Shift operators in VHDL - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to perform a left shift by 2 bits on the signal data_in.

VHDL

data_out <= data_in [1] 2;

Drag options to blanks, or click blank then click option'

Asrl

Bsll

Crol

Dror

Attempts:

3 left

💡 Hint

Common Mistakes

Using srl which shifts bits to the right.

Using rotate operators rol or ror instead of shift.

The sll operator shifts bits to the left, filling with zeros on the right.

2fill in blank

medium

Complete the code to perform a right shift by 3 bits on the signal data_in.

VHDL

data_out <= data_in [1] 3;

Drag options to blanks, or click blank then click option'

Asll

Bror

Crol

Dsrl

Attempts:

3 left

💡 Hint

Common Mistakes

Using sll which shifts bits left.

Using rotate operators rol or ror instead of shift.

The srl operator shifts bits to the right, filling with zeros on the left.

3fill in blank

hard

Fix the error in the code to rotate the signal data_in left by 1 bit.

VHDL

data_out <= data_in [1] 1;

Drag options to blanks, or click blank then click option'

Arol

Bsrl

Cror

Dsll

Attempts:

3 left

💡 Hint

Common Mistakes

Using sll which shifts bits but does not wrap.

Using ror which rotates right instead of left.

The rol operator rotates bits to the left, wrapping the leftmost bit to the right end.

4fill in blank

hard

Fill both blanks to shift data_in right logically by 4 bits and assign to data_out.

VHDL

data_out <= data_in [1] [2];

Drag options to blanks, or click blank then click option'

Asrl

Bsll

C4

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using sll which shifts left.

Using wrong number of bits like 1.

Use srl to shift right logically and 4 as the number of bits.

5fill in blank

hard

Fill both blanks to rotate data_in right by 2 bits and assign to data_out.

VHDL

data_out <= data_in [1] [2];

Drag options to blanks, or click blank then click option'

Asrl

Bror

C2

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using srl which shifts but does not rotate.

Using wrong number of bits like 3.

Use ror to rotate right and 2 as the number of bits.