Drewworks GBA-to-Switch Link Protocol Lab

Target Specimen:

Phase 1 Hardware Handshake SPI 256 kHz Sync & Level Shift

Phase 2 Room Negotiation Exchange 0x5FFF Trade Sync

Phase 3 Structure Transcoding 80B Gen3 → 344B Switch PK9

Phase 4 Verification & Commit Bidirectional Checksum Latch

GBA Cable Master (3.3V) EXT PORT: NORMAL 8-BIT

CABLE TRADE CLUB AWAITING LINK...

🔥

CHARIZARD Lv.70
OT: RED / ID: 01337
PID: 0x4A1F89C2

IV: 31/31/28/29/30/31 • EV: 252 Atk

• SIO Control: R_SIOCNT = 0x5083
• Baud: 256 kbps Master Clock Source
• Unencrypted Block: 80 Bytes Party Data

Drewworks Bridge Twin RP2040 + TXB0108

Level Shift: 3.3V ⇄ 5.0V / USB 256.00 kHz ± 0.05%

Switch Trade Lobby USB-C CDC / PK9 INGEST

LINK TRADE ROOM #0529 DISCONNECTED

❓

Incoming Slot...
Format: PK9 (Encrypted 344B)
Origin: Gen 3 Hoenn / Kanto

Awaiting 344-byte Envelope Payload

• Ingest Target: Scarlet / Violet (Gen 9 Native)
• Checksum Engine: CRC-16-CCITT Recalculated
• EV Bound Check: Total Max 510, Single Max 252

⚡ Real-Time Serial Timing Logic Analyzer Sample Rate: 2.048 MHz

T = 0.00 µs (Cursor: 0x5FFF Sync Frame)

Timeline Scrub: 0.0 µs

■ SC (Clock) ■ SI (In) ■ SO (Out) ■ SD (Detect)

Clock Drift Jitter 0.12 µs

Simulate GBA internal crystal frequency tolerance

Bit-Shift Transfer Latency 3.91 µs/bit

Adjusts SPI transfer period between GBA SIO shifts

Level Shifter Slew Rate 9.8 ns

Rise/fall timing across TXB0108 bi-directional buffer

Bus Glitch Parity Noise 0% (Normal)

Forces dropped link frames to test retry packet recovery

🔬 Live Bidirectional Packet Inspector Interactive byte segments map directly between Gen 3 and Switch structures

PID (Bytes 0-3) OT ID (Bytes 4-7) Nickname (Bytes 8-17) Moves/PP (Sub B) IVs/EVs (Sub C) Checksum (Bytes 28-29)

GBA Gen 3 Raw Party Block (80 Bytes) Checksum: 0x82A1 [VALID]