HFC-U Cologne Chip AG, HFC-U Datasheet - Page 4

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

Features
1
The HFC-U is an ISDN HDLC basic rate controller for so called „passive“ ISDN PC cards with
integrated interface to U-chip. It only needs a U-chip and an external SRAM to form a high
performance ISDN PC card. Most problems with passive ISDN PC cards as small FIFOs and
massive interrupt load for the host CPU are overcome by the HFC-U. So we call ISDN cards with the
HFC-U „semi-active“.
Additionally the HFC-U can be used as a microprocessor peripheral in non-PC applications.
The FIFOs of the HFC-U are realized with an external SRAM. Also an industrial standard serial
interface for telecom peripheral ICs is implemented. A U-chip is normally connected to this interface.
March 1997
Independent Read and Write HDLC-Channels f or 2 ISDN B-channels and one ISDN D-
channel
B1 and B2 transparent mode independently selectable
FIFO-depth: 4x 7.5 KByte (B-channel) and 2x 512 Byte (D-channel)
max. 31 HDLC frames (B-channel) and 15 HDLC frames (D-channel) per channel and
direction in FIFO
56 kbit/s restricted mode for U.S. ISDN lines selectable
PCM30 interface configurable to interface MITEL ST
GCI
direct 8 bit ISA-PC bus interface with buffers for ISA-databus
One of 6 interrupt channels on ISA-PC bus selectable by software
Only 2 I/O-addresses used on ISA-PC bus
programmable ISA-I/O-addresses
microprocessor interface compatible to Motorala bus and Siemens/Intel bus
Timer with interrupt and watchdog capability in processor mode
3-5V supply voltage
rectangular QFP 100 case
General description
TM
for interface to U-chip
TM
bus (MVIP
TM
), Siemens IOM2
HFC-U
TM
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