ZL50022
Data Sheet
When CMM is one, the device is programmed to perform one of the special per-channel transmission modes. Bits
PCC0 and PCC1 from connection memory are used to select the per-channel tristate, message or BER test mode
as shown in Table 54 on page 88.
15
14
0
13
0
12
0
11
0
10
9
8
7
6
5
4
3
2
1
0
UA
EN
MSG
7
MSG
6
MSG
5
MSG
4
MSG
3
MSG
2
MSG
1
MSG
0
PCC
1
PCC
0
CMM
=1
Bit
Name
Description
15
UAEN
Conversion between µ-law and A-law Enable (Message mode only)
When this bit is low, message mode has no µ-law/A-law conversion. Connec-
tion memory high will be ignored.
When this bit is high, message mode has µ-law/A-law conversion, and con-
nection memory high controls the conversion method.
14 - 11
10 - 3
Unused
Reserved
In normal functional mode, these bits MUST be set to zero.
MSG7 - 0 Message Data Bits
8-bit data for the message mode. Not used in the per-channel tristate and
BER test modes.
2 - 1
PCC1 - 0
Per-Channel Control Bits
These two bits control the corresponding entry’s value on the STio stream.
PC
C1
PC
C0
Channel Output Mode
0
0
1
1
0
1
0
1
Per Channel Tristate
Message Mode
BER Test Mode
Reserved
0
CMM = 1
Connection Memory Mode = 1
If this is high, the connection memory is in the per-channel control mode
which is per-channel tristate, per-channel message mode or per-channel BER
mode.
Note: For proper µ-law/A-law conversion, the CM_H bits should be set before Bit 15 (UAEN bit) is set to high.
Table 54 - Connection Memory Low (CM_L) Bit Assignment when CMM = 1
88
Zarlink Semiconductor Inc.
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
