Kontron MSM800XEL - Manual (Page 54)

MSM800XEV/XEL / Detailed System Description
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CPU GEODE:
Address Size Function / Comments
000000 - 09FFFFh 640kByte Onboard DRAM for DOS applications
0A0000 - 0BFFFFh 128kByte CGA, EGA, LCD Video RAM 128kB
0C0000 - 0C7FFFh
0C8000 - 0CFFFFh 32kByte
32kByte VGA BIOS
Free for user
0D0000 - 0DFFFFh 64kByte Free for user
0E0000 - 0EBFFFh
0EC000 - 0EFFFFh 32kByte
16kByte BIOS
BIOS extensions
0F0000 - 0FFFFFh 64kByte Core BIOS
100000 - 1FFFFFFh 31MByte DRAM for extended onboard memory
6.13.2 System I/O Map
The following table details the legacy I/O range for 000h through 4FFh. Each I/O location has a read/write (R/W)
capability.6565656565
Note the following abbreviations:
--- Unknown or cannot be determined.
Yes Read and write the register at the indicated location. No shadow required.
WO Write only. Value written can not be read back. Reads do not contain any useful information.
RO Read only. Writes have no effect.
Shw The value written to the register can not be read back via the same I/O location. Read back is accomplished via
a "Shadow" register located in MSR space.
Shw@ Reads of the location return a constant or meaningless value.
Shw$ Reads of the location return a status or some other meaningful information.
Rec Writes to the location are “recorded” and written to the LPC. Reads to the location return the recorded value.
The LPC is not read.
I/O Map:
I/O Address Function Size R/W Comment
000h Slave DMA Address - Channel 0 8bit Yes 16bit values in two transfers.
001h Slave DMA Counter - Channel 0 8bit Yes 16bit values in two transfers.
002h Slave DMA Address - Channel 1 8bit Yes 16bit values in two transfers.
003h Slave DMA Counter - Channel 1 8bit Yes 16bit values in two transfers.
004h Slave DMA Address - Channel 2 8bit Yes 16bit values in two transfers.
005h Slave DMA Counter - Channel 2 8bit Yes 16bit values in two transfers.
006h Slave DMA Address - Channel 3 8bit Yes 16bit values in two transfers.
007h Slave DMA Counter - Channel 3 8bit Yes 16bit values in two transfers.
008h Slave DMA Command/Status - Channels [3:0] 8bit Shw$
009h Slave DMA Request - Channels [3:0] 8bit WO Reads return value B2h.
00Ah Slave DMA Mask - Channels [3:0] 8bit Shw@ Reads return value B2h.
00Bh Slave DMA Mode - Channels [3:0] 8bit Shw@ Reads return value B2h.
00Ch Slave DMA Clear Pointer - Channels [3:0] 8bit WO Reads return value B2h.
00Dh Slave DMA Reset - Channels [3:0] 8bit WO Reads return value B2h.
00Eh Slave DMA Reset Mask - Channels [3:0] 8bit Shw@ Reads return value B2h.
00Fh Slave DMA General Mask - Channels [3:0] 8bit Shw@ Reads return value B2h.
010h-01Fh No specific usage --- ---
020h PIC Master - Command/Status 8bit Shw$
021h PIC Master - Command/Status 8bit Shw$