Texas Instruments TMS320C6657CZH25

Overview

TMS320C6657CZH25 from Texas Instruments is a dual-core fixed- and floating-point digital signal processor (DSP) based on the KeyStone multicore architecture, operating at up to 1.25 GHz per core with 40 GMAC and 20 GFLOP peak performance per core. It integrates 1024KB multicore shared memory (MSM SRAM), 32-bit DDR3-1333 interface supporting 4GB addressable space, and hardware accelerators including two Viterbi coprocessors and one Turbo decoder. It is deployed in high-reliability embedded systems such as avionics radar processing and medical imaging subsystems.

For engineers reviewing the TMS320C6657CZH25 datasheet, TMS320C6657CZH25 pinout, TMS320C6657CZH25 application, or TMS320C6657CZH25 equivalent, key selection criteria include dual-C66x core timing compatibility, MSMC memory coherency support, HyperLink interconnect bandwidth, and SRIO 2.1/PCIe Gen2 peripheral integration for real-time signal processing pipelines.

Technical Context

The TMS320C6657CZH25 implements TI's KeyStone architecture centered on TeraNet nonblocking switch fabric, Multicore Navigator for 8192-hardware-queue packet management, and MSMC enabling direct core access to 1MB shared SRAM without consuming TeraNet bandwidth. Its C66x cores execute 8 single-precision floating-point MACs/cycle and support IEEE 754 compliance, double/mixed-precision operations, and 90 new vector-math instructions versus C64x+.

Hardware acceleration is distributed across dedicated coprocessors: two VCP2 units clocked at CPU/3 for convolutional decoding, and one TCP3d unit clocked at CPU/2 for turbo decoding. Memory subsystem includes 32KB L1P/L1D cache per core, 1024KB configurable L2 unified memory/cache, and DDR3 EMIF with ECC support - all managed under a unified memory protection unit (MPU) covering both MSM SRAM and DDR3.

Key Specifications

Pinout & Package

Package: 625-pin flip-chip plastic BGA (CZH), 21 mm × 21 mm, 0.80 mm pitch, RoHS-compliant. Thermal resistance θ_JA = 12.5°C/W (JEDEC standard board).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-core DSP applications.

Compared with TMS320C6657CZH25, the TMS320C6655CZH25 reduces compute density by 50% but maintains identical peripheral bandwidth and thermal profile, while the ADSP-SC589KSWZ-4 trades raw DSP throughput for ARM-based system control and security features - making it preferable for audio-centric or secure edge nodes rather than radar or imaging pipelines.

Availability

TMS320C6657CZH25 is available at Aetrix Electronics and suitable for avionics radar processing, medical imaging reconstruction, and power protection systems requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for TMS320C6657CZH25 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

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and digital signal processing technologies for industrial, automotive, and communications markets.

The TMS320C6657CZH25 belongs to TI's KeyStone multicore DSP product line, designed specifically for high-throughput, low-latency signal processing in safety-critical embedded systems where deterministic performance and hardware-accelerated math are essential.

FAQ

What is the maximum operating frequency of the TMS320C6657CZH25?

The TMS320C6657CZH25 operates at up to 1.25 GHz per C66x core, delivering 40 GMAC (fixed-point) and 20 GFLOP (floating-point) peak performance per core. This frequency is supported across the full extended temperature range (–40°C to 100°C) under specified voltage and cooling conditions, and is validated in TI's SPRS814D production data sheet.

Does the TMS320C6657CZH25 support DDR3 memory with error correction?

Yes, the TMS320C6657CZH25 includes a 32-bit DDR3-1333 interface with built-in ECC support for DRAM. The DDR3 controller implements single-bit error correction and double-bit error detection, ensuring data integrity in mission-critical applications such as medical imaging and avionics systems where uncorrected memory errors are unacceptable.

How many hardware accelerators are integrated into the TMS320C6657CZH25?

The TMS320C6657CZH25 integrates three dedicated hardware accelerators: two Viterbi Coprocessor version 2 (VCP2) units and one Turbo Decoder Coprocessor version 3d (TCP3d). These operate at CPU/3 and CPU/2 clock rates respectively, offloading convolutional and turbo decoding from the main C66x cores to reduce latency in wireless communications and satellite modem applications.

What high-speed serial interfaces does the TMS320C6657CZH25 support?

The TMS320C6657CZH25 supports Serial RapidIO 2.1 (4 lanes, up to 5 GBaud per lane), PCI Express Gen2 (2-lane, up to 5 GBaud per lane), Gigabit Ethernet (SGMII), and HyperLink (40 Gbaud full-duplex). These interfaces enable scalable interconnect to FPGAs, ASICs, and other KeyStone devices without requiring external bridging logic.

Is the TMS320C6657CZH25 pin-compatible with the TMS320C6655CZH25?

Yes, the TMS320C6657CZH25 and TMS320C6655CZH25 share identical CZH package dimensions (21 mm × 21 mm), pin count (625), ball pitch (0.80 mm), and pinout mapping - enabling drop-in replacement in existing PCB designs. However, the dual-core TMS320C6657CZH25 requires additional power sequencing and thermal management due to higher peak power consumption.