This document discusses different types of digital signal processors (DSPs). It describes general purpose DSPs that have optimized architectures and instruction sets for digital signal processing operations. It also describes special purpose DSPs that are designed for specific algorithms or applications. Several examples of DSP chips are provided, including the TMS320C3x, TMS320C4x, TMS320C5x, TMS320C55x, and TMS320C62xx. The document also provides an overview of different processor architectures used in DSPs, such as the von Neumann, Harvard, and very long instruction word architectures.

1. DIGITAL SIGNAL
PROCESSORS
-PREM RANJAN
14ESP003

2. OVERVIEW
1. Genaral purpose digital signal processors
2. Special purpose digital signal processors

3. OVERVIEW
1. Genaral purpose digital signal processors
1. High speed microprocessor
2. Architechture & Instruction sets optimized for DSP operations
1. Fixed point processors ( TMS320C5x, TMS320C54x, DSP563x)
2. Floating point processors (TMS320C4x, TMS320C67xx)
3. Analog devices (ADSP21xx)

4. OVERVIEW
1. Genaral purpose digital signal processors
2. Special purpose digital signal processors
1. H/W designed for specific DSP algorithms such as FFT.
2. H/W designed for specific DSP applications such as PCM & filtering.
1. Mitel’s multi channel telephony voice echo canceller (MT93001)
2. FFT processor (PDSP 16515A, TM-44, TM-66)
3. Programmable FIR filter (UDSP 16256, Model3092)

5. NEED OF DIGITAL SIGNAL PROCESSOR

7. THE TMS320C3X
• First Texas Instruments 32-bit floating point digital
signal processors.
• It is :
• Easy-to-use architecture
• High performance
• Applications:
• It has Independent multiplier and ALU
to offer upto 60 million floating-point
operations per second (MFLOPS)
• It has upto 30 MIPS.
• Total memory space is 16 million 32-
bit words.
• Automotive applications
• Digital audio
• Industrial automation & control
• Data communication
• Office equipments like copiers, laser printers, etc.

8. THE TMS320C4X
• 32-bit floating point digital signal processors optimized for
parallel processing.
• It is :
• DMS controller with upto 6 com ports
• High performance
• On chip analysis module that supports h/w breakpoints for parallel processing
dev & debugging
• Applications:
• 3-D graphics
• Image processing
• Networking
• Telecommunication base station

9. THE TMS320C5X
• Accepts source code from the ‘C1x, ‘C2x and ‘C2xx generations.
• It is :
• Faster cycle times
• On chip memories
• A Parallel Logic Unit (PLU)
• Zero overhead context switching
• Block repeats differentiate the ‘C5x
• It has also an ANSI C compiler designed for the ‘C5x, which
translates the widely used ANSI C language directly into highly
optimized assembly language for the ‘C5x.

10. THE TMS320C55X
• 16-bit fixed-point packaged DSP processor.
• It can execute upto 2 instructions in parallel (instruction width 8
– 48 bits)
• Interfaces directly to SDRAM
• Used where large memory buffers are needed
• Application:
• Digital cameras
• CD-ROM
• Audio players

11. THE TMS320C62XX
• Fixed-point DSP processor.
• It is based on VLIW architecture
• For example:
• TMS320C62xx works at 200MHz with 1.8V core supply
• It executes upto 400 millions MACs per second.

12. VON NEUMANN ARCHITECTURE
• Proposed by John Von
Neumann
• Also known as the Von
Neumann
model and Princeton
architecture
• Program instructions stored
in ROM
• Both read/write of data and
reading of instructions can’t
be performed simultaneously

13. VON NEUMANN ARCHITECTURE
Single System
Bus

14. HARVARD ARCHITECTURE

15. HARVARD ARCHITECTURE

16. MODIFIED/SUPER HARVARD ARCHITECTURE
(SHARC®)

17. VERY LONG INSTRUCTION WORD
ARCHITECTURE

18. VERY LONG INSTRUCTION WORD
ARCHITECTURE
• Advantages
• Increased performance
• Better compiler targets
• Potentially easier to program
• Potentially scalable
• Can add more execution units,
allow more instructions to be
packed into VLIW instruction.
• Disadvantages
• New kind of
programmer/compiler
complexity
• Program must keep track of
instruction scheduling
• Increased memory use
• High power consumption
• Misleading MIPS ratings