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

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

Features
1
The HFC-S is an ISDN S/T HDLC basic rate controller for so called „passive“ ISDN PC cards with
integrated S/T interface and PCM30 highway interface. It only needs 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-S. So we call ISDN cards with the
HFC-S „semi-active“.
Additionally the HFC-S can be used as a microprocessor peripheral in non-PC applications.
The FIFOs of the HFC-S are realized with an external SRAM. Also an industrial standard serial
interface for telecom peripheral ICs is implemented. Codecs are normally connected to this interface.
1.1
March 1997
Independent Read and Write HDLC-Channels for 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 fra mes (D-channel) per channel and
direction in FIFO
56 kbit/s restricted mode for U.S. ISDN lines selectable
full I.430 ITU S/T ISDN support in TE and NT mode
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 int erface compatible to Motorala bus and Siemens/Intel bus
simple DMA access to PCM30 interface for tone synthetisation
Timer with interrupt and watchdog capability in processor mode
3-5V supply voltage
rectangular QFP 100 case
General description
Applications
ISDN PC card
ISDN terminal adapter
ISDN PABX
ISDN modems
TM
for external codecs
TM
bus (MVIP
TM
), Siemens IOM2
HFC-S
TM
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