Power Management; I/O Addressing; System Memory Map - NEC POWERMATE VE - SERVICE MANUAL 08-1996 Service Manual

1-6 Technical Information
The Flash ROM allows the system and video BIOS to be upgraded with the BIOS Update
utility, without removing the ROM (see Section 2 for further information on the BIOS
Update utility). The Flash ROM supports the reprogramming of the system BIOS and the
video BIOS.
The system memory map is shown in Table 1-3.
Memory Space
FFF80000-FFFFFFFF
04000000-07FFFFFF
01000000-03FFFFFF
00F00000-00FFFFFF
00100000-00EFFFFF
000F0000-000FFFFF
000C8000-000EFFFF
000C0000-000C7FFF
000A0000-000BFFFF
00080000-0009FFFF
00000000-0007FFFF

Power Management

Each system incorporates power management features that lower power consumption when
there is no activity detected from the keyboard, mouse, diskette drive, CD-ROM reader, or
hard disk drive after a predefined period of time. As soon as activity is detected the system
resumes where it left off.
With Power Management enabled (shipped enabled), the system automatically activates the
power-saving features and enters a suspend mode whenever inactivity is sensed.

I/O Addressing

The processor communicates with I/O devices by I/O mapping. The hexadecimal (hex)
addresses of I/O devices are listed in Table 1-4.
Table 1-3 System Memory Map
Size Function
512 KB BIOS ROM
64 MB L2 cache (Non-Cacheable with less than 512 KB
SRAM)
L1 cache (Cacheable)
48 MB Always cachable
1 MB Optional memory space gap
14 MB Cachable
64 KB System BIOS (Shadowed in DRAM)
160 KB Expansion region (Shadowed in DRAM)
32 KB Video BIOS (Shadowed in DRAM)
128 KB Video Buffer (SMM space Non-Cacheable)
128 KB Optional memory space gap (DOS Apps)
512 KB DOS applications (No read/write protect) (Always
cacheable)