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SM320DM642AGDKS7EP Folha de dados(PDF) 8 Page - Texas Instruments

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Nome de Peças SM320DM642AGDKS7EP
Descrição Electrónicos  Video/Imaging Fixed Point Digital Signal Processor
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SM320DM642-EP
Video/Imaging Fixed Point Digital Signal Processor
SGUS058B – JUNE 2007 – REVISED JANUARY 2008
The two .M functional units perform all multiplication operations. Each of the C64x .M units can perform
two 16
× 16-bit multiplies or four 8 × 8-bit multiplies per clock cycle. The .M unit can also perform 16 ×
32-bit multiply operations, dual 16
× 16-bit multiplies with add/subtract operations, and quad 8 × 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 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, half-words, or doublewords. All load and
store instructions are byte-, half-word-, 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)
Device Overview
8
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