This is an implementation of the Tesselated Intelligence System architecture in Verilog. So far, only Node Type T21 is implemented.

The TIS-100 is from the game, TIS-100.

Node Type T21 provides basic processing functionality. Diverging slightly from the game, it uses 11-bit signed data, such that the range of values is -1024 to 1023. Unlike the game, this T21 does not saturate, but undergoes rollover for both data instructions and for the instruction pointer.

All 12 instructions are implemented using a 16-bit instruction word. The format is as follows:

• Let A be a 3-bit value corresponding to a register.
• Let B be a 12-bit value. If the MSB is 1, bits [10:8] specify a register. Otherwise bits [10:0] specify a constant.
• Let C be a 4-bit value, pointing to an location in program memory.

[15:0] Instruction word - Description
0aaabbbbbbbbbbbb 				- MOV b, a. Moves B to A. All zeros = MOV 0, NIL = NOP
1000bbbbbbbbbbbb 				- ADD b. Adds b to ACC.
1001bbbbbbbbbbbb 				- SUB b. Subtracts b from ACC.
1010bbbbbbbbbbbb 				- JRO b. Bits [3:0] of b used. Rollover can occur.
1011bbbbbbbbbbbb 				- RESERVED
110000ccccxxxxxx 				- JMP c. Jumps to c.
110001ccccxxxxxx 				- JEZ c. Jumps to c if ACC == 0.
110010ccccxxxxxx 				- JNZ c. Jumps to c if ACC != 0.
110011ccccxxxxxx 				- JGZ c. Jumps to c if ACC > 0.
110100ccccxxxxxx 				- JLZ c. Jumps to c if ACC < 0.
110NNNccccxxxxxx 				- RESERVED for all N > 4
1110000xxxxxxxxx 				- NEG. Negates ACC.
1110001xxxxxxxxx 				- SAV. Saves ACC to BAK register.
1110010xxxxxxxxx 				- SWP. Swaps ACC and BAK.
1110NNNxxxxxxxxx 				- RESERVED for all N > 2.

The Node itself does not specify which neighbor is UP, DOWN, LEFT, or RIGHT. Priority is given to 0, then 1, then 2, and then 3. To match the game, 0/1/2/3 should correspond to LEFT/RIGHT/UP/DOWN.

Not present in the game, but offered here as a lighter-weight alternative to T21. It does not implement the ANY or LAST registers in order to save on size, but is otherwise identical to T21.

Planned to function using a compact RAM with a stack pointer.

Planned to use VGA output and a small video RAM with 3-bit data. Will have more colors and the option to skip updating a pixel, but otherwise functions the same as the in-game module.

All nodes expect the following inputs:

• [10:0] in0 - in3: Inputs from neighboring nodes
• [3:0] ready - Bits are high when neighbor is attempting to send data to this node
• [3:0] done - Bits strobe when corresponding neighbor received data from this node.

All nodes provide the following outputs:

• [3:0] recv - Bits strobe when data has been received from corresponding neighbor.
• [3:0] send - Bits are high when attempting to send data to corresponding neighbor.
• [10:0] outData - Data the node is attempting to send out.

I/O Modules, like the Visualization Module, have the following connections:

• Input [10:0] in - Input from attached node
• Input ready - High when node is sending data to module
• Input done - Strobed when node received data from this module
• Output recv - Strobed when module received data from this node
• Output send - High when module is sending data to node
• Output [10:0] out - Data being sent to attached node