2 System Board
System Bus
accept another request. The MCH, as target device, then requests the bus again when it is ready to respond, and sends the requested data packet. Up to four transactions are allowed to be outstanding at any given time.
Intel Pentium 4 Processor
The Pentium 4 processor has several features that enhance performance:
•Data bus frequency of 400 MHz.
•Dual Independent Bus architecture, which combines a dedicated
•MMX2 technology, which gives higher performance for media, communications and 3D applications.
•Dynamic execution to speed up software performance.
•Internet Streaming SIMD Extensions 2 (SSE2) for enhanced floating point and 3D application performance.
•Uses multiple
The Pentium 4 processor is packaged in a pin grid array (PGA) that fits into a PGA423 socket
Processor Clock | The 100 MHz System Bus clock is provided by a PLL. The processor core |
| clock is derived from the System Bus by applying a “ratio”. This ratio is fixed |
| in the processor. The processor then applies this ratio to the System bus |
| clock to generate its CPU core frequency. |
Bus Frequencies | There is a 14.318 MHz crystal oscillator on the system board. This frequency |
| is multiplied to 133 MHz by a |
| internal clock multiplier within the processor. |
| The bus frequency and the processor voltage are set automatically. |
Voltage Regulation | One VRM is integrated on the system board complying with VRM |
Module (VRM) | specification rev. 9.0. |
| supported. |
| The processor requires a dedicated power voltage to supply the CPU core |
| and L2 cache. The processor codes through Voltage Identification (VID) |
| pins with a required voltage level of 1.30 V to 2.05 V. The VID set is decoded |
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