System Resources And Maps; Memory Map; I/O Map - VersaLogic EBX-22 Reference Manual

Memory Map

The lower 1 MB memory map of the EBX-22 is arranged as shown in the following table.

I/O Map

The following table lists the common I/O devices in the EBX-22 I/O map. User I/O devices
should be added with care to avoid the devices already in the map shown in below.
Note
The I/O ports occupied by on-board devices are freed up when the device is
disabled in CMOS Setup. This does not apply to SPI and reserved registers.
EBX-22 Reference Manual

System Resources and Maps

Table 35: Memory Map
Start Address End Address
E0000h FFFFFh
D0000h DFFFFh
C0000h CFFFFh
A0000h BFFFFh
00000h 9FFFFh
Table 36: I/O Map
I/O Device
Reserved
ADC Data Registers
PLED and Product ID Register
Revision and Type Register
Video BIOS Select Register
Reserved
GPO
ADC, DIO, SPI Bit Bang Registers
Legacy SPI interface
IRQ, Resource ISA Enable Registers
SPI, DIO, ADC Mode Register
Watchdog Timer
Primary Hard Drive Controller
COM4 Serial Port
LPT1 Parallel Port
COM3 Serial Port
COM2 Serial Port
COM1 Serial Port
Comment
System BIOS
PCI or ISA BIOS
extensions or boot ROMS
Video BIOS
Video RAM
System RAM
Standard I/O Addresses
1B0h – 1BFh
1C0h – 1CFh
1D0h
1D1h
1D2h
1D3h
1D4h
1D5h – 1D7h
1D8h – 1DDh
1DEh
1DFh
1E0h – 1E3h
1F0h – 1F7h
2E8h – 2EFh
378h – 37Fh
3E8h – 3EFh
2F8h – 2FFh
3F8h – 3FFh
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