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LCD PC E
LCD PC E
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8590 MAINTENANCE
8590 MAINTENANCE
1.2.2 CPU – Intel Celeron Processor In Micro-PGA 478 Package
The Intel® Celeron® processor in the 478-pin package utilizes Flip-Chip Pin Grid Array (FC-PGA2) package
technology, and plugs into a 478-pin surface mount, Zero Insertion Force (ZIF) socket, referred to as the
mPGA478B socket. The Celeron processor in the 478-pin package maintains the tradition of compatibility with IA-
32 software. The Celeron processor in the 478-pin package is designed for uni-processor based Value PC desktop
systems. Features of processor include hyper pipelined technology, a 400 MHz system bus, and an execution trace
cache. The 400 MHz system bus is a quad-pumped bus that is clocked with a 100 MHz system clock, making 3.2
GB/sec data transfer rates possible. The execution trace cache is a first level cache that stores approximately 12k
decoded micro-operations, which removes the decoder from the main execution path. Additional features include
advanced dynamic execution, advanced transfer cache, enhanced floating point and multi-media unit, and Streaming
SIMD Extensions 2 (SSE2). The advanced dynamic execution improves speculative execution and branch prediction
internal to the processor. The advanced transfer cache is a 128 KB, on-die level 2 (L2) cache. The floating point and
multimedia units have 128 bit wide registers with a separate register for data movement. Finally, SSE2 support
includes instructions for double-precision floating point, SIMD integer, and memory management. Power
management capabilities such as AutoHALT, Stop-Grant, Sleep, and Deep Sleep have also been retained. The
Celeron processor in the 478-pin package 400 MHz system bus utilizes a split-transaction, deferred reply protocol.
This system bus is not compatible with the P6 processor family bus. The 400 MHz system bus uses Source-
Synchronous Transfer (SST) of address and data to improve throughput by transferring data four times per bus clock
(4X data transfer rate, as in AGP 4X). Along with the 4X data bus, the address bus can deliver addresses two times
per bus clock, and is referred to as a “double-clocked” or 2X address bus. Working together, the 4X data bus and 2X
address bus provide a data bus bandwidth of up to 3.2 GB/second. Intel will be enabling support components for the
Celeron processor in the 478-pin package including a heatsink, heat sink retention mechanism, and socket.
Manufacturability is a high priority; hence mechanical assembly can be completed from the top of the motherboard
and should not require any special tooling. The processor system bus uses a variant of GTL+ signaling technology
called Assisted Gunning Transceiver Logic (AGTL+) signalling technology.