Samsung S5PC100, User Manual, Page: 280 / 1863

INTELLIGENT ENERGY MANAGEMENT S5PC100 USER’S MANUAL (REV1.0)
2.5-8
2.1.4 Power Management Unit
In S5PC100X, the Power Management Unit (PMU) supports IEM features. The PMU provides the IEC with
configuration information, for example:
•
fractional index map, indicating the fractional levels supported
•
performance map, providing the mapping of the performance levels onto the clock frequencies supported by
the CMU
•
maximum processor performance.
2.1.5 Clock Management Unit
In S5PC100X, Clock Management Unit (CMU) in System Controller supports Dynamic Clock Generation.
The CMU receives target performance requests from the IEC, via Power Management Unit (PMU). It generates
the necessary clocks for the CPU, for example:
•
processor clock
•
peripheral clocks
•
AMBA clock.
Additionally, for a more efficient design, the CMU must be capable of generating the different performance levels
as indicated by the IEC. The CMU can also be a memory mapped AMBA peripheral and can contain both control
and status registers.
The design of the CMU must meet the requirements set by the IEC and the Advanced Power Controller (APC1).
These constraints are necessary to ensure optimum and correct performance of the Hardware Performance
Monitor (HPM).
2.1.6 Power Supply Unit supporting Dynamic Voltage Scaling
The Power Supply Unit (PSU) is the only off-chip component. The PSU provides the requested voltage to the
SoC. It interfaces to the DVC through an interface such as the PWI. It ensures that the voltage targets specified
by the DVC are provided to the SoC.