bios smps hardware workshop
TRANSCRIPT
>>>:::KICK START :::>>>SMPS
BIOS
SMPS• A switched-mode power supply (also
switching-mode power supply, SMPS, or simply switcher)
• Electronic power supply unit (PSU) that incorporates a switching regulator in order to provide the required dc output voltage .
• AC DC• Heat management of the PC
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SWITCHER TECHNOLOGY
• Reduction in size of power supply components
• AC DC : A 3 step process 1. AC source voltage to higher frequency2. Lowering of AC voltage by transformer3. Conversion to DC by rectifier
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ATX : THE STANDARD
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• The output rating of a modern computer power supply ranges anywhere from 185 W to 2 kW
• PSU over 400W are used mainly for Extreme Gaming
• standard desktop PC PSU produces the following DC voltages:
+5V, +3.3V, +12V1, +12V2, -12V and a standby 5V .
SMPS : CONNECTIONS
BIOS : AN INTRO
• BIOS stands for Basic I/O system• BIOS could be stored in different
types of ROM• But Flash BIOS chips are preferred• REASON : the electrically erasable
PROM (EEPROM) chips are cheaper and easier to program than standard PROM.
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BIOS : ROLE
• Interface b/w hardware and software• Firmware• Designed to be the first code run by
a PC when powered on• Bootstrapping : A Simple computer
program activates a more complicated system of programs
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BIOS : FUNCTIONS
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POST
Activation
Interface
Settings
BIOS : FUNCTIONS
• POST : A power-on self-test (POST) is done for all of the different hardware components in system to make sure everything is working properly
• Activating other BIOS chips on different cards installed in the computer For example, SCSI and graphics cards often have their own BIOS chips.
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BIOS : FUNCTIONS• Providing a set of low-level routines
that the operating system uses to interface to different hardware devices to control the Keyboard, the screen, etc., especially when the computer is booting.
• Managing a collection of settings for the hard disks, clock, etc.
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BIOS : SEQUENCE
1. Check the CMOS Setup for custom settings
2. Load the interrupt handlers and device drivers
3. Initialize registers and power management
4. Perform the power-on self-test (POST) 5. Display system settings6. Determine which devices are bootable 7. Initiate the bootstrap sequence
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QUERY TIME ??
ER
QU
ME
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YTI ?
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ABHISHEK ANAND
HARISHANKAR
PURUSHOTTAM
PRABHAT K GUPTA
PRANSHU VERMA
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