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參數(shù)資料
| 型號(hào)： | MT90520AG |
| 廠商： | ZARLINK SEMICONDUCTOR INC |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | 8-Port Primary Rate Circuit Emulation AAL1 SAR |
| 中文描述： | ATM SEGMENTATION AND REASSEMBLY DEVICE, PBGA456 |
| 封裝： | 35 X 35 MM, 1.27 MM PITCH, PLASTIC, MS-034, BGA-456 |
| 文件頁(yè)數(shù)： | 82/180頁(yè) |
| 文件大?。?/td> | 1736K |
| 代理商： | MT90520AG |
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MT90520
Data Sheet
82
Zarlink Semiconductor Inc.
For ease of programming, it is suggested that consecutive addresses be used. For instance, in a 3-channel VC, the
addresses configured in the Reassembly Circular Buffer Base Address fields should be set to 000h, 001h, and
002h, regardless of the size of the buffers selected. It must be noted that the Reassembly Circular Buffer Base
Address must correspond to the address given within the TDM SDT Reassembly Control Structure (see Figure 13
on page 46) for the chosen TDM channel destination (port- and channel- specific).
Each 16-bit entry in external memory contains a variety of information. Each entry is composed of the fields shown
in Figure 29 and explained in the text below.
Figure 29 - Per-Channel SDT Reassembly Circular Buffer
MF -
multiframe indicator; this bit is used only when a VC is carrying CAS data (if a VC isn’t carrying CAS,
the MF bits are always zero); the MF bit is set in the buffer for every channel of a VC, each time that the SDT
RX_SAR determines the location of the start of the next multiframe
Res -
reserved field; this field always contains a zero
Turn -
this field contains a copy of the two most-significant bits of the SDT RX_SAR write pointer for the VC.
These bits represent the “turn” of the circular buffer and are used by the TDM module for underrun detection.
CAS -
If CAS data is being processed, this field contains the nibble of data which was last received by this
channel (i.e., in the previous multiframe). CAS data is repeated for an entire multiframe (i.e., 24 consecutive
entries in DS1 case; 16 consecutive entries in E1 case).
TDM Byte -
This field contains the TDM data bytes which are extracted from received cells. If dummy cells
have been inserted, this field contains the value of the dummy data programmed by the user.
Buffer Size
Address to External Memory
64 entries
{cb_base_add<1:0>,reassembly_circular_buffer_base_add<11:0>,6’b0}
128 entries
{cb_base_add<0>,reassembly_circular_buffer_base_add<11:0>,7’b0}
256 entries
{reassembly_circular_buffer_base_add<11:0>,8’b0}
512 entries
{reassembly_circular_buffer_base_add<10:0>,9’b0}
1024 entries
{reassembly_circular_buffer_base_add<9:0>,10’b0}
Table 18 - Formation of SDT Reassembly Circular Buffer Base Addresses to External Memory
MF
CAS
TDM Byte
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
Turn
Res
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0 1
0 1
0 1
0 1
0 1
0 1
0 1
0 1
0 1
0 1
0 1
0 1
0 1
0 0
0 0
0 0
0 0
0 0
0 0
0 0
0 0
X X X X
X X X X
X X X X
X X X X
X X X X
X X X X
X X X X
X X X X
X X X X
X X X X
X X X X
X X X X
A B C D
X X X X
X X X X
X X X X
X X X X
X X X X
X X X X
X X X X
X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X
0 0 1 0 1 0 1 0
X X X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X
X X X X X X X X
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MT9072 | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| MT9072AB | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| MT9072AV | Ultraframer DS3/E3/DS2/E2/DS1/E1/DS0 |
| MT90820 | Large Digital Switch |
| MT90820AL | Large Digital Switch |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT90520AG2 | 制造商:Microsemi Corporation 功能描述:ATM SAR 2.048MBPS 2.5V CBR 456BGA - Trays 制造商:Zarlink Semiconductor Inc 功能描述:ATM SAR 2.048MBPS 2.5V CBR 456BGA - Trays |
| MT90528 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:28-Port Primary Rate Circuit Emulation AAL1 SAR |
| MT90528AG | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:28-Port Primary Rate Circuit Emulation AAL1 SAR |
| MT90528AG2 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:28-Port Primary Rate Circuit Emulation AAL1 SAR |
| MT90710 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:High-Speed Isochronous Multiplexer |
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