YAM is a micro-controller core aiming at simple yet fast IO sequencing with integer processing capabilities.

The YAM specification has been driven by a few basic ideas.

• Scalable data width from 8 bits to any (like 32 and larger) size.
• Possibly a large number of registers (up to 128 of them).
• Deterministic execution times (no pipeline).
• No privileged mode (definitely a micro-controller style).
• Highly configurable to meet different requirements.
• Keep compact in area and preserve fast clocking, avoiding superfluous sophistication.

Therefore the base instruction list is restricted to a minimal set of instructions. Even the possible extensions have been carefully analyzed against new functionality versus area/speed cost.

• YAM is described in VHDL.
• YAM is software supported by an assembler, yamasm.

Architecture of YAM

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