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labs:sp20_codebreaker_serial [2020/06/08 09:14] nelson created |
labs:sp20_codebreaker_serial [2020/06/11 10:18] (current) nelson [Exercise #1 - Draw a message on the screen] |
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| * The [[resources:rc4|decrypt_rc4 module]]. This module performs the decryption. You will provide a 128-bit message, a 24-bit key, and a start signal. It will takes some time to perform the decryption, and then it will raise its ''done'' output, and provide the decrypted message. | * The [[resources:rc4|decrypt_rc4 module]]. This module performs the decryption. You will provide a 128-bit message, a 24-bit key, and a start signal. It will takes some time to perform the decryption, and then it will raise its ''done'' output, and provide the decrypted message. | ||
| * The [[resources:char_drawer_serial|CharDrawer_serial]] module. You provide this module with a 128-bit ASCII message and a ''start'' signal. If you look inside it you will see that it expects to be able to instance a UART transmitter. Use your UART Transmitter design from a previous week's lab for this. | * The [[resources:char_drawer_serial|CharDrawer_serial]] module. You provide this module with a 128-bit ASCII message and a ''start'' signal. If you look inside it you will see that it expects to be able to instance a UART transmitter. Use your UART Transmitter design from a previous week's lab for this. | ||
| + | * A {{ :resources:clk_generator.v | clk_generator module}} module that generates two clocks for this design. | ||
| - | You should also use your 7 segment controller from a previous lab for this. | + | You will also use your 7 segment controller and Uart Transmitter from previous labs for this project. |
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| Look over the code and draw a block diagram of it to make sure you understand how it works. The module contains: | Look over the code and draw a block diagram of it to make sure you understand how it works. The module contains: | ||
| - | * A ''clk_generator'' instance, that generates two clocks (only one of which is being used in this design). **NOTE: this is a complex circuit which is able to synthesize multiple other clocks from a single input clock. As such, it REQUIRES at least 400ns simulation time before it will output valid clock signals to the rest of your circuit. See note below.** | + | * A ''clk_generator'' instance, that generates two clocks (only one of which is being used in this design). **NOTE: this is a complex circuit which is able to synthesize multiple other clocks from a single input clock. As such, it REQUIRES at least 400ns simulation time before it will output valid clock signals to the rest of your circuit. See note below.** |
| + | * Before you proceed, go back and re-read the previous paragraph. What it is saying is that in your .tcl file, once you start the clock going you should simulate 400ns without doing anything else just so the clock generator can initialize itself. Only then should you start resetting or doing anything else with your circuit. | ||
| * A ''CharDrawer_serial'' instance. It is used to send bytes out the "tx_out" port to be displayed by the "putty" program. It relies on your having added your own Uart Transmitter design to the project. Find down near the bottom where it instances a ''tx'' instance - that should be your design. Make sure the module name and port names match your design. | * A ''CharDrawer_serial'' instance. It is used to send bytes out the "tx_out" port to be displayed by the "putty" program. It relies on your having added your own Uart Transmitter design to the project. Find down near the bottom where it instances a ''tx'' instance - that should be your design. Make sure the module name and port names match your design. | ||
| * ''SevenSegmentControl'' and ''stopwatch'' instances, that are configured like the Stopwatch lab. | * ''SevenSegmentControl'' and ''stopwatch'' instances, that are configured like the Stopwatch lab. | ||
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| * Waits for the start button | * Waits for the start button | ||
| * Decrypts the cyphertext and obtains the plaintext. | * Decrypts the cyphertext and obtains the plaintext. | ||
| - | * Displays the plaintext message on the VGA display. | + | * Displays the plaintext message over the serial console. |
| * Stays in a terminating state until reset. | * Stays in a terminating state until reset. | ||
