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Hardware Functional Overview 3-3
The NEC Versa 2500 Series uses the Phoenix BIOS. The BIOS Setup program is an easy-
to-use system utility configuration that sets system parameters and copies them on the Flash
ROM chip with the system BIOS.
The Flash ROM chip also includes BIOS Power-On Self Test (POST) diagnostic and boot-
ing codes that tests the system components, initializes certain data structures, and boots the
operating system.
System Processor
The system processor function for the notebook is implemented on the system board using
an Intel P54CSLM-133 MHz processor chip. The processor operates in conjunction with
the RAM and ROM memory plus other system control logic (e.g. UMC 8486F) to process
software instructions (BIOS, Windows, applications).
The Intel P54CSLM microprocessor is a high performance 586-class CPU which is com-
patible with all the popular x86 operating systems including DOS, Windows, Windows NT,
Windows 95, UNIX, Novell, and OS/2. The super pipelined architecture of the integer unit
combined with single cycle execution, branch prediction, 16-Kbyte write-back cache, and
single cycle instruction decode results in true 586-class performance. These features result
in a 60 to 90 percent gain in processing speed compared to the Cyrix 486DX2-50.
Additionally, the P54CSLM CPU provides many power savings features making it ideal for
power sensitive systems like notebook computers. Aside from operating at 3.45V only, the
CPU clock can also be completely stopped. Moreover, the CPU automatically powers down
the FPU and other internal circuits when not in use. Fast entry and exit from the SMM
mode allows frequent use of the SMM feature without noticeable performance degradation.
Major Functional Blocks
The Intel P54CSLM, in a 320-pin TCP packaging, is divided into five major functional
blocks:
Integer Unit
Floating Point Unit
Cache Unit
Memory Management Unit
Bus Interface Unit
Instructions are executed in the Integer Unit pipeline and in the Floating Point Unit (FPU).
The Cache Unit stores the most recently used data and instructions and provides fast access
to this information for the Integer and Floating Point Units.
SOLD BY laptopia2005 DO NOT RESELL!!
SOLD BY laptopia2005 DO NOT RESELL!!