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SM320C6455-EP

FIXED-POINT DIGITAL SIGNAL PROCESSOR

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SPRS462B – SEPTEMBER 2007 – REVISED JANUARY 2008

The C64x+ DSP core employs eight functional units, two register files, and two data paths. Like the earlier C6000 devices, two of these eight functional units are multipliers or .M units. Each C64x+ .M unit doubles the multiply throughput versus the C64x core by performing four 16 bit x 16 bit multiply-accumulates (MACs) every clock cycle. Thus, eight 16 bit x 16 bit MACs can be executed every cycle on the C64x+ core. At a 1.2-GHz clock rate, this means 9600 16 bit MMACs can occur every second. Moreover, each multiplier on the C64x+ core can compute one 32 bit x 32 bit MAC or four 8 bit x 8 bit MACs every clock cycle.

The C6455 device includes Serial RapidIO. This high bandwidth peripheral dramatically improves system performance and reduces system cost for applications that include multiple DSPs on a board, such as video and telecom infrastructures and medical/imaging.

The C6455 DSP integrates a large amount of on-chip memory organized as a two-level memory system. The level-1 (L1) program and data memories on the C6455 device are 32KB each. This memory can be configured as mapped RAM, cache, or some combination of the two. When configured as cache, L1 program (L1P) is a direct mapped cache where as L1 data (L1D) is a two-way set associative cache. The level 2 (L2) memory is shared between program and data space and is 2096KB in size. L2 memory also can be configured as mapped RAM, cache, or some combination of the two. The C64x+ Megamodule also has a 32 bit peripheral configuration (CFG) port, an internal DMA (IDMA) controller, a system component with reset/boot control, interrupt/exception control, a power-down control, and a free-running 32 bit timer for time stamp.

The peripheral set includes: an inter-integrated circuit bus module (I2C); two multichannel buffered serial ports (McBSPs); an 8 bit Universal Test and Operations PHY Interface for Asynchronous Transfer Mode (ATM) Slave [UTOPIA Slave] port; two 64 bit general-purpose timers (also configurable as four 32 bit timers); a user-configurable 16 bit or 32 bit host-port interface (HPI16/HPI32); a peripheral component interconnect (PCI); a 16-pin general-purpose input/output port (GPIO) with programmable interrupt/event generation modes; an 10/100/1000 Ethernet media access controller (EMAC), which provides an efficient interface between the C6455 DSP core processor and the network; a management data input/output (MDIO) module (also part of the EMAC) that continuously polls all 32 MDIO addresses in order to enumerate all PHY devices in the system; a glueless external memory interface (64 bit EMIFA), which is capable of interfacing to synchronous and asynchronous peripherals; and a 32 bit DDR2 SDRAM interface.

The I2C ports on the C6455 allow the DSP to easily control peripheral devices and communicate with a host processor. In addition, the standard multichannel buffered serial port (McBSP) may be used to communicate with serial peripheral interface (SPI) mode peripheral devices.

The C6455 device has two high-performance embedded coprocessors [enhanced Viterbi Decoder Coprocessor (VCP2) and enhanced Turbo Decoder Coprocessor (TCP2)] that significantly speed up channel-decoding operations on-chip. The VCP2 operating at CPU clock divided-by-3 can decode over 694 7.95-Kbps adaptive multi-rate (AMR) [K = 9, R = 1/3] voice channels. The VCP2 supports constraint lengths K = 5, 6, 7, 8, and 9, rates R = 3/4, 1/2, 1/3, 1/4, and 1/5 and flexible polynomials, while generating hard decisions or soft decisions. The TCP2 operating at CPU clock divided-by-3 can decode up to fifty 384-Kbps or eight 2-Mbps turbo encoded channels (assuming 6 iterations). The TCP2 implements the max*log-map algorithm and is designed to support all polynomials and rates required by Third-Generation Partnership Projects (3GPP and 3GPP2), with fully programmable frame length and turbo interleaver. Decoding parameters such as the number of iterations and stopping criteria are also programmable. Communications between the VCP2/TCP2 and the CPU are carried out through the EDMA3 controller.

The C6455 has a complete set of development tools which includes: a new C compiler, an assembly optimizer to simplify programming and scheduling, and a Windows® debugger interface for visibility into source code execution.

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