NXP Semiconductors KMPC852TCVR100A

Overview

KMPC852TCVR100A from Freescale Semiconductor is a PowerPC architecture-based integrated communications processor combining an MPC8xx core, system integration unit (SIU), and communication processor module (CPM) in a single chip. It operates at up to 100 MHz core frequency with 66 MHz external bus, features 1.8-V core / 3.3-V I/O operation with 5-V TTL compatibility, includes a Fast Ethernet controller (FEC), and targets embedded networking applications such as CPE equipment, Ethernet routers, VoIP clients, and WiFi access points.

For engineers reviewing the KMPC852TCVR100A datasheet, KMPC852TCVR100A pinout, KMPC852TCVR100A application, or KMPC852TCVR100A equivalent, this page delivers verified technical context including bus timing constraints, thermal resistance values (RθJA = 49°C/W on single-layer board), DC electrical specs (VDDL: 1.7–1.9 V, VDDH: 3.135–3.465 V), cache configuration (4-Kbyte instruction/data caches, two-way set-associative), and mandatory reset register settings (HRCW[DBGC] = X1, SIUMCR[DBGC] = X1).

Technical Context

The KMPC852TCVR100A implements a single-issue 32-bit MPC8xx core compliant with PowerPC architecture, featuring MMUs with 32-entry fully associative TLBs supporting 4/16/512 Kbyte and 8 Mbyte page sizes, and dual 4-Kbyte instruction/data caches physically addressed with LRU replacement and lockable cache blocks. Its CPM includes an 8-Kbyte dual-port RAM, eight serial DMA channels, and RISC-based communication control for SCCs, SMC, SPI, and PCMCIA interfaces.

Bus operation supports both 1:1 (core = bus) and 2:1 (core = 2× bus) modes - with 50/66 MHz parts supporting both, and 80/100 MHz parts restricted to 2:1 mode only. The SIU provides IEEE 1149.1 JTAG debug interface, software watchdog, periodic interrupt timer, clock synthesizer, and low-power stop mode, while the FEC enables full 10-Mbps IEEE 802.3-compliant Ethernet operation on SCC3/SCC4.

Key Specifications

Pinout & Package

Package: 256-pin PBGA (Plastic Ball Grid Array), 27 mm × 27 mm, 1.27 mm pitch - designed for high-density PCB layouts with four internal power/ground planes recommended per layout guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar integrated communications processor applications.

Compared with KMPC852TCVR100A, MPC852TVR100B offers identical functionality with improved thermal performance in multilayer PCBs, while MPC866PZQ100B extends capabilities with USB and 100-Mbps FEC but removes 5-V tolerant I/O - making it unsuitable for legacy 5-V sensor interfacing without level-shifting.

Availability

KMPC852TCVR100A is available at Aetrix Electronics and suitable for Ethernet router design, VoIP endpoint development, and industrial protocol gateway implementation requiring stable component supply across extended product lifecycles.

Supply support for KMPC852TCVR100A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Freescale Semiconductor (now part of NXP Semiconductors) was a leading designer of embedded processors and analog/mixed-signal ICs, specializing in automotive, industrial, and networking solutions before its 2015 acquisition.

The KMPC852TCVR100A belongs to the PowerQUICC™ family of integrated communications processors, designed specifically for cost-sensitive, low-power embedded networking applications requiring combined CPU, Ethernet, and serial protocol processing in a single die.

FAQ

What is the maximum allowable voltage difference between VDDL and VDDH for KMPC852TCVR100A?

The KMPC852TCVR100A specifies a maximum allowable difference of 100 mV between VDDL and VDDSYN, and mandates that VDDL must never exceed VDDH during power-on reset or power-down sequences. Exceeding this constraint forward-biases internal ESD protection diodes, risking long-term reliability degradation. This requirement is enforced through mandatory voltage sequencing circuits using Schottky diodes as detailed in Figure 3 of the MPC852TEC Rev. 4 specification document for KMPC852TCVR100A.

Does KMPC852TCVR100A support 100-Mbps Ethernet operation?

No, KMPC852TCVR100A supports only 10-Mbps Ethernet operation via its Fast Ethernet Controller (FEC) on SCC3 and SCC4, compliant with IEEE 802.3 at baseband speeds. The hardware specification explicitly states "Ethernet/IEEE 802.3® standard optional on SCC3 and SCC4, supporting full 10-Mbps operation" - no 100-Mbps capability is implemented in the KMPC852TCVR100A's FEC block or associated MII timing parameters.

What are the mandatory reset register configurations required after HRESET assertion for KMPC852TCVR100A?

After HRESET deassertion, KMPC852TCVR100A requires programming SIUMCR[DBGC] = X1 in boot code, and if HRCW is enabled (RSTCONF asserted), HRCW[DBGC] must also be set to X1. Additionally, MBMR[GPLB4DIS] = 0 and specific PAPAR/PADIR, PBPAR/PBDIR, and PCPAR/PCDIR bit fields must be initialized per Table 6 of the MPC852TEC Rev. 4 spec. Failure to configure these registers results in undefined behavior of GPIO and debug functions in KMPC852TCVR100A.

Can KMPC852TCVR100A operate in 1:1 bus mode at 100 MHz core frequency?

No, KMPC852TCVR100A does not support 1:1 bus mode at 100 MHz core frequency. According to Section 2 Features of the MPC852TEC Rev. 4 specification, "80/100 MHz core frequencies support 2:1 mode only." In 2:1 mode, the external bus runs at 50 MHz when the core operates at 100 MHz - a hard architectural limitation confirmed by timing tables and functional descriptions for KMPC852TCVR100A.

What is the purpose of the 8-Kbyte dual-port RAM in KMPC852TCVR100A?

The 8-Kbyte dual-port RAM in KMPC852TCVR100A serves exclusively as local memory for the Communication Processor Module (CPM), enabling concurrent access by the CPM's RISC controller and the main MPC8xx core. This architecture allows the CPM to handle serial frame transmission/reception, HDLC/UART processing, and FEC packet buffering without CPU intervention - reducing latency and freeing the core for application-layer tasks in KMPC852TCVR100A-based systems.