FIFO buffer design concept in Verilog - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a FIFO buffer with a depth of 8.

Verilog

reg [7:0] fifo_mem [0:[1]-1];

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A8

B32

C4

D16

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong depth size like 16 or 4.

Forgetting that the index starts at 0.

The FIFO depth is 8, so the memory array should have 8 entries indexed from 0 to 7.

2fill in blank

medium

Complete the code to increment the write pointer in the FIFO.

Verilog

write_ptr <= (write_ptr + 1) % [1];

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A16

B8

C4

D32

Attempts:

3 left

💡 Hint

Common Mistakes

Using a modulo value different from the FIFO depth.

Not wrapping the pointer causing overflow.

The write pointer wraps around after reaching the FIFO depth, which is 8.

3fill in blank

hard

Fix the error in the FIFO full condition check.

Verilog

fifo_full = ([1] == read_ptr);

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A(write_ptr - 1) % 8

B(read_ptr - 1) % 8

Cread_ptr

D(write_ptr + 1) % 8

Attempts:

3 left

💡 Hint

Common Mistakes

Comparing write pointer directly to read pointer without increment.

Using incorrect modulo arithmetic.

The FIFO is full when the next write pointer position equals the read pointer.

4fill in blank

hard

Fill both blanks to complete the FIFO empty condition check.

Verilog

fifo_empty = ([1] == [2]);

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Awrite_ptr

Bread_ptr

Cwrite_ptr + 1

Dread_ptr + 1

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing empty with full condition.

Using pointer plus one instead of direct comparison.

The FIFO is empty when the write pointer equals the read pointer.

5fill in blank

hard

Fill all three blanks to complete the FIFO write operation.

Verilog

if (write_enable && !fifo_full) begin
  fifo_mem[[1]] <= [2];
  [3] <= ([3] + 1) % 8;
end

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

Awrite_ptr

Bdata_in

Dread_ptr

Attempts:

3 left

💡 Hint

Common Mistakes

Using read pointer instead of write pointer for writing.

Not incrementing the pointer correctly.

Write data to memory at write pointer, then increment write pointer modulo FIFO depth.