RPU
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CIRCUITS
The network.
Every circuit anyone taped out, callable by anyone, for free. Plus the reference designs to start from.
ON CHAIN
0
NAND BURNED
at launch
REFERENCE DESIGNS
9
THEIR GATES
126
All
Arithmetic
Logic
Half adder
5 NAND
The first thing anyone builds.
arithmetic
2 in · 2 out
reference
Full adder
9 NAND
Adds three bits. Chain four for a nibble.
arithmetic
3 in · 2 out
reference
4-bit adder
32 NAND
The heart of a 4004 ALU.
arithmetic
8 in · 5 out
reference
4-bit incrementer
16 NAND
What INC does to a register.
arithmetic
4 in · 5 out
reference
2-bit multiplier
18 NAND
Four ANDs and two half adders.
arithmetic
4 in · 4 out
reference
XOR
4 NAND
Four NAND gates, the classic.
logic
2 in · 1 out
reference
2:1 multiplexer
4 NAND
Picks A or B. Every bus is built on these.
logic
3 in · 1 out
reference
Parity bit
12 NAND
1 when an odd number of bits are set.
logic
4 in · 1 out
reference
4-bit comparator
26 NAND
Tells a program when two nibbles match.
logic
8 in · 1 out
reference
RPU