參數(shù)資料
型號(hào): MT92220
廠商: ZARLINK SEMICONDUCTOR INC
元件分類: 數(shù)字傳輸電路
英文描述: 1023 Channel Voice Over IP/AAL2 Processor
中文描述: ATM NETWORK INTERFACE, PBGA608
封裝: 31 X 31 MM, 2.50 MM HEIGHT, MS-034, EPBGA-608
文件頁(yè)數(shù): 43/210頁(yè)
文件大?。?/td> 1536K
代理商: MT92220
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Data Sheet
MT92220
43
Zarlink Semiconductor Inc.
Figure 21 - Tx Flow 2
Once written in the Packet Assembly Control & Data FIFOs, the packets are read out by one of two processes
depending on their nature: AAL2 packets are read by the TX AAL2 VC process. This process associates the packet
to a TX AAL2 VC Structure and assembled AAL2 cells with these packets. Any complete AAL2 cells are then
written to their eventual destination: the destination is contained in the TX AAL2 VC structure. The payload of the
cells is written into the Raw Cell Buffer, while the Raw Cell Pointers are written into one of the 6 TX Link Raw Cell
Buffer Pointers, the RX CPU Raw Cell Buffer Pointers (for internal diagnostic), or the RX AAL2 Raw Cell Buffer
Pointers (for internal loopback).
RTP packets will be read by the Assembly Copying Process that then writes the packets into their destination
buffer. The payload of RTP packets is written into the Network Packet Buffer, while the handle to the packet is
written into one of 6 destinations: one of the 4 TX Link Packet Buffer Handles, the Network CPU Packet Buffer
Handles (for internal diagnostic), or the Packet Identifier Buffer Handles (for internal loopback).
Process
TXTDM4
TXCIRC5
TXCIRC4
channel) TXTDM5
channel) TXTDM6
EVENTQ0-7
Process
Table) SERVTIM1
Assembly
global) SERVTIM0
ASSEM0-1
SILENCE0
ASSEM2-5
ASSEM 6-7
IP Address pair)
packet complete
Connection Structure or TX RTP Connection Structure, indicating that a packet should be sent to the network.
synchronously with the H.110 bus and generates assembly events when enough payload is present to assemble a complete packet.
suppression on xxPCM data.
CPU RTP-AAL2 packet injection:
Software process that copies packets to be sent into SSRAM, then injects a send event into the Event Queue.
managed)
injection
Treatment
entry per stream)
(1 per Stream)
(1 per Bearer)
entry per HDLC
entry per HDLC
Queue (global)
Indicator
(1 entry per
Packet
Table (up to 16,
Connection)
PCM channel)
Connection)
Connection)
HDLC Packet
HDLC Stream to
HDLC Address
LUT Structure (1
TX HDLC
Circular Buffer
TX xxPCM
Circular Buffer
HDLC Address
LUT (RTP) (1
HDLC Address
LUT (AAL2) (1
Assembly Event
Service
Service Indicator
Control Memory
Service Indicator
TX RTP Connection
Structure (1 per
TX Silence
Suppression
Structure (1 per
TX RTP Header
Structure (1 per
TX AAL2
Connection
Structure (1 per
Identification
Counter Source
(1 per SRC/DST
Event indicating HDLC
HDLC Packet Treatment Process:
When an HDLC packet completes, this process will generate an event pointing to the correct TX AAL2
Service Indicator Process:
Schedules the Assembly of RTP and AAL2 xxPCM packets. The service timer reads the Service Indicator Tables
Packet Assembly:
Based on assembly events, generates RTP and AAL2 packets and all the appropriate headers as well. Also performs silence
TX CPU
Packets (CPU-
CPU RTP-
AAL2 packet
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