The Nano-1 Processor

My implementation of the Nano-1 processor can be found in nano.circ.

The evaluation template is eval.txt

To use this implementation:

1. Enter a 9 bit instruction in the instruction register (IR). This is tricky due to confusion I caused in my specification. A typical instruction has the binary format:

rst.uvw.xyz

Where

rst = opcode
uvw = arg0 = principle source register and destination register (loads bus0 and bus2)
xyz = arg1 = secondary source register (loads bus1)

Each of these numbers is between 0 and 7.

However, in hex this number will have the format:

r.stuv.wxyz

If a 16 bit IR is used, then the format will be:

0000.000r.stuv.wxyz

2. Click twice on the clock that loads the status register.

3. Click twice on the clock that loads the data registers.

Examples

R3 = R3 + R2

before
R2 = 0x0029
R3 = 0x0018
IR₉ = 000.011.010 = 0.0001.1010 = 0x01a = 072
IR₁₆ = 0000.0011.1010 = 0x003a

after
R2 = 0x0029
R3 = 0x0041
status = 0x0000

R4 = R4 & R6

before
R4 = 0x0e38 = 0000.1110.0011.10000
R6 = 0xaaaa = 1010.1010.1010.1010
IR₉ = 110.100.110 = 1.1010.0110 = 0x1a6
IR₁₆ = 0000.0001.1010.0110 = 0x01a6

after
R4 = 0x0a28 = 0000.1010.0010.1000
R6 = 0xaaaa
status = 0x0000

R5 = ~R5

before
R5 = 0x0f0f = 0000.1111.0000.1111
IR₉ = 111.101.000 = 1.1110.1000 = 0x1e8 // any 3 last digits will work since they are ignored
IR₁₆ = 0x0178

after
R5 = 0xf0f0 = 1111.0000.1111.0000
status = 0x0000

R5 = R5 << 1

before
R5 = 0xffff = 1111.1111.1111.1111
IR₉ = 100.101.000 = 1.0010.1000 = 0x128
IR₁₆ = 0x0128

after
R5 = 0xfffe = 1111.1111.1111.1110
status = 0x0001

R1 = R1 / R7

before
R1 = 0x002d = 45
R7 = 0x0006 = 6
IR₉ = 011.001.111 = 0.1100.1111 = 0x0cf
IR₁₆ = 0x00cf

after
R1 = 0x0007 = 7
status = 0x0003 = 3