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21 Cards in this Set
- Front
- Back
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What is the role of Control Flags?
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Control flags control the CPU's operation
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Name all the Status Flags.
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They are the Overflow, Sign, Zero, Auxiliary Carry, Parity, and Carry flags.
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When is Carry Flag(CF) set?
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It is set when the result of an unsigned arithmetic operation is too large to fit into the destination.
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When is Overflow Flag (OF) set?
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When the result of a signed arithmetic operation is too large or too small to fit into the destination.
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When is the Sign Flag(SF) set?
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When the result of an arithmetic or logical operation generates a negative result.
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When is the Zero Flag set?
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When the result of an arithmetic or logical operation generates a result of zero.
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When is the Auxiliary Carry Flag set?
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When an arithmetic operation causes a carry from bit 3 to bit 4 in an 8-bit operand.
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When is the Parity Flag set? What is it used for?
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If the least significant byte in the result contains an even number of 1 bits. Otherwise, PF is clear. It is used for error checking when there is a possibility that data might be altered or corrupted.
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Why was the MMX technology implemented ?
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It was added onto the Pentium Processor (II) to improve performance of advanced multimedia and communications applications.
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What is the SIMD? What does it imply for MMX registers?
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It is the "single instruction, multiple data", a list of special instructions. MMX instructions then operate in parallel on the data values contained in MMX registers.
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What are XMM registers? How many are there and what is there bit size?
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They are used to stream SIMD extensions to the instruction set. There are 8 of them, each 128 bit registers in the x86 Architecture.
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What is the Floating-Point Unit?
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The FPU performs high-speed floating point arithmetic. There are 8 floating data registers.
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Why did the Intel 8086 processor mark the beginning of the modern Intel architecture family?
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It had many innovations such as the 16-bit registers and a 16-bit data bus and used a segmented memory model permitting programs to address up to 1MByte of RAM. It allowed more complex business applications to be made.
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Describe the Intel 80286 processor.
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It was the first intel processor to run in protected mode. It addresses up to 16MByte of RAM using 24-bit address bus.
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What processor model first used the protected mode?
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The intel 80286 processor.
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What are the two sub-modes of the IA-32e Mode?
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Compatibility mode, 64-bit mode.
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Describe the compatibility mode and memory characteristics.
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This mode permits legacy 16 bit and 32 bit applications to run without recompilation under 64 bit system.
It can address 4GByte addressable memory. |
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Describe the 64 bit mode.
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Uses 64-bit addresses, 64 bit (and 32 bit) operands, greater number of registers, and extensions to the instruction set to improve processing.
Memory augmentation is disabled. |
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What is hyper-threading technology?
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It allows two tasks to execute on a traditional processor at the same time.
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What does the Dual Core refer to?
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Refers to integrated circuit chips that contain two complete physical computer processor chips in the same IC package. Each has its own resources.
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Intel packages that contain more than two processors are called?
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Multi core
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