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參數(shù)資料
| 型號： | MT90883 |
| 廠商： | Zarlink Semiconductor Inc. |
| 英文描述： | TDM to Packet Processors |
| 中文描述： | TDM到分組處理器 |
| 文件頁數(shù)： | 35/97頁 |
| 文件大?。?/td> | 702K |
| 代理商： | MT90883 |
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MT90880/1/2/3
Data Sheet
35
Zarlink Semiconductor Inc.
Figure 17 - Channel and stream order for packet formation
Each packet contains one or more complete TDM frames of data, in sequential order. This groups all the channels
for the first frame, followed by the same set of channels for the subsequent frame, and so on. Partial TDM frames
are not permitted, and each packet starts at the beginning of a new frame. Figure 18 shows the structure of a
packet containing
x
64 Kbs channels, and
n
TDM frames.
5.4.2 Packet Structure
The fixed header at the start of each packet is added by the Packet Transmit block. This consists of up to 64
bytes, containing the Ethernet header, any upper layer protocol headers, and the two byte context descriptor
field (see section below). The header is entirely user programmable, enabling the use of any protocol provided
there are no dynamic fields (i.e. fields that change from packet to packet).
The Packet Transmit block also maintains a "shadow" header for each context. This is used for context
modification, for example addition of deletion of channels. Any header changes required by a context
modification are programmed into the shadow header in advance. When the changes are complete, the
"shadow" header is swapped with the existing header for the first packet containing the new context payload.
Packet Size
The payload and header size must be chosen such that the overall packet size is not less than the Ethernet
standard minimum packet size of 64 bytes. Where this is likely to be the case, the header must be padded (as
shown in Figure 18) to ensure that the packet is large enough. The padding is required in front of the TDM
payload, to ensure that the WAN Transmit block reads packets correctly on reception. This block is given a
pointer to the start of the TDM payload, and then continues to read data until the end of the packet, as indicated
by the packet length.
In applications where large payloads are being used, the payload size must be chosen such that the overall
packet size does not exceed the maximum Ethernet packet size of 1518 bytes (1522 bytes with VLAN tags).
Channel 0
Channel 1
Channel 2
Channel 31
Stream 0
Channel 0
Channel 1
Channel 2
Channel 31
Stream 31
Channel 0
Channel 1
Channel 2
Channel 31
Stream 1
Channel 0
Channel 1
Channel 2
Channel 31
Stream 2
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MT91600 | Programmable SLIC |
| MT91600AN | Programmable SLIC |
| MT91600AN1 | Programmable SLIC |
| MT91600ANR | Programmable SLIC |
| MT91600ANR1 | Programmable SLIC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT90883A | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:TDM to Packet Processors |
| MT90883A/IG | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:TDM to Packet Processors |
| MT90883BP1N | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:TDM to Packet Processors |
| MT90883IG | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:TDM to Packet Processors |
| MT9088IG | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:TDM to Packet Processors |
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