in the
CSCR-register.
PCM time slot bits transferred: 7..0
PCM time slot bits transferred: 3..0
PCM time slot bits transferred: 7..4
PCM time slot bits transferred: 1..0
PCM time slot bits transferred: 3..2
PCM time slot bits transferred: 5..4
PCM time slot bits transferred: 7..6
MACR:
RWS
MOC3
MOC2
MOC1
MOC0
0
0
0
MACR:
RWS
1
0
0
1
0
0
0
MACR:
0
1
1
1
CMC3
CMC2
CMC1
CMC0