28500-DSH-002-C_15 Datasheet, PDF (28/224 Pages) M/A-COM Technology Solutions, Inc. – Multichannel Synchronous Communications Controller

Introduction
1.6.5
Line Card SONET/ATM SAR
Figure 1-6 illustrates the Line Card SONET/ATM SAR.
Feature List:
• Higher data aggregation
• Higher number of interfaces
• Chip cost reduced by increasing the number of interfaces serving a large number of logical channels
• Efficient bus occupancy when data is transferred between Link Layer Controller and memory
• Fully independent serial port configuration
• Different types of interfaces handled simultaneously (channelized DS3 and channelized T1/E1)
• 32 independent serial ports
• Conventional mode supported by seven signals (RDAT, RCLK, RSYNC, ROOF, TDAT, TCLK, and TSYNC)
• Local bus architecture
• Per-channel DMA buffer management, linked list data structure handled in local memory
• Increased PCI utilization accomplished by supporting different classes of traffic with fully per-channel
programmable threshold values of internal buffers. These configurable buffer thresholds allow the user to take
advantage of PCI bursts in transferring data between CX28500’s internal memory and shared memory.
Figure 1-6. Line Card SONET/ATM SAR
CPU
PCI
Bridge
Memory
(RAM)
ATM
SAR
CX28233
ATM
PHY With
SONET
Framer
CX28223
DS3
T3
DS3
Quad
T3
DS3/T3
DS3
Framer
T3
DS3
CX28344
T3
CX28500
1024 Channel
HDLC Controller
with Full Duplex
(per Channel) DMA
T1/E1
1
Expansion Bus
Interface
T1/E1
M13
(Mux/Demux)
+
Framers
28
Triple
T3/E3/STS1
LIU
CX28333
Dual
T3/E3/STS1
LIU
CX28332
500052_006
28500-DSH-002-C
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