Motorola MPC8260 User Manual
MOTOROLA
Chapter 4. System Interface Unit (SIU)
4-1
Chapter 4
System Interface Unit (SIU)
System Interface Unit (SIU)
40
40
The system interface unit (SIU) consists of several functions that control system start-up
and initialization, as well as operation, protection, and the external system bus. Key features
of the SIU include the following:
and initialization, as well as operation, protection, and the external system bus. Key features
of the SIU include the following:
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System conÞguration and protection
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System reset monitoring and generation
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Clock synthesizer
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Power management
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60x bus interface
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Flexible, high-performance memory controller
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Level-two cache controller interface
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IEEE 1149.1 test-access port (TAP)
Figure 4-1.SIU Block Diagram
60x Bus (32-Bit Address/64-Bit Data)
Memory
Controller
PowerPC
Control
Memory
Controller
Local
Control
Local Bus (18-Bit Address/32-Bit Data)
Bridge
Core
Communications
Processor
Configuration Registers
Counters
Interrupt
Controller