<< Chapter < Page Chapter >> Page >

Every instruction in the C6x can execute conditionally. There are five registers available for conditions (on the C67x processors): A1, A2, B0, B1, and B2. If blank, the instruction always executes. Conditions can take a form such as [A1] where the instruction will execute if A1 is not zero. This can be handy for making loops were the counter is put in a register like A1 and is counted down to zero. The condition is put on the branch instruction that branches back to the beginning of the loop.

Register files

Where are the numbers stored in the CPU? In the C6000, the numbers used in operations are stored in register. Because the registers are directly accessible though the data path of the CPU, accessing the registers is much faster than accessing data in the external memory.

The C6000 CPU has two register files (A and B). Each of these files consists of sixteen 32-bit registers (A0-A15 for file A and B0-B15 for file B). The general-purpose registers can be used for data, data address pointers, or condition registers. The following figure shows a block diagram of the C67x processors. This basic structure is similar to other processors in the C6000 family.

TMS320C67x DSP Block Diagram taken from SPRU733: TMS320C67x/C67x+ DSP CPU and Instruction Set Reference Guide

The general-purpose register files support data ranging in size from 16-bit data through 40-bit fixed-point. Values larger than 32 bits, such as 40-bit long quantities, are stored in register pairs. In a register pair, the 32 LSB's of data are placed in an even-numbered register and the remaining 8 MSB's in the next upper register (which is always an odd-numbered register). In assembly language syntax, a colon between two register names denotes the register pairs, and the odd-numbered register is specified first. For example, A1:A0 represents the register pair consisting of A0 and A1.

Let's for now focus on file A only. The registers in the register file A are named A0 to A15. Each register can store a 32-bit binary number. Then numbers such as a , x , prod and y above are stored in these registers. For example, register A0 stores a . For now, let's assume we interpret all 32-bit numbers stored in registers as unsigned integer. Therefore the range of values we can represent is 0 to 2 32 size 12{2 rSup { size 8{"32"} } } {} −1. Let's assume the numbers a , x , prod and y are in the registers A0, A1, A3, A4, respectively. Then the above assembly instructions can be written specifically:

MPY .M1 A0,A1,A3 ADD .L1 A4,A3,A4

The TI C6000 CPU has a load/store architecture. This means that all the numbers must be stored in the registers before being used as operands of the operations for instructions such as MPY and ADD . The numbers can be read from a memory location to a register (using, for example, LDW , LDB instructions) or a register can be loaded with a constant value. The content of a register can be stored to a memory location (using, for example, STW , STB instructions).

In addition to the general-purpose register files, the CPU has a separate register file for the control registers. The control registers are used to control various CPU functions such as addressing mode, interrupts, etc.

Questions & Answers

what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!

Source:  OpenStax, Dsp lab with ti c6x dsp and c6713 dsk. OpenStax CNX. Feb 18, 2013 Download for free at http://cnx.org/content/col11264/1.6
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Dsp lab with ti c6x dsp and c6713 dsk' conversation and receive update notifications?