HFC-U Cologne Chip AG, HFC-U Datasheet - Page 5

• Manufacturer Part Number: HFC-U
• Description: Isdn HDLC Basic Rate Controller
• Manufacturer: Cologne Chip AG

1.1
Figure 1: HFC-U block diagram
1.2
The HFC-U has 4 different bus modes, which can be selected by the lines ALE and IIOSEL0-
IIOSEL3.
Depending on the selected mode the function of several pins is different (see:
1.2.1 ISA-PC mode
Mode 1:
In mode 1 the HFC-U is addressed by two successive port addresses on the ISA-PC bus. The port
address is selected by the lines SA0 - SA9.
The address with SA0='1' is for register selection and the address with SA0='0' is used for data
read/write (see also: 3.1).
March 1997
Applications
ISDN PC card
ISDN terminal adapter
ISDN PABX
ISDN modems
Mode description
ALE to GND, IIOSEL3-0 from 0001 to 1111
Pin description
HFC-U
).
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