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Addition, subtraction and multiplication

There are several instructions for addition, subtraction and multiplication on C62x CPU. The basic instructions are ADD , SUB , and MPY . Learn about these instructions in the TI manual. ADD and SUB have 0 delay slots (meaning the results of operation are immediately available), but the MPY has 1 delay slot (the result of multiplication is valid after additional 1 clock cycle).

(Add, subtract, and multiply): Write an assembly program to compute ( 0000 ef35h + 0000 33dch - 0000 1234h ) * 0000 0007h

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Branching and conditional operations

Often you need to control the flow of the program execution by branching to another block of code. The B instruction does the job in the C62x CPU. The address of the branch can be specified either bydisplacement or stored in a register to be used by the B instruction. Read and understand the B instruction in the manual. The B instruction has 5 delay slots, meaning that the actual branch occurs in the 5th clock cycleafter the instruction is executed.

In many cases, depending on the result of previous operations, you execute the branch instructionconditionally. For example, to implement a loop, you decrement the loop counter by 1 each time you run a set ofinstructions and whenever the loop counter is not zero, you need to branch to the beginning of the code block to iteratethe loop operations. In C62x CPU, this conditional branching is implemented using the conditional operations . Although B may be the instruction implemented using conditional operationsmost often, all instructions in C62x can be conditional.

Conditional instructions are represented in code by using square brackets, [ ] , surrounding the condition register name. For example, the following B instruction is executed only if B0 is nonzero:

1 [B0] B .L1 A0

To execute an instruction conditionally when the condition register is zero, we use ! in front of the register. Forexample, the B instruction is executed when B0 is zero.

1 [!B0] B .L1 A0

Not all registers can be used as the condition registers. In C62x CPU, the registers that can be tested in conditionaloperations are B0 , B1 , B2 , A1 , A2 .

(Simple loop): Write an assembly program computing the summation n 1 100 n by implementing a simple loop.

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Logical operations and bit manipulation

The logical operations and bit manipulations are accomplished by the AND , OR , XOR , CLR , SET , SHL , and SHR instructions. Read and understand the operations of these instructions.

Other assembly instructions

Other useful instructions include IDLE and compare instructions such as CMPEQ etc. Read and understand the operations of these instructions.

C62x instruction set summary

The set of instructions that can be performed in each functional unit is as follows (See , , and ). Please refer to TMS320C62x/C67x CPU and Instruction Set Reference Guide for detailed description of each instruction.

.s unit
Instruction Description
ADD(U) signed or unsigned integer addition without saturation
ADDK integer addition using signed 16-bit constant
ADD2 two 16-bit integer adds on upper and lower register halves
B branch using a register
CLR clear a bit field
EXT extract and sign-extend a bit field
MV move from register to register
MVC move between the control file and the register file
MVK move a 16-bit constant into a register and sign extend
MVKH move 16-bit constant into the upper bits of a register
NEG negate (pseudo-operation)
NOT bitwise NOT
OR bitwise OR
SET set a bit field
SHL arithmetic shift left
SHR arithmetic shift right
SSHL shift left with saturation
SUB(U) signed or unsigned integer subtraction without saturation
SUB2 two 16-bit integer integer subs on upper and lower register halves
XOR exclusive OR
ZERO zero a register (pseudo-operation)

Questions & Answers

explain and give four Example hyperbolic function
Lukman Reply
The denominator of a certain fraction is 9 more than the numerator. If 6 is added to both terms of the fraction, the value of the fraction becomes 2/3. Find the original fraction. 2. The sum of the least and greatest of 3 consecutive integers is 60. What are the valu
1. x + 6 2 -------------- = _ x + 9 + 6 3 x + 6 3 ----------- x -- (cross multiply) x + 15 2 3(x + 6) = 2(x + 15) 3x + 18 = 2x + 30 (-2x from both) x + 18 = 30 (-18 from both) x = 12 Test: 12 + 6 18 2 -------------- = --- = --- 12 + 9 + 6 27 3
2. (x) + (x + 2) = 60 2x + 2 = 60 2x = 58 x = 29 29, 30, & 31
on number 2 question How did you got 2x +2
combine like terms. x + x + 2 is same as 2x + 2
Mark and Don are planning to sell each of their marble collections at a garage sale. If Don has 1 more than 3 times the number of marbles Mark has, how many does each boy have to sell if the total number of marbles is 113?
mariel Reply
Mark = x,. Don = 3x + 1 x + 3x + 1 = 113 4x = 112, x = 28 Mark = 28, Don = 85, 28 + 85 = 113
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use the y -intercept and slope to sketch the graph of the equation y=6x
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Tric Reply
x-2y+3z=-3 2x-y+z=7 -x+3y-z=6
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Solve for the first variable in one of the equations, then substitute the result into the other equation. Point For: (6111,4111,−411)(6111,4111,-411) Equation Form: x=6111,y=4111,z=−411x=6111,y=4111,z=-411
x=61/11 y=41/11 z=−4/11 x=61/11 y=41/11 z=-4/11
Need help solving this problem (2/7)^-2
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the operation * is x * y =x + y/ 1+(x × y) show if the operation is commutative if x × y is not equal to -1
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A soccer field is a rectangle 130 meters wide and 110 meters long. The coach asks players to run from one corner to the other corner diagonally across. What is that distance, to the nearest tenths place.
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Jeannette has $5 and $10 bills in her wallet. The number of fives is three more than six times the number of tens. Let t represent the number of tens. Write an expression for the number of fives.
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What is the expressiin for seven less than four times the number of nickels
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Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
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. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
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Source:  OpenStax, Finite impulse response. OpenStax CNX. Feb 16, 2004 Download for free at http://cnx.org/content/col10226/1.1
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