MT92220BG Zarlink Semiconductor, MT92220BG Datasheet - Page 104

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

104
RTP connections can generate Event Reports when special events or errors occur. These Event Reports indicate
all UDP and RTP packaging errors encounters while parsing the packet. This includes fatal errors like UDP
Checksum Error, RTP Version Mismatch and Bad packet Length 1 (which indicates that the RTP headers were too
long for the packet length). It also reports structure Initialization, RTP packet Loss (detected through the sequence
numbers) and Payload Type Report, which is set when the Report bit associated to the RX RTP Channel Structure
is set. This structure reports the current packet's sequence number and the sequence number of the previous
received packet (when RTP is enabled), as well as the Payload Type and Marker bit for RTP packets or the UDP
Payload Length for UDP-only packets. The current Local Bus Timestamp is also written in the structure.
These errors are documented in the following figure that gives the format of these events:
+C
+A
+E
Figure 56 - RX Disassembly Event Report Queue - RTP Connection Report
+0
+2
+4
+6
+8
b15
M
b14
b13
Payload Type [6:0]
b12
I
RX RTP Connection Base Address [20:5]
Previous RTP Sequence Number [15:0]
b11
L
This RTP Sequence Number [15:0]
Local Bus Time Stamp [31:16]
b10
Local Bus Time Stamp [15:0]
Zarlink Semiconductor Inc.
b9
R
BL1
b8
b7
RVM UCE
UDP Payload Length [7:0]
b6
b5
b4
b3
0
b2
0
b1
0
b0
1