Ternary Processor Architecture
+ T3ISA Instruction Set

Overview

This patent defines a processor architecture designed specifically for photonic-ternary hardware. Unlike binary processors retrofitted for ternary, every aspect of this design — from the instruction encoding to the register file to the execution pipeline — operates natively in balanced ternary.

The T3ISA (Ternary Three-State Instruction Set Architecture) uses 27-trit instruction words. Instructions operate on trit-width general purpose registers with addressing modes compatible with the ternary memory architecture defined in Thatte4.

The processor is built entirely from the optical-ternary gate library (Thatte2) and is the execution target for the ManiT compiler (Thatte6). It bridges the gap between physical ternary logic and software, providing the hardware/software interface.

Key Innovations

• 27-trit instruction word encoding with structured opcode, register, and immediate fields
• 9 general-purpose 27-trit registers (R0–R8) plus special registers (PC, SP, SR, LR)
• Status register with privilege level, scheduler state, interrupt, and I/O fields
• Instruction categories: data movement, arithmetic, logic, control flow, and system
• Three privilege domains (kernel, supervisor, user) encoded in balanced ternary
• Execution pipeline designed for the latency characteristics of photonic switching

Technical Approach

The T3ISA instruction set includes data movement (TLOAD, TSTORE), arithmetic (TADD, TSUB, TMUL), logic (TINV, TMIN, TMAX, TMAJ), control flow (TBRANCH, TCALL, TRET), and system operations (TSYS, TSTAT, THALT). Each instruction is encoded in a 27-trit word with a 6-trit opcode, 3-trit register fields, and a 12-trit immediate/address field.

The ternary register file provides 9 general-purpose registers — a natural choice since 3² = 9. Addressing is natively ternary: a 3-trit register address field can specify any of the 27 possible register indices, with 9 used for general purpose and the remainder reserved for special functions.

Verification

The T3ISA is the compilation target of the ManiT compiler (Thatte6). The full instruction set has been implemented in the T3ISA emulator, and the THATTEOS microkernel has been compiled to T3ISA machine code and executed to completion on the emulator, verifying correct instruction semantics and pipeline behaviour.

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