Enum M2Phase 

pub enum M2Phase {
    Low,
    High,
}

Convention for the M2-phase reference relative to the CPU cycle’s 3 PPU dots.

In silicon the 6502 cycle has two halves — φ1 (M2 low; address valid; memory access) and φ2 (M2 high; data latch; interrupt sample). The host scheduler ticks the PPU 3 dots per CPU cycle. The convention this crate adopts:

• M2Phase::Low — the first half of the cycle: from the start of the bus’s per-cycle tick through the end of PPU sub-dot 1 (corresponds to silicon’s φ1).
• M2Phase::High — the second half of the cycle: from the end of PPU sub-dot 1 through end-of-cycle (corresponds to silicon’s φ2). The M2-rising boundary lives between sub-dot 1 and sub-dot 2.

At end-of-cycle the bus advances its cycle counter and the phase resets to M2Phase::Low for the next cycle.

This is the canonical reference enum used by the docs/ADR, by the IRQ-timing tracing fixture (rustynes_core::irq_trace), and by Bus::poll_irq_at_phase.

Variants

Low

M2 low (φ1): memory access window.

High

M2 high (φ2): IRQ/NMI sample window.

Implementations

impl M2Phase

pub const fn as_str(self) -> &'static str

CSV-friendly single-letter abbreviation.

Trait Implementations

impl Clone for M2Phase

fn clone(&self) -> M2Phase

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for M2Phase

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for M2Phase

fn eq(&self, other: &M2Phase) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for M2Phase

impl Eq for M2Phase

impl StructuralPartialEq for M2Phase