Fastwel CPB904, Руководство пользователя

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Functional Description CPB904
4.2 Address Mapping
4.2.1 Memory Addressing
Table 4.1: Memory Address Mapping
Address Range Size Description
00000h – 09FFFh 640 KB System memory
A0000h – BFFFFh 128 KB Video memory
C0000h –
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7FFFh 32 KB Display BIOS memory or external bus memory
C8000h – DBFFFh 80 KB External bus memory
DC000h – DFFFFh 16 KB SMI handler
E0000h – FFFFFh 128 KB System BIOS area
100000h – FFFFFFFh 255 MB Extended system memory
FFFFFFFFh – 10007FFFFh 512 KB ROM BIOS area
4.2.2 I/O Addressing
Table 4.2: I/O Address Space
Address Range Function Note
0000h – 001Fh DMA1 –
0020h – 0021h PIC master –
0022h – 0023h LX configuration –
0028h – 002Fh Local bus –
0040h – 005Fh Timer –
0060h – 006Fh POST, keyboard shadow registers –
0070h – 007Fh CMOS, NMI mask control registers –
0080h – 009Fh DMA page registers –
00A0h – 00BFh Slave PIC –
00C0h – 00DFh DMA2 –
00F0h – 00FFh Numeric coprocessor –
0100h – 016Fh External 16-bit ISA bus External bus access
0170h – 0177h Reserved –
0180h – 01EFh External 16-bit ISA bus External bus access
01F0h – 01F7h Primary IDE –
0200h – 020Ah External 16-bit ISA bus External bus access
020Bh – 020Fh CPB904 control registers –
0210h – 026Fh External 16-bit ISA bus External bus access
0270h – 027Fh Reserved –
0280h – 02E7h External 16-bit ISA bus External bus access
02E8h – 02EFh Reserved –
C P B 9 0 4 U s e r M a n u a l
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