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參數(shù)資料
| 型號： | TMX320DM6446ZWT |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Digital Media System on-Chip |
| 中文描述： | 數(shù)字媒體系統(tǒng)芯片 |
| 文件頁數(shù)： | 13/214頁 |
| 文件大?。?/td> | 1699K |
| 代理商： | TMX320DM6446ZWT |
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2.4
DSP Subsystem
2.4.1
C64X+ DSP CPU Description
TMS320DM6446
Digital Media System on-Chip
SPRS283–DECEMBER 2005
The DSP Subsystem includes the following features:
C64X+ DSP CPU
32KB L1 Program (L1P)/Cache (up to 32KB)
80KB L1 Data (L1D)/Cache (up to 32KB)
64KB Unified Mapped RAM/Cache (L2)
Little endian
The C64x+ Central Processing Unit (CPU) consists of eight functional units, two register files, and two
data paths as shown in
Figure 2-1
. The two general-purpose register files (A and B) each contain
32 32-bit registers for a total of 64 registers. The general-purpose registers can be used for data or can be
data address pointers. The data types supported include packed 8-bit data, packed 16-bit data, 32-bit
data, 40-bit data, and 64-bit data. Values larger than 32 bits, such as 40-bit-long or 64-bit-long values are
stored in register pairs, with the 32 LSBs of data placed in an even register and the remaining 8 or
32 MSBs in the next upper register (which is always an odd-numbered register).
The eight functional units (.M1, .L1, .D1, .S1, .M2, .L2, .D2, and .S2) are each capable of executing one
instruction every clock cycle. The .M functional units perform all multiply operations. The .S and .L units
perform a general set of arithmetic, logical, and branch functions. The .D units primarily load data from
memory to the register file and store results from the register file into memory.
The C64x+ CPU extends the performance of the C64x core through enhancements and new features.
Each C64x+ .M unit can perform one of the following each clock cycle: one 32 x 32 bit multiply, one 16 x
32 bit multiply, two 16 x 16 bit multiplies, two 16 x 32 bit multiplies, two 16 x 16 bit multiplies with
add/subtract capabilities, four 8 x 8 bit multiplies, four 8 x 8 bit multiplies with add operations, and four
16 x 16 multiplies with add/subtract capabilites (including a complex multiply). There is also support for
Galois field mutiplication for 8-bit and 32-bit data. Many communications algorithms such as FFTs and
modems require complex multiplication. The complex multiply (CMPY) instruction takes for 16-bit inputs
and produces a 32-bit real and a 32-bit imaginary output. There are also complex multiplies with rounding
capability that produces one 32-bit packed output that contain 16-bit real and 16-bit imaginary values. The
32 x 32 bit multiply instructions provide the extended precision necessary for audio and other
high-precision algorithms on a variety of signed and unsigned 32-bit data types.
The .L or (Arithmetic Logic Unit) now incorporates the ability to do parallel add/subtract operations on a
pair of common inputs. Versions of this instruction exist to work on 32-bit data or on pairs of 16-bit data
performing dual 16-bit add and subtracts in parallel. There are also saturated forms of these instructions.
The C64x+ core enhances the .S unit in several ways. In the C64x core, dual 16-bit MIN2 and MAX2
comparisons were only available on the .L units. On the C64x+ core they are also available on the .S unit
which increases the performance of algorithms that do searching and sorting. Finally, to increase data
packing and unpacking throughput, the .S unit allows sustained high performance for the quad 8-bit/16-bit
and dual 16-bit instructions. Unpack instructions prepare 8-bit data for parallel 16-bit operations. Pack
instructions return parallel results to output precision including saturation support.
Other new features include:
SPLOOP
- A small instruction buffer in the CPU that aids in creation of software pipelining loops where
multiple iterations of a loop are executed in parallel. The SPLOOP buffer reduces the code size
associated with software pipelining. Futhermore, loops in the SPLOOP buffer are fully interruptible.
Compact Instructions
- The native instruction size for the C6000 devices is 32 bits. Many common
instructions such as MPY, AND, OR, ADD, and SUB can be expressed as 16 bits if the C64x+
compiler can restrict the code to use certain registers in the register file. This compression is
performed by the code generation tools.
Device Overview
13
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TMX320DM6467TZUT1 | 制造商:Texas Instruments 功能描述: |
| TMX320DM6467ZUT | 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC Dig Media System-on- Chip RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT |
| TMX320DM647ZUT720 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Digital Media Processor |
| TMX320DM647ZUT900 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Digital Media Processor |
| TMX320DM648ACUT7 | 制造商:Texas Instruments 功能描述:- Trays |
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