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LCD PC E
LCD PC E
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8188 MAINTENANCE
8188 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.