參數(shù)資料
型號： MT90500
廠商： Mitel Networks Corporation
英文描述： Multi-Channel ATM AAL1 SAR(多通道 ATM AAL1分段及重組設(shè)備（基于通訊總線的系統(tǒng)與ATM網(wǎng)絡(luò)的接口）)
中文描述： 多通道自動柜員機(jī)AAL1特區(qū)（多通道自動柜員機(jī)AAL1分段及重組設(shè)備（基于通訊總線的系統(tǒng)與空中交通管理網(wǎng)絡(luò)的接口））
文件頁數(shù)： 33/159頁
文件大?。?/td> 514K
代理商： MT90500
MT90500
33
4.1.2.5
Local Bus Data Transfer Process
A local bus data transfer process is provided, which allows local serial TDM input (LOCSTi) data to be output
on the main TDM bus (ST[15:0]) in place of the usual data from the internal frame memory. Similarly, data from
the main TDM bus can be routed directly onto the local TDM output (LOCSTo), without affecting the TDM to
internal frame memory transfer.
The local bus pins on the MT90500 are an extension of the main TDM bus. The data on any stream of the main
TDM bus may be passed to the local bus output (LOCSTo). The source pin (one of ST[15:0]) is controlled with
the STi2LOCSTo bits at 6020h, and the time slots to be transferred are indicated by the TDM Bus to Local Bus
Transfer Register (6022h). Note that this TDM data can be from two sources: either externally-sourced data
being driven into the selected ST pin, or data from the ATM link being driven out by the RX_SAR, and copied to
the LOCSTo pin. When fewer than the maximum number of available time slots are transferred between the
main TDM bus and the local bus, the unused LOCSTo output time slots are filled with data fed back internally
from LOCSTi.
Similarly, the data input on LOCSTi may be passed to any stream of the TDM bus as indicated by the Local Bus
to TDM Bus Transfer Register (6024h), and the LOCSTi2STo bits at 6020h. Note that when the local bus to
TDM process is enabled, from 1 to 32 data bytes from the RX_SAR will be replaced by local bus data. The
enable bits for the main TDM bus channels are the normal bits in the Output Enable Registers (7000h + 2N).
Data from the LOCSTi input pin can be transferred to the ATM link through the TX_SAR, by re-sampling the
channels on which the local bus data is output as inputs to the TX_SAR.
4.1.3
TDM Data to External Memory Process
4.1.3.1
General
The segmentation of serial TDM input data into ATM cells starts by copying the TDM data into Transmit Circular
Buffers. The data is then read out of the Transmit Circular Buffers by the TX_SAR (see Section 4.3.2, “TX_SAR
Process,” on page 48). The initial step of copying the serial TDM input data into the Transmit Circular Buffers is
performed by the TDM Data to External Memory Process described in this section.
All of the serial TDM input data available on the TDM buses is first written to an internal frame buffer which
holds 4 frames of TDM data per input channel. As shown in Figure 4, this internal frame memory (which is used
in both the receive and transmit directions simultaneously) is used as a pingpong buffer. While one page of the
memory is being loaded with input TDM data, the other page of the memory is being transferred to the Transmit
Circular Buffers in external memory. This transfer occurs every 500
μ
s (4 frames * 125
μ
s per frame).
TDM Input
Frame Buffer
Internal Memory
TDM Buses
External Memory
Each active DS0
channel occupies a
64-byte Transmit
Circular Buffer.
Figure 4 - TDM Frame Buffer to External Memory Transfer
TXCBBASE (Register 6044h)
TXCBBASE+64
TXCBBASE+128
Tx Circular Buffer 1
Tx Circular Buffer 2
Tx Circular Buffer n-1
Tx Circular Buffer n
Tx Circular Buffer 3
相關(guān)PDF資料
PDF描述
MT90500 Multi-Channel ATM AAL1 SAR
MT90500AL Multi-Channel ATM AAL1 SAR
MT90502 Multi-Channel AAL2 SAR(多通道 ATM AAL2分段及重組設(shè)備（基于通訊總線的系統(tǒng)與ATM網(wǎng)絡(luò)的接口）)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MT90500AL 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Multi-Channel ATM AAL1 SAR
MT90500AL-ENG1 制造商:Mitel Networks Corporation 功能描述:
MT90502 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Multi-Channel AAL2 SAR
MT90502_06 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Multi-Channel AAL2 SAR
MT90502AG 制造商:Rochester Electronics LLC 功能描述: 制造商:Zarlink Semiconductor Inc 功能描述:
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