MT92220 Zarlink Semiconductor, MT92220 Datasheet - Page 53

• Manufacturer Part Number: MT92220
• Description: 1023 Channel Voice Over IP/AAL2 Processor
• Manufacturer: Zarlink Semiconductor

Data Sheet
6.4
Before the CRC is performed on the identification key, a mask will be applied to it, depending on the profile used to
search for the packet. This mask prevents certain values from being included in the final identification key. For
example, if a profile wants to search for packets using only the IP source and destination addresses and the UDP
source and destination ports, but not the SSRC, then dword 3 of the identification key will be masked out and the
others will be allowed to pass. The mask used with each profile is contained in the Profile Memory, whose format is
the following:
+1C
+1C
+10
+10
+14
+14
+18
+18
+20
+20
+24
+24
+C
+C
+C
+C
+C
+C
+0
+0
+4
+4
+8
+8
+0
+0
+4
+4
+8
+8
+0
+0
+4
+4
+8
+8
Masking
b31
b31
b31
b31
b31
b31
b30
b30
b30
b30
b30
b30
b29
b29
b29
b29
b29
b29
First word of IP Payload - UDP Source Port [15:0]
First word of IP Payload - UDP Source Port [15:0]
First word of IP Payload - UDP Source Port [15:0]
First word of IP Payload - UDP Source Port [15:0]
b28
b28
b28
b28
Format 3 - AAL5 Null Encapsulation with RTP, AAL5 raw packets, MPLS Look-up, MPOA look-up (Length = 4)
Format 3 - AAL5 Null Encapsulation with RTP, AAL5 raw packets, MPLS Look-up, MPOA look-up (Length = 4)
b28
b28
b27
b27
b27
b27
b27
b27
b26
b26
b26
b26
b26
b26
b25
b25
b25
b25
b25
b25
Figure 27 - Identification Key Formats (before CRC)
b24
b24
b24
b24
b24
b24
b23
b23
b23
b23
b23
b23
b22
b22
b22
b22
b22
b22
Third dword of packet - SSRC [31:0] / ELAN-ID [31:0]
Third dword of packet - SSRC [31:0] / ELAN-ID [31:0]
b21
b21
b21
b21
b21
b21
Third Dword of UDP Payload - SSRC [31:0]
Third Dword of UDP Payload - SSRC [31:0]
Third Dword of UDP Payload - SSRC[31:0]
Third Dword of UDP Payload - SSRC[31:0]
b20
b20
b20
b20
Format 1 - IPv4, UDP, RTP (Length = 4)
Format 1 - IPv4, UDP, RTP (Length = 4)
b20
b20
Format 2 - IPv6, UDP, RTP (Length = 10)
Format 2 - IPv6, UDP, RTP (Length = 10)
Zarlink Semiconductor Inc.
b19
b19
b19
b19
Destination IP Address [127:96]
Destination IP Address [127:96]
b19
b19
Destination IP Address [95:64]
Destination IP Address [95:64]
Destination IP Address [63:32]
Destination IP Address [63:32]
Destination IP Address [31:0]
Destination IP Address [31:0]
Destination IP Address [31:0]
Destination IP Address [31:0]
Source IP Address [127:96]
Source IP Address [127:96]
Source IP Address [95:64]
Source IP Address [95:64]
Source IP Address [63:32]
Source IP Address [63:32]
Source IP Address [31:0]
Source IP Address [31:0]
Source IP Address [31:0]
Source IP Address [31:0]
b18
b18
b18
b18
b18
b18
MPLS Shim [19:0]
MPLS Shim [19:0]
b17
b17
MPOA Tag [31:0]
MPOA Tag [31:0]
b17
b17
b17
b17
b16
b16
b16
b16
b16
b16
b15
b15
b15
b15
b15
b15
b14
b14
b14
b14
b14
b14
Flow Table Bit Pointer [23:0]
Flow Table Bit Pointer [23:0]
Second word of IP Payload - UDP Destination Port [15:0]
Second word of IP Payload - UDP Destination Port [15:0]
Second word of IP Payload - UDP Destination Port [15:0]
Second word of IP Payload - UDP Destination Port [15:0]
b13
b13
b13
b13
b13
b13
b12
b12
b12
b12
b12
b12
b11
b11
b11
b11
b11
b11
b10
b10
b10
b10
b10
b10
b9
b9
b9
b9
b9
b9
b8
b8
b8
b8
b8
b8
b7
b7
b7
b7
b7
b7
b6
b6
b6
b6
b6
b6
b5
b5
b5
b5
b5
b5
b4
b4
b4
b4
b4
b4
b3
b3
b3
b3
b3
b3
b2
b2
b2
b2
b2
b2
MT92220
b1
b1
b1
b1
b1
b1
b0
b0
b0
b0
b0
b0
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