612 Detronyx Arithmetic Lab Tile
612 : Detronyx Arithmetic Lab Tile
- Author: Detronyx contributors
- Description: Register-loaded add/multiply/divide arithmetic lab for TinyTapeout GF
- GitHub repository
- Open in 3D viewer
- Clock: 50000000 Hz
How it works
This project combines three public arithmetic blocks behind a tiny
register-loaded lab interface: the byte adder, the standalone combinational
8x8 multiplier, and the reciprocal-ROM divider. It has four task slots, each
with one byte in bank A and one byte in bank B. ui_in[7:0] carries data.
uio_in[2:0] selects a command: 1 writes A[bank_sel], 2 writes
B[bank_sel], 3 loads the 2-bit mode from ui_in[1:0], and 4 loads
bank_sel from ui_in[1:0]. Command 5 loads the configuration register.
cfg[0] selects the add status flag: 0 reports unsigned carry and 1
reports signed overflow. Modes are: 0 add, 1 multiply low byte,
2 quotient, and 3 multiply high byte. Quotient results come from the staged
Detronyx MDU byte-divide RTL path and settle after the divider pipeline has
accepted the selected slot operands.
How to test
Select a task slot, write A and B, then load the desired mode. uo_out[7:0]
shows the selected result for the active slot. uio[7:6] report the selected
bank, uio[5:4] report the selected mode, and uio[3] is a mode-specific
status flag: add carry/overflow selected by cfg[0], divider divide-by-zero,
or multiplier high-byte nonzero. uio[2:0] remain command inputs.
The cocotb regression covers add carry and signed overflow selection, multiply
low/high byte outputs, multiply high-byte-nonzero status, divider quotient, and
divider divide-by-zero status. The GF180MCU AS 3.3 V hardening flow uses a
project SDC with explicit I/O delay, clock uncertainty/transition, fanout,
transition, and capacitance constraints. KLayout DRC is enabled with the
generated standalone GF180 5LM runset in src/klayout_drc/gf180mcu_5lm_full.drc.
The KLayout checker is non-gating for now because the GF180 deck reports
CO.6a contact/Metal1 end-of-line hits inside the PDK standard cell
gf180mcu_as_sc_mcu7t3v3__aoi211_2; the report is still emitted for review.
External hardware
None.
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | data[0] | result[0] | cmd[0] |
| 1 | data[1] | result[1] | cmd[1] |
| 2 | data[2] | result[2] | cmd[2] |
| 3 | data[3] | result[3] | status |
| 4 | data[4] | result[4] | mode[0] |
| 5 | data[5] | result[5] | mode[1] |
| 6 | data[6] | result[6] | bank[0] |
| 7 | data[7] | result[7] | bank[1] |