Research compiled March 2026
The 2C53T uses a Gowin GW1N-UV2 (identified by EEVblog user jbtronics, markings sanded by FNIRSI).
| Resource | Count | Notes |
|---|---|---|
| LUT4 | 2,304 | |
| Flip-Flops | 2,016 | |
| Block SRAM | 72 Kbit (9 KB) | 4 blocks |
| Shadow SRAM | 18 Kbit | |
| User Flash | 96 Kbit | Non-volatile |
| PLLs | 1 | |
| DSP/Multiplier Blocks | 0 | Only GW1N-4 and above have hardware multipliers |
| On-chip oscillator | Yes | 2.5–125 MHz |
| Configuration | Non-volatile (built-in flash) | No external config memory needed |
| Core voltage | Internal LDO (UV = Universal Voltage) | Accepts 1.8/2.5/3.3V, regulates to 1.2V internally |
| Speed grades | C6 (commercial), I5 (industrial) | Fabric speeds typically 150–200 MHz for simple logic |
UV = Universal Voltage. The FPGA has an integrated LDO regulator, so the board only needs a single supply rail (1.8V, 2.5V, or 3.3V). This simplifies power design in a battery-powered handheld — likely why FNIRSI chose it.
| Feature | Gowin GW1N-UV2 (2C53T) | Anlogic EF2L45 (FNIRSI 1013D) | Lattice LCMXO2-1200HC (Hantek 2D72) |
|---|---|---|---|
| LUTs | 2,304 | 4,480 | 1,280 |
| Flip-Flops | 2,016 | 4,480 | ~1,280 |
| Block RAM | 72 Kbit | 700 Kbit | ~64 Kbit |
| DSP Blocks | 0 | 15 (18x18) | 0 |
| PLLs | 1 | 1 | 1 |
| Non-volatile | Yes (built-in) | No (external flash) | Yes (built-in) |
The GW1N-UV2 is mid-tier for budget scopes — more capable than the Lattice in the Hantek, but much smaller than the Anlogic in the 1013D. FNIRSI clearly cost-optimized the 2C53T, pushing more processing to the GD32F307 MCU.
| Function | Est. LUTs | Est. FFs | Notes |
|---|---|---|---|
| ADC interface + clock generation | 200–300 | 100–200 | Capture data from ADC at 250 MHz |
| Dual-channel sample buffers | 300–500 | 200–400 | Write to BRAM, manage pointers |
| Timebase / decimation | 200–300 | 100–200 | Divide sample rate for slower timebases |
| Trigger (edge/level) | 100–200 | 50–100 | Threshold compare, edge detect |
| UART interface to MCU | 100–200 | 50–100 | Parse string commands, send responses |
| Misc control/status | 100–200 | 50–100 | Channel coupling, gain relays, etc. |
| Estimated total | ~1,000–1,700 | ~550–1,100 | |
| Estimated free | ~600–1,300 | ~900–1,450 |
Block RAM is likely mostly consumed by sample buffers (72 Kbit = 9 KB, enough for ~4,500 12-bit samples or ~9,000 8-bit samples across two channels).
| Trigger Type | Est. LUTs | Description |
|---|---|---|
| Pulse width | ~200 | Trigger when pulse is wider/narrower than threshold. Catches glitches |
| Runt | ~300 | Trigger on pulses crossing one threshold but not another |
| Dropout/timeout | ~150 | Trigger when signal goes quiet for N cycles |
| Serial pattern (I2C) | ~400–600 | Match a specific I2C address at hardware speed |
| Serial pattern (UART) | ~300–500 | Match a specific byte/character at wire rate |
| Serial pattern (SPI) | ~300–500 | Match a specific SPI byte on MOSI/MISO |
These are the highest-value additions because the MCU (120 MHz Cortex-M4) physically cannot do real-time trigger evaluation on a 250 MHz sample stream. Only the FPGA can.
| Function | Est. LUTs | Description |
|---|---|---|
| Hardware frequency counter | ~200–300 | Count zero crossings over gated interval. Far more accurate than software |
| PWM analyzer | ~200 | Continuous duty cycle + frequency measurement. Great for automotive/embedded |
| Min/max tracker | ~100–150 | Track min/max sample values in hardware between MCU reads |
| Function | Est. LUTs | Description |
|---|---|---|
| Logic analyzer mode | ~300–500 | Treat ADC data lines as 8-bit digital capture (speed-dependent on ADC wiring) |
| Equivalent-time sampling | ~200–300 | Build up high-resolution waveforms of repetitive signals beyond the real-time sample rate |
| Function | Why not |
|---|---|
| FFT | Needs multipliers (0 DSP blocks) and deep RAM. A 256-point FFT would consume the entire FPGA |
| FIR/IIR digital filters | Each multiply-accumulate costs ~300–400 LUTs in fabric. A 4-tap FIR would use all free space |
| Deep protocol decode buffers | Only 9 KB BRAM total. Can match patterns but can't store/decode full transactions |
| Waveform generation / DDS | Signal generator already uses MCU's built-in DAC; no benefit to moving it |
| Compression / encoding | No multipliers, insufficient RAM for meaningful buffering |
The most practical split for protocol-aware capture:
FPGA (250 MHz, real-time):
→ Watches raw sample stream continuously
→ Matches hardware trigger pattern (e.g., I2C start + address 0x48)
→ Fires trigger, captures sample window into buffer
MCU (120 MHz, post-capture):
→ Reads captured sample buffer from FPGA
→ Decodes full protocol transaction in software
→ Computes measurements, runs FFT
→ Renders everything on LCD
This is the same architecture used by Rigol, Siglent, and Keysight scopes — the difference is they have larger FPGAs with more trigger types. With ~600–1000 spare LUTs, the 2C53T could implement 3–4 advanced trigger types, which would already exceed anything in its price class.
Before any FPGA modifications are possible:
- Physical access to FPGA JTAG pins — need to locate test points or trace PCB connections
- Determine if security bit is set — if FNIRSI enabled readback protection, can't dump the existing bitstream (can still write new ones)
- Reverse-engineer or reimplement base gateware — either dump + decompile the stock bitstream, or rewrite from scratch based on the USART2 protocol RE
- Toolchain support — Gowin's proprietary IDE (GowinEDA, free license) supports GW1N-UV2. The open-source Apicula/Yosys/nextpnr flow does NOT yet support GW1N-UV2 (closest supported: GW1N-UV4)
- Testing infrastructure — need real hardware with JTAG connection to validate
If the GD32 has GPIO connections to the FPGA's JTAG or SSPI programming pins (not just USART2), the MCU could potentially bitbang a programming sequence. This would allow FPGA updates via the existing USB firmware update path — no separate JTAG programmer needed. Requires PCB trace analysis to determine feasibility.