NXP Semiconductors KMC7448VS1400NC

Overview

KMC7448VS1400NC from Freescale Semiconductor is a 1420 MHz PowerPC G4 RISC microprocessor with 32 KB L1 instruction cache, 32 KB L1 data cache, and 1 MB unified on-die L2 cache featuring ECC support. It implements the PowerPC ISA v1.0, includes an AltiVec SIMD unit, double-precision FPU, and supports MPX bus protocol for high-bandwidth system interconnect in networking and computing systems.

For engineers reviewing the KMC7448VS1400NC datasheet, KMC7448VS1400NC pinout, KMC7448VS1400NC application, or KMC7448VS1400NC equivalent, key selection criteria include core frequency (1420 MHz), L2 cache size and ECC capability, dynamic frequency switching (DFS) support, thermal diode integration, and compatibility with 1.5 V / 1.8 V / 2.5 V I/O voltage modes.

Technical Context

The KMC7448VS1400NC implements a seven-stage superscalar pipeline with up to three instructions plus one branch dispatched per cycle, 16-entry completion queue, and out-of-order issue for AltiVec instructions. Its memory subsystem features separate 32-KB eight-way set-associative L1 instruction and data caches with MESI coherency, and an on-chip 1-MB eight-way unified L2 cache supporting programmable write-back/write-through and ECC on data.

It integrates dual MMUs with 128-entry two-way TLBs, hardware-enforced cache coherency, JTAG/COP debug interface, time base counter/decrementer, and dynamic frequency switching (DFS) enabling divide-by-two and divide-by-four core clock reduction. Thermal management includes an integrated temperature diode and Nap/Sleep/Deep Sleep power states.

Key Specifications

Pinout & Package

Package: 360-ball ceramic BGA (HCTE), 27 mm × 27 mm, 1.27 mm pitch, RoHS-compliant lead-free spheres.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar RISC microprocessor applications.

Compared with KMC7448VS1400NC, MPC7447AVS1400N sacrifices L2 ECC and DFS for lower cost and power, while MPC7448VS1600NC trades higher thermal load for increased clock-driven throughput-both share identical software compatibility and pinout, enabling drop-in upgrades or downgrades based on thermal and reliability constraints.

Availability

KMC7448VS1400NC is available at Aetrix Electronics and suitable for telecom line cards, enterprise router control planes, industrial compute appliances, and legacy system emulation platforms requiring stable component supply, long-lifecycle support, and guaranteed traceability.

Supply support for KMC7448VS1400NC 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) is a fabless semiconductor company specializing in embedded processing, connectivity, and analog solutions for automotive, industrial, and networking markets.

The MPC7448 product line was designed as a high-reliability, thermally robust PowerPC G4 implementation targeting carrier-class networking equipment and real-time computing systems requiring ECC, DFS, and deterministic interrupt latency.

FAQ

What is the core supply voltage requirement for stable operation of the KMC7448VS1400NC?

The KMC7448VS1400NC requires a tightly regulated 1.20 V ± 50 mV core supply (VDD) for stable operation at its rated 1420 MHz frequency. This voltage must be sequenced after AVDD and before OVDD per Freescale's power sequencing guidelines; deviation beyond ±50 mV risks timing violations or functional failure. The KMC7448VS1400NC datasheet specifies this value in Table 4 under "Recommended Operating Conditions" for the 1420 MHz speed grade.

Does the KMC7448VS1400NC support dynamic frequency switching (DFS), and how is it enabled?

Yes, the KMC7448VS1400NC supports dynamic frequency switching (DFS) in both divide-by-two and divide-by-four modes, controlled via the DFSPR special-purpose register. Software writes to DFSPR trigger immediate core clock scaling without reset or context loss, reducing dynamic power by ~75% or ~94%. The KMC7448VS1400NC implements this feature identically to the MPC7447A but adds DFS support not present in earlier MPC7445/MPC7441 variants.

What package type and pin count does the KMC7448VS1400NC use?

The KMC7448VS1400NC uses a 360-ball ceramic ball grid array (HCTE) package with 27 mm × 27 mm footprint and 1.27 mm pitch. It is RoHS-compliant with lead-free solder spheres. This package matches the MPC7447A and MPC7445, enabling PCB layout reuse across the G4 family. The KMC7448VS1400NC pinout is fully documented in Section 6 ("Pin Assignments") of the MPC7448EC Rev. 4 datasheet.

How does the L2 cache implementation in the KMC7448VS1400NC differ from the MPC7447A?

The KMC7448VS1400NC integrates a 1-MB unified L2 cache with ECC support on data, whereas the MPC7447A provides only 512 KB L2 cache without ECC. Both use eight-way set-associativity and 256-bit interface width, but the KMC7448VS1400NC adds parity on tags and configurable ECC/parity mode-critical for telecom and server applications where silent data corruption must be prevented. This difference is explicitly stated in Table 1 of the MPC7448EC Rev. 4 document.

Is the KMC7448VS1400NC compatible with the MPC7447A pinout and software ecosystem?

Yes, the KMC7448VS1400NC is pin-compatible with the MPC7447A and shares identical PowerPC ISA v1.0 compliance, register set, exception model, and MPX bus timing. Software compiled for MPC7447A runs unmodified on KMC7448VS1400NC. The only hardware-level differences are the larger L2 cache, ECC, DFS, and thermal diode-none affect pin behavior or boot firmware compatibility. This is confirmed in Section 3 of the MPC7448EC Rev. 4 specification.