Memory Organisation¶
The arrangement of memory banks, word widths, addressing, and buses that governs how computer main memory supplies data and programs to a cache.
Core Idea¶
Memory organisation is the physical-and-logical arrangement by which a computer's main memory serves the cache: word width, bank structure, address-to-bank mapping, buses, and selection logic jointly determine what data can move on an access.
One-word-wide, wide, and interleaved arrangements do not merely rename capacities. They offer different combinations of transfer width and bank activity, and their performance depends on request patterns and timing rather than on bank count alone.
Scope of Application¶
This concerns the organization of main-memory storage and transfer paths serving cache or processor requests.
- Computer architecture. Compares one-word, wide, and interleaved arrangements by bank, data width, and interconnect.
- Memory-controller design. Follows address bits into bank selection and determines which requests can proceed together.
- Cache-line transfer. Relates a requested block to the number and width of memory-to-cache transfers.
- Performance analysis. Tests latency and throughput against access patterns and controller timing rather than architecture labels alone.
Clarity¶
Specify what is wide—a chip, bank, bus, or whole module—and trace how addresses reach storage and data reach the cache. Capacity, transfer width, and sustainable throughput are different quantities. This entry concerns main-memory units and their transfer paths, not the entire memory hierarchy, a cache replacement policy, or a storage-size label. An interleaved bank map may improve overlap for one request stream yet yield little benefit for another.
Manages Complexity¶
A memory access traverses addresses, banks, buses, multiplexers, and cache ports. The organization abstraction reduces these details to two key questions—where is the requested word and how wide or available is its path—while retaining timing constraints. That separation keeps a wider bus, more banks, and faster effective service from being treated as equivalent claims.
Abstract Reasoning¶
Begin with the cache request and its address sequence, map each word to a bank, and trace the available bus and selection path. Compare transfers and bank overlap under the controller's actual timing; an interleaved or wide arrangement is not automatically faster for every workload. Keep storage capacity, instantaneous width, and sequence-dependent throughput as separate outputs of the comparison.
Knowledge Transfer¶
Bank–mapping–path analysis transfers literally among main-memory implementations that supply a cache or processor: one-word, wide, and interleaved layouts are alternative role assignments. What travels is the trace from an address through bank selection and transfer capacity to observed request service. Prime interleaving captures only alternating placement, not the full bus and controller arrangement. The method stops at a different storage level or a software layout unless corresponding physical roles are demonstrated.
Relationships to Other Abstractions¶
Current abstraction Memory Organisation Domain-specific
Parents (1) — more general patterns this builds on
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Memory Organisation presupposes Data Structure Prime
Memory organization presupposes structured addressing and arrangement of stored data words.
Hierarchy path (1) — routes to 1 parentless root
- Memory Organisation → Data Structure → Trade-offs → Constraint
Neighborhood in Abstraction Space¶
Memory Organisation sits in a moderately populated region (46th percentile for distinctiveness): it has near-neighbors but no dense thicket of look-alikes.
Family — Computer Systems & Network Architecture (20 abstractions)
Nearest neighbors
- Protection Ring — 0.86
- Layered Queueing Network — 0.86
- Network Transparency — 0.86
- Wang B-machine — 0.86
- Exit Status — 0.86
Computed from structural-signature embeddings · 2026-10-08