Texas Instruments TMX320C6657CZH

Overview

TMX320C6657CZH from Texas Instruments is a dual-core C66x fixed- and floating-point digital signal processor operating at up to 1.25 GHz per core, delivering 40 GMAC and 20 GFLOP per core. It integrates 1024KB multicore shared memory (MSM SRAM), DDR3-1333 interface, and hardware accelerators including two Viterbi coprocessors and one Turbo decoder, targeting high-throughput real-time signal processing in avionics and medical imaging systems.

For engineers reviewing the TMX320C6657CZH datasheet, TMX320C6657CZH pinout, TMX320C6657CZH application, or TMX320C6657CZH equivalent, this page provides verified technical context, validated pin functions, confirmed use cases in safety-critical embedded systems, and direct alternative part comparisons with documented functional alignment.

Technical Context

The TMX320C6657CZH implements TI's KeyStone multicore architecture with two C66x CorePacs sharing a 1024KB MSM SRAM and unified TeraNet interconnect fabric. Its Multicore Navigator manages 8192 hardware queues for packet-based DMA, enabling zero-overhead data movement between cores, peripherals, and accelerators without CPU intervention.

It features dedicated hardware acceleration for communications workloads: dual VCP2 Viterbi decoders clocked at CPU/3 and a TCP3d Turbo decoder clocked at CPU/2, alongside four-lane SRIO 2.1 (up to 5 GBaud/lane), PCIe Gen2 (2-lane), HyperLink (40 Gbaud), and SGMII Ethernet subsystems - all directly integrated into the on-die interconnect.

Key Specifications

Pinout & Package

TMX320C6657CZH uses a 625-pin flip-chip plastic BGA (CZH package) with 21 mm × 21 mm body size and 0.80 mm pitch. Pin assignments are defined across four quadrants (A–D) and include dedicated balls for DDR3 DQS/DQ/DM, SRIO differential pairs, PCIe SerDes, HyperLink lanes, and core/system clocks.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TMS320C6657GZH, TMX320C6657CZH adds guaranteed operation at –40°C and 100°C with identical performance; versus TMS320C6678ACY, it trades core count for integrated communications accelerators and smaller footprint - critical for SWaP-constrained radar and medical edge devices.

Availability

TMX320C6657CZH is available at Aetrix Electronics and suitable for avionics signal processing, medical imaging reconstruction, and power system protection requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TMX320C6657CZH 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 specializing in analog, embedded processing, and digital signal processing technologies, with over 50 years of leadership in high-reliability DSP innovation.

The TMS320C6657 is part of TI's KeyStone multicore DSP family, designed specifically for deterministic, high-throughput signal processing in safety-critical infrastructure - emphasizing hardware acceleration, memory coherency, and interconnect scalability for radar, comms, and imaging systems.

FAQ

What is the maximum operating frequency of the TMX320C6657CZH?

The TMX320C6657CZH operates at up to 1.25 GHz per C66x core, delivering 40 GMAC and 20 GFLOP per core. This frequency is fully supported under extended temperature conditions (–40°C to 100°C) with appropriate voltage and cooling. The TMX320C6657CZH datasheet specifies 1.25 GHz as the maximum rated speed for this package variant, validated across process corners and voltage tolerances.

Does the TMX320C6657CZH include hardware accelerators for communications protocols?

Yes, the TMX320C6657CZH integrates two VCP2 Viterbi coprocessors and one TCP3d Turbo decoder coprocessor - all clocked independently from the CPU (at CPU/3 and CPU/2 respectively). These accelerators are explicitly documented in the SPRS814C datasheet for offloading convolutional and turbo code decoding in wireless baseband and satellite modem applications, reducing CPU load by up to 35%.

What package type and pin count does the TMX320C6657CZH use?

The TMX320C6657CZH uses a 625-pin flip-chip plastic BGA package (CZH) with 21 mm × 21 mm body size and 0.80 mm ball pitch. Pin assignments are fully detailed in Figures 4-1 through 4-6 and Table 4-2 of the SPRS814C datasheet, including quadrant-specific ball maps and multiplexed function definitions.

How does the TMX320C6657CZH manage memory coherency between its two cores?

The TMX320C6657CZH uses a hardware-based Multicore Shared Memory Controller (MSMC) to manage coherency for the 1024KB MSM SRAM. It implements directory-based cache coherency and supports memory protection units for both MSM SRAM and DDR3_EMIF - ensuring atomic access and preventing race conditions without software locks or cache flush overhead.

Is the TMX320C6657CZH pin-compatible with other C665x family members?

Yes, the TMX320C6657CZH shares identical pinout and package dimensions with TMS320C6655CZH and TMS320C6657GZH - all use the same 625-pin CZH/GZH BGA footprint. However, functionality differs: the TMX320C6657CZH enables both cores and associated accelerators, whereas C6655 variants implement only one core, making them electrically compatible but functionally distinct.