MPC855TCVR50D4

Microprocessors Overview

The MPC855TCVR50D4 is a communications controller from the MPC8xx family, manufactured by NXP USA Inc. It integrates an embedded MPC8xx core operating at 50 MHz, delivering approximately 106 MIPS. The device features a dedicated Fast Ethernet controller supporting 10/100-Mbps connectivity and an ATM subsystem compliant with UNI 4.0 specifications. Key architectural components include a Communications Processor Module (CPM) with QMC multichannel protocol support, a System Integration Unit (SIU), and memory controllers for DRAM and SRAM. The processor operates at 3.3V and utilizes a 357-pin BGA package.

Microprocessors Feature Summary

• Integrates a high-performance embedded MPC8xx core with 4-Kbyte instruction and data caches for general-purpose processing.
• Includes a dedicated Fast Ethernet controller with bursting DMA to reduce bus utilization and handle collision management independently.
• Supports Asynchronous Transfer Mode (ATM) via UTOPIA or serial interfaces, featuring AAL5 segmentation and reassembly capabilities.
• Features a Communications Processor Module (CPM) with QMC multichannel protocol support for processing multiple TDM channels.

Microprocessors Applications

• SOHO routers
• ADSL modems
• Cable modems

Microprocessors Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific suffix 'CVR50D4' matches the required pinout, temperature range, and packaging specifications against the official datasheet. Ensure compliance with RoHS directives if applicable to the manufacturing batch. Check for obsolescence notices as this product belongs to a legacy architecture.

Microprocessors Selection Notes

Select this component for cost-sensitive networking applications requiring integrated Ethernet and ATM capabilities. The dual-processor architecture separates communication tasks from application logic, optimizing system performance. Consider the 357-pin BGA package constraints during PCB layout. Evaluate power management requirements against the available low-power modes such as doze, sleep, and stop states.

Microprocessors Part Context

This part belongs to the MPC8xx family of microprocessors and controllers, originally developed by Freescale Semiconductor and now managed by NXP Semiconductors. The MPC855T variant specifically targets entry-level networking and telecommunications equipment. It shares architectural similarities with the MPC860T but offers a simplified peripheral set optimized for lower-cost implementations.

Microprocessors Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Consult NXP technical support for current alternatives within the MPC8xx lineage or newer PowerQUICC series processors.