Functional Description
CPB902
C P B 9 0 2 U s e r M a n u a l
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Base addresses of COM3-COM6 ports can be changed by bits 5, 6 of COM_ID identification
register, the ID register address itself changes along with it.
By default, the LPT port is set to ECP mode and has base address 378h.
System I/O ports allocated in 000h–0FFh range have standard IBM PC addressing. Non-standard
ports within 300h–31Fh range are used for module resource management. FPGA ports description
is presented in the table below.
Attention!
FPGA ports description is intended for use by system programmers.
Application programs should not address these ports!