zl50018gag2 Zarlink Semiconductor, zl50018gag2 Datasheet - Page 102
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zl50018gag2
Manufacturer Part Number
zl50018gag2
Description
2 K Digital Switch With Enhanced Stratum 3 Dpll
Manufacturer
Zarlink Semiconductor
Datasheet
1.ZL50018GAG2.pdf
(136 pages)
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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 70 on page 102.
24.3
Connection memory high provides the detailed information required for µ-law and A-law conversion. ICL and OCL
bits describe the Input Coding Law and the Output Coding Law, respectively. They are used to select the expected
PCM coding laws for the connection, on the TDM inputs, and on the TDM outputs. The V/D bit is used to select the
class of coding law. If the V/D bit is cleared (to select a voice connection), the ICL and OCL bits select between
A-law and µ-law specifications related to G.711 voice coding. If the V/D bit is set (to select a data connection), the
ICL and OCL bits select between various bit inverting protocols. These coding laws are illustrated in the following
table. If the ICL is different than the OCL, all data bytes passing through the switch on that particular connection are
translated between the indicated laws. If the ICL and the OCL are the same, no coding law translation is performed.
Note: For proper
14 - 11
10 - 3
Connection Memory High (CM_H) Bit Assignment
2 - 1
Bit
15
0
15
UA
EN
14
0
Table 70 - Connection Memory Low (CM_L) Bit Assignment when CMM = 1
MSG7 - 0
PCC1 - 0
CMM = 1
Unused
Name
UAEN
13
0
µ-
law/A-law conversion, the CM_H bits should be set before Bit 15 (UAEN bit) is set to high.
12
0
11
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.
Reserved. In normal functional mode, these bits MUST be set to zero.
Message Data Bits: 8-bit data for the message mode. Not used in the
per-channel tristate and BER test modes.
Per-Channel Control Bits: These two bits control the corresponding entry’s
value on the STio stream.
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 mes-
sage mode or per-channel BER mode.
0
MSG
10
7
MSG
9
6
Zarlink Semiconductor Inc.
MSG
8
5
PC
C1
ZL50018
0
0
1
1
MSG
102
7
4
PC
C0
0
1
0
1
MSG
6
3
Description
Channel Output Mode
Per Channel Tristate
BER Test Mode
MSG
Message Mode
5
2
Reserved
MSG
4
1
MSG
3
0
PCC
2
1
PCC
1
0
CMM
Data Sheet
=1
0
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