Memory initialization with $readmemh in Verilog - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a memory array of 8-bit words with 256 entries.

Verilog

reg [7:0] memory [0:[1]];

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A256

B128

C512

D255

Attempts:

3 left

💡 Hint

Common Mistakes

Using 256 as the highest index instead of 255.

The memory array indices go from 0 to 255 for 256 entries.

2fill in blank

medium

Complete the code to initialize the memory from a hex file named 'data.hex' inside an initial block.

Verilog

initial begin
  $readmemh([1], memory);
end

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Adata.hex

B"data.hex"

C'data.hex'

Ddata

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting quotes or using single quotes around the filename.

The filename must be a string literal enclosed in double quotes.

3fill in blank

hard

Fix the error in the code to correctly initialize the memory using $readmemh.

Verilog

initial begin
  $readmemh("data.hex", [1]);
end

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Amem_array

Bmem

Cmemory

Dmemdata

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name that does not match the declared memory array.

The memory array variable name must match the declared memory name.

4fill in blank

hard

Fill both blanks to create a memory initialization that reads from 'init.hex' and has 128 entries.

Verilog

reg [7:0] mem [0:[1]];
initial begin
  $readmemh([2], mem);
end

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A127

B128

C"init.hex"

D'init.hex'

Attempts:

3 left

💡 Hint

Common Mistakes

Using 128 as highest index or single quotes for filename.

The memory size is 128 entries indexed 0 to 127, and the filename must be a double-quoted string.

5fill in blank

hard

Fill all three blanks to declare a 16-bit wide memory with 64 entries and initialize it from 'memdata.hex'.

Verilog

reg [[1]:0] mem_array [0:[2]];
initial begin
  $readmemh([3], mem_array);
end

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

A15

B63

C"memdata.hex"

D64

Attempts:

3 left

💡 Hint

Common Mistakes

Using 64 as highest index or missing quotes on filename.

For 16-bit width, bits go from 15 down to 0. For 64 entries, highest index is 63. Filename must be double-quoted.