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Frame Relay for Sangoma Cards (C) Sangoma Technologies Inc. 1999,2000,2001 Page 62 of 78
8.
Transmitting and receiving information frames
Accessing memory on the S508 adapter
The adapter presents an 8K memory window to the host PC and this window may be moved by the
application in order to be able to access various areas of adapter memory.
The 8K window is adjusted by writing a specified value out to the port address
adapter base I/O port + 2
as follows:
Value to be
written to I/O base
port + 2
Adapter memory
accessed
0x00
0x00000 - 0x01FFF
0x01
0x02000 - 0x03FFF
0x02
0x04000 - 0x05FFF
0x03
0x06000 - 0x07FFF
0x04
0x08000 - 0x09FFF
0x05
0x0A000 - 0x0BFFF
0x06
0x0C000 - 0x0DFFF
0x07
0x0E000 - 0x0FFFF
0x08
0x10000 - 0x11FFF
0x09
0x12000 - 0x13FFF
0x0A
0x14000 - 0x15FFF
0x0B
0x16000 - 0x17FFF