S3C44B0X

Manufacturer Part NumberS3C44B0X
DescriptionBGA
ManufacturerSamsung
S3C44B0X datasheets
 


Specifications of S3C44B0X

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S3C2400 RISC MICROPROCESSOR
CLOCK & POWER MANAGEMENT
6
CLOCK & POWER MANAGEMENT
OVERVIEW
The clock & power management unit consists of 3 parts, clock control, USB control, and power control.
The Clock control logic in S3C2400 can generate the required clock signals, FCLK for CPU, HCLK for the AHB bus
peripherals, and PCLK for the APB bus peripherals. There are two PLL in S3C2400. One is for FCLK,HCLK, and
PCLK, the other is dedicated for USB block (48MHz). The clock control logic can make slow clock without PLL and
connect/disconnect the clock to each peripheral block by S/W, which will reduce the power consumption.
In the power control logic, S3C2400 has various power management schemes to keep optimal power consumption
for a given task. The power management in S3C2400 consists of five modes: NORMAL mode, SLOW mode, IDLE
mode, STOP mode and SL_IDLE mode for the self-refresh mode LCD.
NORMAL mode is used to supply clocks to CPU as well as all peripherals in S3C2400. In this case, the power
consumption will be maximized when all peripherals are turned on. The user can control the operation of peripherals
by S/W. For example, if a timer is not needed, the user can disconnect the clock to the timer to reduce power.
SLOW mode is non-PLL mode. Unlike the Normal mode, the Slow mode uses an external clock (XTIpll or EXTCLK)
directly as FCLK in S3C2400 without PLL. In this case, the power consumption depends on the frequency of the
external clock only. The power consumption due to PLL itself is excluded.
IDLE mode disconnects the clock (FCLK) only to CPU core while it supplies the clock to all peripherals. By using
IDLE mode, power consumption due to CPU core can be reduced. Any interrupt request to CPU can wake-up from
Idle mode.
STOP mode freezes all clocks to the CPU as well as peripherals by disabling PLLs. The power consumption is only
due to the leakage current in S3C2400, which is uA unit. The wake-up from STOP mode can be done by activating
external interrupt pins or RTC alarm.
SL_IDLE mode causes the LCD controller to work. In this case, the clock to CPU and all peripherals except LCD
controller should be stopped, therefore, the power consumption in the SL_Idle mode is less than that in the Idle
mode.
6-1