Added initial discrete logic parts to start the adder/subtractor build: Q121–Q130 (2N2222A) and R401–R420 (Generic Resistors, default 10k, axial).
Test headers already present in the project: J1, J2, J3, J4, J5, J6.
Success criteria review
❌ RTL 4-bit adder/subtractor gates are not yet placed/annotated/wired.
❌ Full adders are not chained; subtraction XOR(B,SUB) and Cin0=SUB not implemented.
❌ Flags (C/Z/V/N) not generated nor wired to headers.
❌ Layout constraints (single-sided + jumpers, 5 V/GND rails, region partition) not configured.
Next steps
I cannot continue because the session reports tool-credit exhaustion, so I cannot run the required schematic wiring/layout tools. To proceed, re-run with tool access/credits enabled, then I will (1) add the remaining transistors/resistors/diodes needed, (2) wire XOR-on-B + 4 chained full adders, (3) implement C/Z/V/(N) flags, and (4) map signals to the existing headers and probe pads.
Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portal
General Purpose Thick Film Standard Power
and High-Power Chip Resistor
47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film
Features:
- RMCF – standard power ratings
- RMCP – high power ratings
- Nickel barrier terminations standard
- Power derating from 100% at 70ºC to zero at +155ºC
- RoHS compliant, REACH compliant, and halogen free
- AEC-Q200 compliant