Texas Instruments TMS320C6655GZHA

Overview

TMS320C6655GZHA from Texas Instruments is a single-core, 1.25 GHz fixed- and floating-point digital signal processor (DSP) based on the KeyStone multicore architecture. It integrates one C66x DSP CorePac, 1024KB MSM SRAM, 32-bit DDR3-1333 EMIF, dual Viterbi coprocessors, and Turbo decoder coprocessor - enabling real-time baseband processing in wireless infrastructure and medical imaging systems.

For engineers reviewing the TMS320C6655GZHA datasheet, TMS320C6655GZHA pinout, TMS320C6655GZHA application, or TMS320C6655GZHA equivalent, key selection criteria include its 40 GMAC/20 GFLOP per core performance at 1.25 GHz, 625-pin GZH BGA package with 21 mm × 21 mm footprint, HyperLink interconnect for chip-to-chip scalability, and support for RapidIO 2.1, PCIe Gen2, and Gigabit Ethernet SGMII interfaces.

Technical Context

The TMS320C6655GZHA implements TI's KeyStone architecture with a nonblocking TeraNet switch fabric, Multicore Navigator for hardware-accelerated packet-based DMA across 8192 queues, and a Multicore Shared Memory Controller managing 1MB shared SRAM with memory protection. Its C66x core delivers IEEE 754-compliant single/double-precision floating-point operations and 90 new instructions optimized for vector math and signal kernels.

Peripherals include four-lane Serial RapidIO 2.1 (up to 5 GBaud/lane), PCIe Gen2 (1–2 lanes), HyperLink (40 Gbaud full-duplex), SGMII Gigabit Ethernet, 32-bit DDR3-1333 interface with ECC support, and dual McBSPs - all coordinated via centralized power management, boot ROM, and dual PLLs (main + DDR3).

Key Specifications

Pinout & Package

Package: 625-pin Flip-Chip Plastic BGA (GZH), 21 mm × 21 mm, 0.8 mm pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DSP processing applications.

Compared with TMS320C6655GZHA, the TMS320C6657GZHA offers identical pinout and software compatibility with doubled compute resources, while the ADSP-SC589KSWZ-4 provides ARM/DSP heterogeneity at lower peak performance and no HyperLink scalability - making TMS320C6655GZHA optimal for single-core, high-throughput, chip-scalable DSP workloads.

Availability

TMS320C6655GZHA is available at Aetrix Electronics and suitable for power protection systems, avionics and defense platforms, currency inspection equipment, and medical imaging subsystems requiring stable component supply over extended product lifecycles.

Supply support for TMS320C6655GZHA 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 leader specializing in analog, embedded processing, and connectivity technologies, with over 50 years of innovation in DSP and real-time signal processing.

The TMS320C6655GZHA belongs to TI's KeyStone C665x DSP family, designed specifically for high-performance, low-latency signal processing in wireless infrastructure, defense radar, and industrial vision systems requiring deterministic compute and scalable interconnect.

FAQ

What is the maximum operating frequency of the TMS320C6655GZHA?

The TMS320C6655GZHA operates at a maximum core frequency of 1.25 GHz (800 ps cycle time), delivering 40 GMAC and 20 GFLOP performance. This frequency is achieved under recommended operating conditions including proper power supply sequencing, thermal management within –40°C to 100°C ambient, and validated DDR3-1333 interface timing margins. The TMS320C6655GZHA does not support 850 MHz or 1.0 GHz variants - only the 1.25 GHz speed grade is offered in the GZH package.

Does the TMS320C6655GZHA support PCIe Gen2?

Yes, the TMS320C6655GZHA integrates a PCIe Gen2 peripheral supporting 1 or 2 lanes at up to 5 GBaud per lane. It complies with PCI Express Base Specification Revision 2.0 and includes full PHY, data link, and transaction layers. The device requires external AC coupling capacitors and proper reference clock routing (PCIECLKP/PCIECLKN on AD14/AE15) to achieve reliable link training and stable Gen2 operation - no external PCIe switch or bridge IC is needed for endpoint use.

How much on-chip memory does the TMS320C6655GZHA include?

The TMS320C6655GZHA includes 32KB L1 program memory, 32KB L1 data memory, 1024KB L2 unified memory/cache, 1024KB Multicore Shared Memory (MSM SRAM), and 128KB on-chip ROM. All L2 and MSM memories incorporate error detection and correction (ECC), and the MSM SRAM is protected by a dedicated memory protection unit (MPU). No external SRAM is required for basic boot and real-time kernel execution.

What interfaces does the TMS320C6655GZHA provide for external memory expansion?

The TMS320C6655GZHA provides two external memory interfaces: a 32-bit DDR3-1333 EMIF supporting up to 4GB addressable space with ECC DRAM support, and a 16-bit asynchronous EMIF (EMIF16) for NOR/NAND flash, SRAM, or FPGA glue logic. The DDR3 interface uses differential clocks (DDRCLKP/DDRCLKN on A22/B22) and requires strict layout rules for signal integrity at 1333 MHz data rates.

Is the TMS320C6655GZHA pin-compatible with the TMS320C6657GZHA?

Yes, the TMS320C6655GZHA and TMS320C6657GZHA share identical 625-pin GZH BGA packaging, mechanical footprint (21 mm × 21 mm), and pinout - enabling drop-in replacement on the same PCB. Both devices use identical power, clock, reset, and interface signaling. The only functional difference is the presence of a second C66x CorePac and associated resources in the C6657; unused pins remain reserved or NC in the C6655 configuration.