MT92220BG Zarlink Semiconductor, MT92220BG Datasheet - Page 103

• Manufacturer Part Number: MT92220BG
• Description: Description = 1023 Channel Voice Over IP/AAL2 Processor ;; Package Type = Epbga ;; No. Of Pins = 608
• Manufacturer: Zarlink Semiconductor

Data Sheet
The format of the Payload Type/Marker Bit Table is the following:
xxPCM Info
RX RTP Channel
Structure Address
Entry 0
Entry 1
Entry 254
Entry 255
Note
Field
Field
+7C
+7E
M = ‘0’ & PT = 0x00 (RTP), UDP Payload Len = 0 bytes (UDP)
M = ‘0’ & PT = 0x01 (RTP), UDP Payload Len = 1 bytes (UDP)
M = ‘1’ & PT = 0x7E (RTP), UDP Payload Len = 254 bytes (UDP)
M = ‘1’ & PT = 0x7F (RTP), UDP Payload Len = 255 or more bytes (UDP)
Structure is 128 bytes long and must start on a 128-byte boundary. Each entry contains a
4-bit number used to select one of the 16 RX RTP Channel Structures to continue packet
processing.
+0
+2
b 15
This field contains additional information about PCM and ADPCM connection packets.
It is used to distinguish PCM and ADPCM encoding as well as CN packet.
“0000” = PCM 64 kbps (no law change);
“0001” = ADPCM 40 kbps;
“0010” = ADPCM 32 kbps;
“0011” = ADPCM 24 kbps;
“0100” = ADPCM 16; kbps;
“0101” = CN Packet (one byte, white, internal);
“1000” = PCM 64 kbps (u-law -> A-law);
“1001” = PCM 64 kbps (A-law -> u-law);
“1010” = PCM 64 kbps (A-law -> u-law (except 00h));
“1011” = PCM 64 kbps (u-law -> u-law (except 00h));
“1100” = CN Packet (one/multi byte, white/pink, external);
others = reserved.
This field is a pointer to an RX RTP Channel Structure that will be used to complete
packet processing, sending it either to the TDM bus in PCM or HDLC format, or to an
RX CPU Packet queue. This address points to increments of 32 bytes.
Entry 248
Entry 252
b14
Entry 0
Entry 4
Table 39 - Fields and Description (continued)
b13
Figure 55 - Payload Type/Marker Bit Table
b12
Table 40 - Fields and Description
b11
Entry 249
Entry 253
b10
Entry 5
Entry 1
Zarlink Semiconductor Inc.
b9
b8
Description
b7
Description
Entry 250
Entry 254
Entry 2
Entry 6
b6
b5
b4
b3
Entry 255
Entry 251
b2
Entry 3
Entry 7
b1
b0
MT92220
103