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In this lab you will gain experience working the PicoBlaze embedded processor, an 8-bit microcontroller created by Ken Chapman of Xilinx. Read the PicoBlaze application note, especially the section detailing the instruction set.
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Create a simple assembly language program, e. Create a hardware block diagram for your system showing the processor, the external interface registers, and other major components of your system.
I suggest that you start with the PicoBlaze interface template diagram and hand-draw the rest of your system on the diagram. Manually translate the assembly language program into datxsheet language a sequence of bit values. You may datashee an assembler to check your work probably a good idea to do so Create a top-level module that contains the following: PicoBlaze processor tie the interrupt input to inactive level The program ROM must be a synchronous ROM, otherwise serious timing errors in the processor’s read and write strobes will become apparent.
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A synchronous ROM simply means that the ROM output is a register that is clocked on the rising edge of the system clock. Here is an example of a short machine language program in synchronous ROM that could be included in your top-level module: INPUT s0, 00 1: The simulation capability is a big plus for this package.
Here’s some things to know about the pBlaze IDE: The assembly language mnemonics differ slightly from those in Ken Chapman’s PicoBlaze manual.
The editor will boldface the mnemonic when it recognizes it.
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Use “equates” EQU to establish symbolic names for port numbers and constants. See the pBlaze 2dsb web page for more details on syntax: When you have cleared all the syntax errors, you will be presented with a panel that looks like this: Wave your cursor over the buttons to learn what they mean.
Click the blue button to return to the editor. In subsequent labs you will learn how to directly incorporate the assembler output into your system. For now, simply look at the hexadecimal listing in the simulator to verify your hand-coded machine instructions.
Deliverables Brief cover memo that describes your design Block diagram of your hardware Processor program, both in assembly language format human-readable form and machine instructions sequence of bit binary and hexadecimal values Hardcopy of all synthesizable Verilog files that you create Demonstration of your design to instructor obtain initials Due Date Beginning of lab one week from today.
For questions or comments regarding this web contact: Use PicoBlaze soft processor. Hand-code a machine language program from assembly language.
Ken Chapman’s PicoBlaze processor at ftp: PicoBlaze homepage at Xilinx: