參數(shù)資料
型號： TMS320C6205GHK200
廠商： Texas Instruments
文件頁數(shù)： 72/73頁
文件大?。?/td> 0K
描述： IC DSP FIXED POINT HP 288-BGA
標準包裝： 90
系列： TMS320C62x
類型： 定點
接口： McBSP，PCI
時鐘速率： 200MHz
非易失內存： 外部
芯片上RAM： 128kB
電壓 - 輸入/輸出： 3.30V
電壓 - 核心： 1.50V
工作溫度： 0°C ~ 90°C
安裝類型： 表面貼裝
封裝/外殼： 288-LFBGA
供應商設備封裝： 288-BGA Microstar（16x16）
包裝： 托盤
其它名稱： 296-12673
TMS320C6205
FIXEDPOINT DIGITAL SIGNAL PROCESSOR
SPRS106G OCTOBER 1999 REVISED JULY 2006
8
POST OFFICE BOX 1443
HOUSTON, TEXAS 772511443
CPU (DSP core) description
The CPU fetches VelociTI
advanced very-long instruction words (VLIW) (256 bits wide) to supply up to eight
32-bit instructions to the eight functional units during every clock cycle. The VelociTI
VLIW architecture
features controls by which all eight units do not have to be supplied with instructions if they are not ready to
execute. The first bit of every 32-bit instruction determines if the next instruction belongs to the same execute
packet as the previous instruction, or whether it should be executed in the following clock as a part of the next
execute packet. Fetch packets are always 256 bits wide; however, the execute packets can vary in size. The
variable-length execute packets are a key memory-saving feature, distinguishing the C62x CPU from other
VLIW architectures.
The CPU features two sets of functional units. Each set contains four units and a register file. One set contains
functional units .L1, .S1, .M1, and .D1; the other set contains units .D2, .M2, .S2, and .L2. The two register files
each contain 16 32-bit registers for a total of 32 general-purpose registers. The two sets of functional units, along
with two register files, compose sides A and B of the CPU [see the Functional and CPU (DSP Core) Block
Diagram and Figure 1]. The four functional units on each side of the CPU can freely share the 16 registers
belonging to that side. Additionally, each side features a single data bus connected to all the registers on the
other side, by which the two sets of functional units can access data from the register files on the opposite side.
While register access by functional units on the same side of the CPU as the register file can service all the units
in a single clock cycle, register access using the register file across the CPU supports one read and one write
per cycle.
Another key feature of the C62x CPU is the load/store architecture, where all instructions operate on registers
(as opposed to data in memory). Two sets of data-addressing units (.D1 and .D2) are responsible for all data
transfers between the register files and the memory. The data address driven by the .D units allows data
addresses generated from one register file to be used to load or store data to or from the other register file. The
C62x CPU supports a variety of indirect addressing modes using either linear- or circular-addressing modes
with 5- or 15-bit offsets. All instructions are conditional, and most can access any one of the 32 registers. Some
registers, however, are singled out to support specific addressing or to hold the condition for conditional
instructions (if the condition is not automatically “true”). The two .M functional units are dedicated for multiplies.
The two .S and .L functional units perform a general set of arithmetic, logical, and branch functions with results
available every clock cycle.
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 “l(fā)inked” 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. If an execute packet crosses the
256-bit wide fetch-packet boundary, the assembler places it in the next fetch packet, while the remainder of the
current fetch packet is padded with NOP instructions. 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 or half-words as well. All load and store
instructions are byte-, half-word, or word-addressable.
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