MT92210 Zarlink Semiconductor, MT92210 Datasheet - Page 119

• Manufacturer Part Number: MT92210
• Description: 1023 Channel Voice Over ip (VoIP) Processor
• Manufacturer: Zarlink Semiconductor

Data Sheet
9.3
The RX TDM module is responsible for copying data from the circular buffers contained in SSRAM B and passing
them on to the H.110 interface. The RX TDM uses an RX Channel Association Memory to associate each of the
1023 time slots it supports to either a PCM buffer or an HDLC stream. The chip can support up to 1023 PCM
buffers or up to 512 HDLC streams, or any combination of the two (two PCM buffers cost the same as 1 HDLC
stream). Any of the 1023 time slots supported can also be configured as Low Latency Loopback: this means that
the data sent onto the time slot will not come from a circular buffer but will be received from another time slot on the
bus, treated by the TX TDM.
This is the format of the RX Channel Association Memory:
RX TDM Data Path
TSSTn
TSSTn
TSSTn+1
TSSTn+1
PCM
PCM
PCM
PCM
PCM
PCM
PCM
PCM
PCM
PCM
PCM
PCM
1
1
0
0
0
0
0
0
0
0
0
0
PCM
PCM
b7
b7
b7
b7
b7
b7
0
0
b7
b7
0
0
b7
b7
0
0
b7
b7
0
0
b7
b7
0
0
(ADPCM samples in low bits)
(ADPCM samples in low bits)
(Associated Stream bit set)
(Associated Stream bit set)
TSST Grouping on H.110
TSST Grouping on H.110
b6
b6
b6
b6
b6
b6
b6
b6
b6
b6
b6
b6
b6
b6
0
0
0
0
0
0
0
0
0
0
TX Code Point Format
TX Code Point Format
TX PCM Unsigned Mag
TX PCM Unsigned Mag
TX xxPCM Sample
TX xxPCM Sample
b5
b5
b5
b5
b5
b5
b5
b5
b5
b5
b5
b5
b5
b5
1
1
0
0
0
0
0
0
0
0
Figure 64 - Format of TX xxPCM TSSTs
b4
b4
b4
b4
b4
b4
b4
b4
b4
b4
b4
b4
b4
b4
PCM
PCM
1
1
0
0
0
0
0
0
ADPCM 40kbps
ADPCM 40kbps
b3
b3
b3
b3
b3
b3
b3
b3
b3
b3
b3
b3
b3
b3
1
1
0
0
0
0
b2
b2
32kbps
32kbps
b2
b2
b2
b2
b2
b2
b2
b2
b2
b2
b2
b2
1
1
0
0
Zarlink Semiconductor Inc.
24kbps
24kbps
b1
b1
16kbps
16kbps
b1
b1
b1
b1
b1
b1
b1
b1
b1
b1
b1
b1
0
0
b0
b0
b0
b0
b0
b0
b0
b0
b0
b0
b0
b0
b0
b0
0
0
TSSTn
TSSTn
PCM
PCM
PCM
PCM
PCM
PCM
PCM
PCM
PCM
PCM
PCM
PCM
1
1
0
0
0
0
0
0
0
0
0
0
Suppress packet ending with this sample.
Suppress packet ending with this sample.
b7
b7
16kbps
16kbps
b7
b7
b7
b7
b7
b7
b7
b7
b7
b7
b7
b7
(Associated Stream bit cleared)
(Associated Stream bit cleared)
0
0
(ADPCM samples in high bits)
(ADPCM samples in high bits)
24kbps
24kbps
ADPCM 40kbps
ADPCM 40kbps
TSST Grouping on H.110
TSST Grouping on H.110
b6
b6
32kbps
32kbps
b6
b6
b6
b6
b6
b6
b6
b6
b6
b6
b6
b6
TX Code Point Format
TX Code Point Format
0
0
TX xxPCM Sample
TX xxPCM Sample
b5
b5
b5
b5
b5
b5
b5
b5
b5
b5
b5
b5
b5
b5
1
1
0
0
b4
b4
b4
b4
PCM
PCM
b4
b4
b4
b4
b4
b4
b4
b4
b4
b4
1
1
0
0
0
0
b3
b3
b3
b3
b3
b3
b3
b3
b3
b3
b3
b3
b3
b3
1
1
0
0
0
0
0
0
b2
b2
b2
b2
b2
b2
b2
b2
b2
b2
b2
b2
b2
b2
1
1
0
0
0
0
0
0
0
0
b1
b1
b1
b1
b1
b1
b1
b1
b1
b1
b1
b1
b1
b1
0
0
0
0
0
0
0
0
0
0
b0
b0
b0
b0
b0
b0
b0
b0
b0
b0
b0
b0
b0
b0
0
0
0
0
0
0
0
0
0
0
MT92210
119