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MT90520AG Datasheet

  • MT90520AG

  • 8-Port Primary Rate Circuit Emulation AAL1 SAR

  • 180頁

  • ZARLINK   ZARLINK

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MT90520
8-Port Primary Rate
Circuit Emulation AAL1 SAR
Data Sheet
Features
鈥?/div>
AAL1 Segmentation and Reassembly device
compliant with Circuit Emulation Services (CES)
standard (af-vtoa-0078.000)
Supports both Unstructured and Structured
Circuit Emulation of 8 independent DS1/E1/ST-
BUS interfaces
Supports AAL1 trunking, with up to 128 TDM
channels per VC (af-vtoa-0089.001)
Supports CAS transmission and reception in all
structured modes of operation
Supports simultaneous processing of up to 256
bidirectional Virtual Circuits
Supports mixed DS1/E1 operation
Supports mixed Unstructured and Structured CES
operation
Fully flexible DS0 assignment
Complete clock recovery solution provided on-
chip: Synchronous, Adaptive, or Synchronous
鈥?/div>
鈥?/div>
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VC Look-Up
Table
January 2004
Ordering Information
MT90520AG 456 Pin Plastic BGA
-40 to +85擄C
Residual Time Stamp (SRTS) via 8 independent
PLLs
鈥?/div>
Dual-mode (ATM-end or PHY-end) UTOPIA port
operates in Level 1 or Level 2 mode for
connection to external PHY or ATM devices with
UTOPIA clock rate up to 52 MHz
TDM bus provides 8 bidirectional serial streams
at 1.544, 2.048, or 4.096 MHz - compatible with
Generic (1.544 Mbps or 2.048 Mbps) and ST-
BUS (2.048 Mbps) interfaces
Supports master and slave TDM backplane bus
clock operation
Supports TDM and UTOPIA loopback functions
16-bit microprocessor port, configurable to
Motorola or Intel timing
Master clock rate of 66.0 MHz
External
Synchronous
SRAM (ZBT)
鈥?/div>
鈥?/div>
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鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Segmentation / Reassembly
Circular Buffers
MT90520
UTOPIA
OUTPUT
BLOCK
TX
SAR
External Memory Controller
Tx/Segmentation (X 8)
TDM
INPUT
BLOCK
Clock
Management
TDM Input
Interface
Clock Control
/Recovery
Interface
TDM Output
Interface
Local
Memory
UTOPIA
Interface
UTOPIA
INPUT
BLOCK
RX SARs
(UDT, SDT,
Data)
Local
Memory
PLL
TDM
OUTPUT
BLOCK
Rx/Reassembly (X 8)
Boundary-
Scan Logic
Microprocessor
Interface Logic
JTAG
Interface
16-bit Microprocessor
Interface
Figure 1 - MT90520 Block Diagram
1
Zarlink Semiconductor Inc.
Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc.
Copyright 2002-2004, Zarlink Semiconductor Inc. All Rights Reserved.

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