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101

Intel386™ EX EMBEDDED MICROPROCESSOR USER’S MANUAL

3-2

3.2 Intel386 CX PROCESSOR INTERNAL ARCHITECTURE

The internal architecture of the Intel386 CX processor consists of functional units that operate in

parallel. Fetching, decoding, execution, memory management and bus accesses for several in-

structions are performed simultaneously. This parallel operation is called pipelined instruction

processing. With pipelining, each instruction is performed in stages, and the processing of several

instructions at different stages may overlap, as shown in Figure 3-1. The pipelined processing of

the Intel386 CX processor results in higher performance and enhanced throughput rate over non-

pipelined processors.

Figure 3-1. Instruction Pipelining

Elapsed Time

Typical

Processor

386™ SX CPU/376™ CPU

Fetch 1 Decode 1 Execute 1 Fetch 2 Decode 2 Execute 2

Bus Unit

Fetch 1

Fetch 4

Fetch 2 Fetch 3

Store

Result 1

Fetch 5 Fetch 6

Decode 1 Decode 2 Decode 3 Decode 4 Decode 5

Decode

Unit

Execute 2 Execute 3 Execute 4

Execution

Unit

Execute 1

Addr &

MMU

Addr &

MMU

A2850-01

MMU

Intel386™ SX CPU/Intel376™ CPU

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 690 691

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Intel 386 Manuale Utente Pagina 45

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