Tiny CPU Instruction Set
After four months of inactivity, here’s some documentation for the Tiny CPU instruction set. opcode x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF 0x SUB abs SUB imm SUB abs,X ADD…
Year 2010
Pin Constraints
I think I’ve found answers for all the big questions about Tiny CPU’s design, and I’m ready to start creating the final schematic and board layout, save for one issue: pin constraints. I need to constrain which signals are assigned…
Tiny Device
Tiny CPU just barely squeezes into a 128-macrocell CPLD, and so I’ve designed a companion chip called Tiny Device to handle other interface functions. It utilizes a second CPLD, and was originally envisioned as a simple address decoder, but its…
Bank Switching
The Tiny CPU design has a 10-bit address bus — that’s all I could fit in the constrained space of the CPLD. 10 bits means 1K of addressable memory, which is practically nothing. I had planned to improve on this…
2D Graphics Thingy?
Maybe 3D Graphics Thingy isn’t dead after all. One of my goals for the creation of Tiny CPU was to get more comfortable with programmable logic design, and custom circuit board development, and I’ve certainly done that. Once Tiny CPU…
Power Research
I’d like Tiny CPU to be flexible with its power requirements. The Tiny Test Board that I made uses an external, 5V regulated power supply, and so doesn’t have any on-board voltage regulation. That works fine, but I’d like the…
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