Intel Pentium P54Lm Or P54Cslm; M-Triton System Controller; 256K X Flash Rom; Rom Bios - NEC VERSA 6000 Series Service Manual

Intel Pentium P54LM or P54CSLM

The 100 MHz, or 133 MHz Intel Pentium microprocessor used in the NEC Versa 6000 se-
ries computer is built on Intel's advanced 3.3V BiCMOS silicon technology. The CPU has
on-chip dual-processing, a local multiprocessor interrupt controller, and power management
features. NEC adopted the chip specifically for its pipelined Floating Point Unit (FPU), and
local interrupt management.

M-Triton System Controller

NEC implements Intel's Mobile Triton technology for several of the notebook's subsystems
including the DRAM controller, Second Level Cache Controller and PCI Bus interface. The
Mobile Triton PCIset features include:
hyper page mode DRAM support (7-3-3-3 Reads @ 66 Mhz, 32 MB expansion
memory board only)
direct mapped organization-write back policy
fully synchronous 33 Mhz PCI bus interface.

256K X Flash ROM

The N28F020 flash ROM is a 32-pin, plastic lead chip carrier (PLCC). The chip allows easy
updates to the system's BIOS if needed. More specifically, the ROM is flashed electroni-
cally, installing the latest BIOS revisions to the system. It is possible to reprogram the BIOS
up to 100,000 times. See Section 2, Setup and Operation, for BIOS update procedures.
The N28F020 provides the system upgrade capability as well as the following:
256 KB memory
Quick-Pulse Programming Algorithm
150 nanoseconds (ns) maximum access time
ETOX Nonvolatile flash technology
CMOS low power consumption

ROM BIOS

The system uses a Flash ROM known as the system's ROM BIOS to store machine lan-
guage programs. The BIOS size is 256 KB, consisting of the system utility (PCMCIA, Auto
Setup), system BIOS, video BIOS, and power management.
The BIOS programs execute the power-on self-test (POST), initialize CPU controllers, and
interact with the LCD indicator panel, diskette drive, hard drive, communication devices
and peripherals. The system BIOS also contains Auto Setup and provides VGA controller
support. The ROM BIOS is copied into RAM (shadowing) for optimum performance.
Technical Information 1-19