mt90502ag2 Zarlink Semiconductor, mt90502ag2 Datasheet - Page 94
mt90502ag2
Manufacturer Part Number
mt90502ag2
Description
Multi-channel Aal2 Sar
Manufacturer
Zarlink Semiconductor
Datasheet
1.MT90502AG2.pdf
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2.9.3.2
The procedure is identical for both remote and local channels, as the silence suppression function requires
information for both local and remote CPS-Packet mean values to consult the State Graph (see Figure 52) and
determine the CPS-Packet status. Therefore, a channel on which complex silence suppression is enabled must
have its transmit and receive direction streams mapped on consecutive stream and the same time slot (e.g., see
Figure 54, “Complex Silent Suppression Stream Configuration,” on page 94). For example, the transmission
stream
Silence Suppression State Table
To determine a CPS-Packet status (i.e., voice, transitional & silence), the TX TDM will reference the local and
remote decibel energy levels in external memory. The table contains 2-bit values indicating a combination of local
and remote energy levels. Note the Silent State Graph as shown in Figure 52.
The Silence Suppression State Table (4KB) is located in the variable structures of TX SSRAM determined by the
‘Table Offset[20:12]’ field in the CPS-Packet Final Assembly Structure (see Figure 63). The MT90502 can
accommodate a different State Table for as many as 512 channels, as different channels may exhibit different line
characteristics. The Table Offset field in the CPS-Packet Final Assembly Structure (shown in Figure 63) points to
the base address of the Silence Suppression State Table for the associated channel.
(odd)
CPS-Packet Silence State
17, time slot 4 the associated reception stream is reception stream
Rx PCM
ct_frame
ct_frame
Tx PCM
Figure 55 - ADPCM Complex Silent Suppression Stream Configuration
ct_d[0]
ct_d[1]
ct_d[2]
ct_d[3]
ct_d[0]
ct_d[1]
ct_c8
ct_c8
Figure 54 - Complex Silent Suppression Stream Configuration
Complex Silence Suppression TDM Channel Mapping
CODEC
Local ADPCM Nibble
Zarlink Semiconductor Inc.
MT90502
Tx ADPCM
Tx PCM
Rx PCM
Rx ADPCM
94
Remote PCM Byte
Remote PCM Byte
Local PCM Byte
Local PCM Byte
CT_D[0]
CT_D[3]
MT90502
CT_D[2]
CT_D[1]
(even)
16 time slot 4.
UTOPIA
Data Sheet
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