Motorola MPC8260 - Manual (Page 139)

MOTOROLA Chapter 4. System Interface Unit (SIU) 4-1
Chapter 4
System Interface Unit (SIU)
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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:
¥ System conÞguration and protection
¥ System reset monitoring and generation
¥ Clock synthesizer
¥ Power management
¥ 60x bus interface
¥ Flexible, high-performance memory controller
¥ Level-two cache controller interface
¥ IEEE 1149.1 test-access port (TAP)
Figure 4-1 is a block diagram of the SIU.
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