Question

Inputs: A[128][8], go (bit), Outputs: sdiff (xx bits), done (bit) while(1){ while( !go ); done = 0; m = 127; n = 0; sdiff = 0; while(n < 64){ temp1 = A[n]; temp2 = A[m]; if (tempi < temp2) sdiff = sdiff + (temp2 – templ); else sdiff = sdiff + (temp1 - temp2); n = n + 1; m = m - 1; done = 1;

Can someone help convert this C code to HLSM (list local storage w bits and draw HLSM)? Any help would be greatly appreciated.

Answer 1

Approach

1.Identify the inputs and outputs.

2.Identify what you may need to store locally(Using registers)

3.Draw HLSM

HLSM stands for high level state machine.

HLSM can be used to capture more complex behaviour such as :

• capture more complex logic involving multi-bit variables.
• Local storage.
• Arithmentic Operations -Add,Multiply etc..

● HSLMs will follow these conventions

• – All inputs, outputs, and local storage are defined at the top of the HLSM diagram
• – Registered values change on rising clock edges
• – Transition bits are implicitly ANDed with rising clock edge
• – Any output bit not explicitly assigned is 0
• – Any registered value not explicitly assigned holds its value
• – Bits are designated by surrounding them with single quotes, integers have no quotes
• '1' is a bit value, 1 is an integer
• “:=” assigns a value to a variable, “==” compares two values.
• “//” defines a comment, just as in C or C++

                     HLSM Warnings.

● Clocked storage items are not updated in the same clock cycle that their control signals are set. Must wait for rising clock edge

● Note: The register control bits set up in a state prepare the value on the register inputs to be captured on the next clock cycle!

          Question:

input: A[128][8], go[bit]

output: sdiff (xx bits) , done(bit)

sdiff uses the diff command to compare them, and writes the results to standard output in a side-by-side format. The sdiff command displays each line of the two files with a series of spaces between them if the lines are identical. It displays a < (less than sign) in the field of spaces if the line only exists in the file specified by the File1 parameter, a > (greater than sign) if the line only exists in the file specified by the File2 parameter, and a | (vertical bar) for lines that are different.

HLSM diagram is as follows: