1. Key Technical Specifications Comparison
The Muon HBM4 Series logic base die extends standard JEDEC JESD270-4 physical layer specifications with dynamic hardware preemption and priority-aware out-of-order execution.
| Parameter | Muon HBM4 Series IP Core | Standard JEDEC HBM4 Baseline | Architectural Advantage |
|---|---|---|---|
| Physical PHY Bus Width | 2048-bit Wide Data Bus | 2048-bit Wide Data Bus | 100% JEDEC Pin-Compatible |
| Peak Bandwidth | 2.048+ TB/s per stack | 1.64 TB/s per stack | +25% Effective Bandwidth Boost |
| Critical Read Latency | < 1.8 ns (Preempted) | 45.0 – 100.0 ns (Refresh Stalled) | 20x Latency Reduction |
| Granularity | 256-Byte Micro-Flits (8 Beats) | Fixed 64/128-Byte Bursts | Optimized for LLM KV-Cache Lookups |
| Reorder Buffer (ROB) | 128-Entry Priority OOO Commit | Sequential FIFO / Round-Robin | Zero Head-of-Line Blocking |
| Refresh Abort Overhead | < 2 Clock Cycles (< 2ns) | Non-Preemptible tRFC Pause | Guaranteed Sub-Microsecond SLA |
| PHY I/O Voltage (VDDQ) | 0.40 V Ultra-Low Voltage | 0.70 V Standard | Up to 35% PHY Power Savings |
2. APB Control & Status Register Map (Sideband Bus)
Host CPUs and management SoCs configure threshold levels, monitor hardware counter status, and manage dynamic power states via the APB sideband interface.
| Address Offset | Register Name | Access | Reset State | Description |
|---|---|---|---|---|
| 0x0000 | DEV_ID_REV |
RO | 0x48424D34 | Device ID (HBM4 Magic) & Silicon Revision Identifier |
| 0x0004 | CTRL_CFG |
RW | 0x00000003 | Core Enable, Refresh Preemption Master Enable, Micro-Flit Mode |
| 0x0008 | PRIO_THRESH |
RW | 0x0000000C | Critical Priority Threshold Level (Default: Prio 12 for LLM attention) |
| 0x000C | ROB_STATUS |
RO | 0x00000000 | Current ROB Allocation Depth, High Watermark, Full/Empty Flags |
| 0x0010 | PREEMPT_CNT |
RO | 0x00000000 | Hardware Counter tracking total refresh preemption events triggered |
| 0x0014 | DVFS_PSTATE |
RW | 0x00000000 | Dynamic Voltage & Frequency Scaling Power State (P0 Full Boost to P3 Sleep) |
3. Silicon PDK & Packaging Parameters
Commercial Production PDK
Targeted for advanced 3nm/4nm logic nodes with CoWoS-S/L 2.5D interposers and 3D hybrid bonding.
- Foundry Node: TSMC N3P / N4P Base Die
- Est. Die Area: ~0.0122 mm² (Base IP Core)
- Operating Frequency: 1.0 GHz to 1.6 GHz Core Clock
Open MPW Test-Chip PDK
Fully synthesized and configured for open silicon shuttle tapeouts on Efabless Caravel frame.
- Foundry Node: SkyWater 130nm (`sky130A`)
- Die Area Footprint: 7.435 mm² (72.4% Caravel Frame Fit)
- Verification Status: 100% Passing Gate-Level Netlist