Control Subsystem
The control subsystem contains:
The central control unit (CCU), with its associated CACHE high-speed buffer
(HSB).
The main storage.
The storage control, equipped with a direct memory access (DMA).
The input/output control bus (IOC bus).
The DMA bus.
The MOSS input/output control bus (MIOC bus).
The channel adapters, possibly associated with two-processor switches (TPS).
Central Control Unit
The CCU can be initialized by loading the control program through a host channel
or a communication link, or from the controller hard disk. Data transfer between
the CCU and the main storage is achieved by the storage control and enhanced by
the high-speed buffer. Data is also transmitted directly between the main storage
and the high-speed line adapters via the DMA. The CCU utilization including cycle
|
stealing is measured by a cycle utilization counter. The instruction set is similar to
|
that of the IBM 3745-210/310/410/610.
For details, see
IBM 3745 Communication Controller: Principles of Operation,
SA33-0102.
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IBM 3745 Models 130, 150, 170: Introduction
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