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SM320C6414-EP Datasheet(PDF) 8 Page - Texas Instruments

Part # SM320C6414-EP
Description  FIXED-POINT DIGITAL SIGNAL PROCESSORS
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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SM320C6414-EP Datasheet(HTML) 8 Page - Texas Instruments

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SM320C6414-EP, SM320C6415-EP, SM320C6416-EP
FIXED-POINT DIGITAL SIGNAL PROCESSORS
SGUS043D – MAY 2003 – REVISED SEPTEMBER 2008
www.ti.com
The two .M functional units perform all multiplication operations. Each of the C64x .M units can perform
two 16-bit
× 16-bit multiplies or four 8-bit × 8-bit multiplies per clock cycle. The .M unit can also perform
16-bit
× 32-bit multiply operations, dual 16-bit × 16-bit multiplies with add/subtract operations, and quad
8-bit
× 8-bit multiplies with add operations. In addition to standard multiplies, the C64x .M units include
bit-count, rotate, Galois field multiplies, and bidirectional variable shift hardware.
The two .S and .L functional units perform a general set of arithmetic, logical, and branch functions, with
results available every clock cycle. The arithmetic and logical functions on the C64x CPU include single
32-bit, dual 16-bit, and quad 8-bit operations.
The processing flow begins when a 256-bit-wide instruction fetch packet is fetched from a program
memory. The 32-bit instructions destined for the individual functional units are linked together by "1" bits in
the least significant bit (LSB) position of the instructions. The instructions that are chained together for
simultaneous execution (up to eight in total) compose an execute packet. A "0" in the LSB of an
instruction breaks the chain, effectively placing the instructions that follow it in the next execute packet. A
C64x DSP device enhancement now allows execute packets to cross fetch-packet boundaries. In the
TMS320C62x/TMS320C67x™ DSP devices, if an execute packet crosses the fetch-packet boundary (256
bits wide), the assembler places it in the next fetch packet, while the remainder of the current fetch packet
is padded with no-operation (NOP) instructions. In the C64x DSP device, the execute boundary
restrictions have been removed, thereby, eliminating all of the NOPs added to pad the fetch packet and,
thus, decreasing the overall code size. The number of execute packets within a fetch packet can vary from
one to eight. Execute packets are dispatched to their respective functional units at the rate of one per
clock cycle, and the next 256-bit fetch packet is not fetched until all the execute packets from the current
fetch packet have been dispatched. After decoding, the instructions simultaneously drive all active
functional units for a maximum execution rate of eight instructions every clock cycle. While most results
are stored in 32-bit registers, they can be subsequently moved to memory as bytes, halfwords, words, or
doublewords. All load and store instructions are byte, halfword, word, or doubleword addressable.
For more details on the C64x CPU functional units enhancements, see the following documents:
• TMS320C6000 CPU and Instruction Set Reference Guide (literature number SPRU189)
• TMS320C64x™ Technical Overview (literature number SPRU395)
• How to Begin Development Today With the TMS320C6414, TMS320C6415, and TMS320C6416 DSPs
application report (literature number SPRA718)
Introduction
8
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