TMS320C6655CZH TI TMS320C66x Single-Core Fixed/Floating-Point DSP 1.25GHz DDR3 PCIe SRIO FCBGA-625

TMS320C6655CZH Product Overview

The TMS320C6655CZH is a high-performance single-core fixed/floating-point digital signal processor (DSP) from Texas Instruments (TI), based on the KeyStone architecture in an FCBGA-625 package, running at up to 1.25GHz. The TMS320C6655CZH is the mainstream single-core model in the C66x family, with each C66x CorePac executing up to 8 instructions per cycle, delivering 40 GMAC of fixed-point performance and 20 GFLOP of single-precision floating-point performance, with native support for double-precision floating-point operations. On-chip memory of the TMS320C6655CZH includes 1MB L2 SRAM with 32KB L1P/32KB L1D caches, paired with a 32-bit DDR3-1600 EMIF providing up to 12.8GB/s of external memory bandwidth. The TMS320C6655CZH features industry-leading high-speed interconnect: PCI Express Gen2 (5GT/s), Serial RapidIO 2.0 (5Gbps), HyperLink chip-level interconnect, and a Gigabit Ethernet (GbE) switch, offering exceptional flexibility in multi-processor collaboration, high-speed data transfer, and board-level communication. Additional peripherals include UART, SPI, I2C, McBSP, and general-purpose I/O. The TMS320C6655CZH is ideal for applications such as communication base stations, radar/electronic warfare, medical imaging, industrial machine vision, and high-performance computing accelerator cards that require a single high-performance DSP. Leveraging TI's mature KeyStone software ecosystem and Code Composer Studio IDE, multi-core communication and algorithm deployment are efficient and streamlined on the TMS320C6655CZH.

TMS320C6655CZH Core Features

Processor Core: The TMS320C6655CZH features a single TMS320C66x fixed/floating-point DSP, up to 1.25GHz, 8 instructions/cycle, 40 GMAC/20 GFLOP, double-precision floating-point support

On-Chip Memory: The TMS320C6655CZH provides 32KB L1P + 32KB L1D + 1MB L2 SRAM, configurable as cache/RAM mix

External Memory Interface: The TMS320C6655CZH includes a 32-bit DDR3-1600 EMIF (up to 12.8GB/s), ECC support

High-Speed Serial Interfaces: The TMS320C6655CZH integrates 1× PCI Express Gen2 (single lane, 5GT/s), 1× Serial RapidIO 2.0 (4 lanes, up to 20Gbps), 1× HyperLink (50Gbaud chip-level interconnect)

Network Interface: The TMS320C6655CZH offers a Gigabit Ethernet (GbE) switch, supporting 10/100/1000 Mbps and SGMII

Other Peripherals: The TMS320C6655CZH includes 2× UART, 2× SPI, 2× I2C, McBSP, 16-bit Host-Port Interface (HPI)

System Management: The TMS320C6655CZH features on-chip PLL, watchdog timer, multiple DMA channels, power management module

Power & Package: The TMS320C6655CZH operates with core voltage 1.0V, I/O voltage 1.8V/3.3V; FCBGA-625 package (0.8mm pitch), industrial temperature grade options available

TMS320C6655CZH Applications

Wireless Communication Base Stations: The TMS320C6655CZH handles LTE/5G physical layer processing, baseband co-processing, CFR/DPD linearization

Radar & Electronic Warfare: The TMS320C6655CZH executes pulse compression, beamforming, SIGINT, electronic countermeasures

Medical Imaging: The TMS320C6655CZH accelerates CT/MRI image reconstruction, ultrasound beamforming, digital pathology scanning

Industrial Machine Vision: The TMS320C6655CZH performs high-speed image acquisition and pre-processing, defect detection, robot navigation

High-Performance Computing Acceleration: The TMS320C6655CZH enables PCIe accelerator cards, software-defined radio, financial computing, scientific simulation

TMS320C6655CZH Key Advantages

Single-Core Extreme Performance: The TMS320C6655CZH's 1.25GHz C66x core delivers 40 GMAC/20 GFLOP of powerful hybrid fixed/floating-point computation, enabling a single chip to handle complex physical layer algorithms or image processing pipelines.

