FIXED-POINT DIGITAL SIGNAL PROCESSORSThe TMS320C64x DSPs (including the TMS320C6414 TMS320C6415 and TMS320C6416 devices) are the
highest-performance fixed-point DSP generation in the TMS320C6000 DSP platform. The TMS320C64x
(C64x) device is based on the second-generation high-performance, advanced VelociTI
very-long-instruction-word (VLIW) architecture (VelociTI.2) developed by Texas Instruments (TI), making
these DSPs an excellent choice for multichannel and multifunction applications. The C64x is a
code-compatible member of the C6000 DSP platform.
With performance of up to 5760 million instructions per second (MIPS) at a Clock rate of 720 MHz, the C64x
devices offer cost-effective solutions to high-performance DSP programming challenges. The C64x DSPs
possess the operational flexibility of high-speed controllers and the numerical capability of array processors.
The C64x DSP core processor has 64 general-purpose Registers of 32-bit word length and eight highly
independent functional unitstwo multipliers for a 32-bit result and six arithmetic Logic units (ALUs) with
VelociTI.2 extensions. The VelociTI.2 extensions in the eight functional units include new instructions to
accelerate the performance in key applications and extend the parallelism of the VelociTI architecture. The
C64x CAN produce four 16-bit multiply-accumulates (MACs) per cycle for a total of 2880 million MACs per
second (MMACS), or eight 8-bit MACs per cycle for a total of 5760 MMACS. The C64x DSP also has
application-specific hardware Logic on-chip memory, and additional on-chip peripherals similar to the other
C6000 DSP platform devices.
The C6416 device has two high-performance embedded coprocessors [Viterbi Decoder Coprocessor (VCP)
and Turbo Decoder Coprocessor (TCP)] that significantly speed up channel-decoding operations on-chip. The
VCP operating at CPU Clock divided-by-4 CAN decode over 600 7.95-Kbps adaptive multi-rate (AMR) [K = 9,
R = 1/3] voice channels. The VCP supports constraint lengths K = 5, 6, 7, 8, and 9, rates R = 1/2, 1/3, and 1/4,
and flexible polynomials, while generating hard decisions or soft decisions. The TCP operating at CPU Clock
divided-by-2 CAN decode up to forty-three 384-Kbps or seven 2-Mbps turbo encoded channels (assuming 6
iterations). The TCP 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 VCP/TCP and the CPU are carried out through the EDMA
controller. By Texas Instruments
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