1-16 Technical Information
The chip features include:
USB Specification Rev 1.0
Open HCI Specification Rev 1.0a.
256K X Flash ROM
The N28F002BC-90 flash ROM is a 32-pin, plastic lead chip carrier (PLCC). The chip al-
lows easy updates to the system's BIOS if needed. More specifically, the ROM is flashed
electronically, 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 pro-
cedures.
The N28F002BC-90 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 (for PC cards,
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.
The ROM BIOS contains both the system and video BIOS. The system BIOS is located in
the upper portion of the device; video BIOS is located in the lower portion. System BIOS
is located between 00F0000h-000FFFFFh.
The BIOS often changes after the product release to provide enhanced features or bug
fixes. To acquire the latest BIOS release, the ROM is flashed electronically allowing the
BIOS update to occur without removing the ROM. See Section 2, Setup and Operation, for
BIOS upgrade procedures.