[Solved] CENG232 Homework4-Basic memories as Verilog modules

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Part 1: RGB Memory

In this part, you are expected to implement basic memories as Verilog modules. These modules will be used to apply masking operations to a given pixel of an image and save the resulting value to the memory. Illustration of the modules is provided in Figure 1.

Figure 1: Illustration of the modules.

1.1 RgbMask Module

This is the upper module, in which inputs and outputs of other modules are defined. The inputs of this module; RGBin, Mode, Address and Op are distributed to RgbRAM and MaskROM modules.

The pixel value, which will be given as input RGBin, consists of 3 color channels: Red, Green and Blue. Each of these channels contains 8 bits and has a range from 0 to 255. Illustration of RGBin is provided below:

RGBin (24 bits)
Red Green Blue
8 bits 8 bits 8 bits

Mode can be either Write(1) or Read(0).

4-bit Address input is used to point memory locations by both of the modules.

The details of masking operations (Op) are provided in Table 2.

RgbMaskModule has already been implemented by us; hence, you should not implement this module. MaskROM and RgbRAM modules will be implemented by yourselves.

1.2 MaskROM Module

This module basically contains 16 registers. Each register has a size of 8 bits, and stores a unique Mask value. The module returns the value of the register pointed by the given RomAddress as output RomDataOut. It works as a combinational circuit. That means it is not triggered by a clock pulse; it is triggered by RomAddress change. The values of ROM should be set as given in Table 1.

Address Value (8 bits)
0 00000000
1 00001111
2 00011110
3 00110000
4 01010000
5 01100110
6 01101010
7 01111110
8 10000001
9 10100000
10 10100110
11 10111101
12 11000000
13 11010000
14 11010011
15 11100110

Table 1: ROM Structure

Use the following Verilog definition for the module:

module MaskROM (

input [ 3 : 0 ] RomAddress, output reg [ 7 :0 ] RomDataOut

) ;

1.3 RgbRAM Module

RgbRAM module is used to store/retrieve 24-bit RGB pixel values. In write mode(Mode=1), a specific mask operation(Op) is applied and the result is saved to the RamAddress location of the memory. In read mode(Mode=0) the 24-bit pixel value is retrieved from the RamAddress location of the memory.

Use the following Verilog definition for the module:

module RgbRAM (

input Mode, input [ 3 : 0 ] RamAddress, input [23:0] RamDataIn, input [ 7 : 0 ] Mask, input [ 2 : 0 ] Op, input CLK, output reg [23:0] RamDataOut

) ;

1.3.1 Read Mode:

In Read Mode, when RamAddress value is given as i, the value stored in the ith index of the RgbRAM will be returned as output RamDataOut. No masking or write operation is conducted on the memory during this mode. This operation will be combinational. That means it is not triggered by a clock pulse; but triggered by the following events:

When Mode is changed from Write to Read, or

When the value of RamAddress is changed during Read mode.

Note: Initially, the values of all RAM registers will be 0 .

1.3.2 Write Mode:

In Write Mode, you will perform the requested masking operation (Op) on each of R, G and B channels of RamDataIn in the same clock cycle. After applying the operation, you will save the 24-bit result to RamAddress location of the memory. This procedure will be sequential, and it is triggered by the positive edge of the clock pulse.

Op values and their corresponding masking operations are provided in Table 2.

Op Operation
000 Bitwise AND
001 Bitwise OR
010 Bitwise XOR
011 Add
100 Subtract
101 Increment
110 Decrement
111 Rotate Left

Table 2: Mask Operations

Detailed explanations and examples for the operations are provided below. Note that Mask is the value that comes from MaskROM. Also note that you should save the result of the operation to the RamAddress location of the memory.

Bitwise AND: You should perform AND operation between the Mask and each channel of RamDataIn.

RamDataIn (24 bit) Mask (8 bit) Result (24 bit)
10000001 11000011 01000010 10100110 10000000 10000010 00000010

Bitwise OR: You should perform OR operation between the Mask and each channel of RamDataIn.

RamDataIn (24 bit) Mask (8 bit) Result (24 bit)
10000001 11000011 01000010 10100110 10100111 11100111 11100110

Bitwise XOR: You should perform XOR operation between the Mask and each channel of RamDataIn.

RamDataIn (24 bit) Mask (8 bit) Result (24 bit)
10000001 11000011 01000010 10100110 00100111 01100101 11100100

Add: You should add the Mask value to each channel of RamDataIn. The channel value cannot be greater than 255. Set result to 255 if the output of the addition is greater than 255.

RamDataIn (24 bit) Mask (8 bit) Result (24 bit)
10000001 11000011 01000010 10100110 11111111 11111111 11101000

Subtract: The Mask value should be subtracted from each channel of RamDataIn. The channel value cannot be less than 0. Set the result to 0 if the output of the subtraction is less than 0.

RamDataIn (24 bit) Mask (8 bit) Result (24 bit)
10000001 11000011 01000010 10100110 00000000 00011101 00000000

Increment: Increment each channel of RamDataIn by 1. The channel value cannot be greater than 255. As in Add operation, you should set the result to 255 if the output of the addition is greater than 255.

RamDataIn (24 bit) Mask (8 bit) Result (24 bit)
10000001 11000011 01000010 not applied 10000010 11000100 01000011

Decrement: Decrement each channel of RamDataIn by 1. The channel value cannot be less than 0. As in Subtract operation, the result should be 0 if the output of the subtraction is less than 0.

RamDataIn (24 bit) Mask (8 bit) Result (24 bit)
10000001 11000011 01000010 not applied 10000000 11000010 01000001

Rotate Left: Shift all the bits of each channel to the left by one. In addition, set the rightmost bit to the previous value of the leftmost bit.

RamDataIn (24 bit) Mask (8 bit) Result (24 bit)
10000001 11000011 01000010 not applied 00000011 10000111 10000100

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[Solved] CENG232 Homework4-Basic memories as Verilog modules
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