MT92220BG Zarlink Semiconductor, MT92220BG Datasheet - Page 83

• 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 TX RTP header structure is the following:
IPv6
IDE
Identification Counter
Source Address
RTD
Field
+A
+C
+6
+8
+0
+2
+4
IPv6
b15
8P
Minimum Total Packet Length [7:0]
b14
IDE
UDP Header Start [9:2]
802.3 Length Adjust [6:0]
ID v6 Position [9:2]
b13
This bit must set when the IP version for this connection is 6.
Identification Enable. When ‘1’ the identification dword will be written in the
packet. When ‘0’, the identification dword will be set to an undefined value if it
is present in the headers. IDE should be set when an IPv4 header is present or
when an IPv6 fragmentation header is present.
Points to a 4-byte field in the lower 64K of SSRAM A which will be read as the
identification field that is to be inserted in the packet. When the IDE bit is set,
this 32-bit counter will be incremented and written back to memory. In IPv4
only, the bottom 16 bits of this 32-bit identification counter will be written in the
IPv4 header. This field is ignored when the IDE field is zero.
Routing Destination. This field indicates when packet generated with this
header structure should be set. Multicast destinations are supported through
an ORed combination of the following individual destinations. However, when
packets are sent to the Packet Identifier, they cannot be sent anywhere else.
“000000000” = Delete;
“1xxxxxxxx” = reserved;
“x1xxxxxxx” = TX Link A HP;
“xx1xxxxxx” = TX Link A LP;
“xxx1xxxxx” = TX Link B LP;
“xxxx1xxxx” = TX Link B HP;
“xxxxx1xxx” = reserved;
“xxxxxx1xx” = Network CPU Packet Buffer;
“xxxxxxx1x” = reserved;
“000000001” = Packet Identifier.
b12
Figure 46 - TX RTP Header Structure
Table 35 - Fields and Description
RTD
b11
Identification Counter Source Address [15:2]
b10
Zarlink Semiconductor Inc.
b9
Header Word N-1
Header Word 0
b8
b7
802.3 Length Position [7:0]
b6
Link Header Length [7:0]
Header Length [9:2]
Description
b5
b4
b3
Packet Type
b2
b1
b0
MT92220
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