Industry-Leading Interconnect: Integrated PCIe Gen2, SRIO 2.0, HyperLink, and Gigabit Ethernet allow the TMS320C6655CZH to seamlessly connect to high-speed backplanes or form heterogeneous computing clusters with FPGAs and other DSPs.

High-Bandwidth DDR3 EMIF: The TMS320C6655CZH's 32-bit DDR3-1600 interface with ECC provides a reliable high-speed memory channel for data-intensive applications, significantly reducing external memory bottlenecks.

KeyStone Architecture Benefits: Shared memory and efficient internal bus structure of the TMS320C6655CZH offer a smooth software migration path to multi-core DSPs (such as C6657/C6678), protecting customer investment.

Mature Tools & Software Support: The free MCSDK provides SYS/BIOS RTOS, NDK networking stack, and optimized DSP function libraries, helping engineers quickly build complex systems around the TMS320C6655CZH and shorten time-to-market.

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FAQ

1. How does the TMS320C6655CZH differ from the TMS320C6657?
   
   • The TMS320C6655CZH is a single-core DSP, while the TMS320C6657 is a dual-core DSP; both are pin- and package-compatible.
   • The TMS320C6655CZH provides one C66x core for high-performance single-thread processing; the C6657 provides two cores for parallel or multi-tasking applications.
2. What is the fixed- and floating-point performance of the C66x core?
   
   • At 1.25GHz, the TMS320C6655CZH delivers 40 GMAC of fixed-point performance and 20 GFLOP of single-precision floating-point performance, with native double-precision floating-point support.
   • This enables the TMS320C6655CZH to efficiently handle diverse workloads such as communication baseband, image processing, and scientific computing on a single DSP.
3. What high-speed interconnect interfaces does it support?
   
   • The TMS320C6655CZH supports PCI Express Gen2 (single lane), Serial RapidIO 2.0 (4 lanes, 20Gbps total), HyperLink chip-level interconnect, and Gigabit Ethernet.
   • These interfaces enable the TMS320C6655CZH to easily connect to FPGAs, external host processors, or multi-DSP high-speed data streaming systems.
4. What is the DDR3 bandwidth? Does it support ECC?
   
   • The TMS320C6655CZH integrates a 32-bit DDR3-1600 EMIF with a maximum bandwidth of 12.8GB/s.
   • The interface supports ECC error correction, making it suitable for communication and industrial applications requiring high data integrity.
5. What modes does the Gigabit Ethernet support? Can it be used for industrial protocols like EtherCAT?
   
   • The internal GbE switch of the TMS320C6655CZH supports 10/100/1000 Mbps and SGMII interfaces.
   • Industrial Ethernet protocols such as EtherCAT and Profinet can be implemented via software, though third-party or custom protocol stacks may be required.
6. What tools and software are needed for development?
   
   • Use TI's free Code Composer Studio (CCS) IDE for development and debugging of the TMS320C6655CZH.
   • Hardware debuggers such as the XDS560v2 or XDS200 series are recommended, supporting JTAG in-circuit programming and real-time debugging for the TMS320C6655CZH.
   • TI provides the MCSDK development kit, including SYS/BIOS RTOS, NDK networking stack, and extensive optimized DSP libraries for the TMS320C6655CZH.
7. What boot modes does the chip support?
   
   • The TMS320C6655CZH supports booting from SPI NOR Flash, I2C EEPROM, Gigabit Ethernet (GbE), PCIe, and EMIF, among others.
   • Flexible boot modes accommodate different system design requirements and simplify firmware update processes.
8. What is the power consumption of the TMS320C6655CZH? Does it require a heatsink?
   
   • Full-speed power consumption of the TMS320C6655CZH is typically in the 3W-6W range (depending on frequency and temperature); a heatsink is recommended at high clock speeds.
   • The TMS320C6655CZH supports dynamic power management, automatically adjusting power consumption based on load and reducing heat in standby states.
9. Is the FCBGA-625 package difficult to solder?
   
   • The TMS320C6655CZH uses a 0.8mm-pitch flip-chip ball grid array and requires professional reflow equipment and X-ray inspection.
   • Following TI's recommended land pattern and reflow profile, production yields of the TMS320C6655CZH can be reliably maintained.
10. What are the upgrade options if I need more cores?
    
    • Directly upgrade to the pin-compatible TMS320C6657 (dual-core C66x) or TMS320C6678 (8-core C66x) for a smooth performance boost within the same KeyStone architecture.