參數(shù)資料
型號(hào)： 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(dòng)柜員機(jī)AAL1特區(qū)（多通道自動(dòng)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)： 67/159頁
文件大?。?/td> 514K
代理商： MT90500
MT90500
67
4.5.4
Non-CBR Data Cell Reception Ability
As mentioned above, the MT90500 is capable of receiving non-CBR data cells as well as CBR cells. Non-CBR
cells can be received on the UTOPIA bus and written into the user-defined Receive Data Cell FIFO in external
memory, where they wait for the CPU to read them.
There are 3 ways for cells to be identified as data cells. First of all, OAM cells may be treated as non-CBR cells
if the OAM Routing Select bit in the UTOPIA Control Register (address 4000h, bit<5>) is set to 1. Secondly,
unknown cells may be considered as non-CBR cells if the Unknown Routing Select bit (bit<6> of the UTOPIA
Control Register) is set to 1. Finally, normal cells whose VPI and VCI values correspond to those in the VPI and
VCI Match Registers located at 4012h and 4016h respectively, can be tagged as data if their entry in the look-
up table is associated with a non-CBR entry.
To write into the Receive Data Cell FIFO, the chip will use the Receive Data Cell FIFO Base Address Register
(address 4020h) and will write into the next available entry as tagged by the Receive Data Cell FIFO Write
Pointer Register (address 4022h), regardless of the value in the RX Structure Address field of the look-up table
entry. Once this is done, the write pointer will be incremented.
Finally, the CPU should read the data contained in the FIFO once the write pointer becomes greater than the
read pointer. To do so, the CPU should access each of the 24 word entries corresponding to that cell (24 words
* 2 bytes = 48 bytes, max. cell payload). Once it has completed its task, the read pointer should be incremented
to ensure the hardware knows the cell has been read.
RX Structure Address (can be ignored)
0
31
01
2
R R
R
18
16 15
(LUTBASE + “00000”) + VPVCC
T = “01” indicates a non-CBR data cell
T = Entry Type (refer to Figure 27, “MT90500 Cell Receive Process,” on
page 66 for details for non-data cells)
R = Reserved (should be set to all zeroes)
Figure 28 - Look-up Table Non-CBR Data Entry
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）)
MT90732AP Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
MT90732 Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0
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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