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Functions
The HFC-S is a HDLC B- and D-channel controller with integrated S/T interface.
It can be used for ISDN basic rate lines. All channels (2B+D) are served
fully duplex by six deep FIFOs. Also implemented is a PCM30 highway interface,
which is able to connect to MITEL STTM bus (MVIPTM),
Siemens IOM2TM or GCITM bus and a microprocessor
interface.
Features
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FIFO-Depth:
B-channel: 4x 7.5 KByte, maximum 31 HDLC frames per FIFO
D-channel: 2x 512 Byte, maximum 15 HDLC frames per FIFO
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independent read/write HDLC-channels for two ISDN B-channels and one ISDN
D-channel
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56 KBit/s restricted mode for U.S. ISDN lines selectable by software
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full I.430 ITU S/T ISDN support in TE and NT mode
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PCM30 interface configurable to interface MITEL STTM bus (MVIPTM),
Siemens IOM2TM or GCITM for external CODECs
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direct 8 bit ISA-PC bus interface with buffers for ISA data bus; one of
6 interrupt channels selectable by software
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microprocessor interface compatible to Motorola bus and Siemens/Intel bus
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only 2 I/O addresses used on PC ISA bus; I/O addresses programmable (no
memory mapping, no DMA)
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CMOS technology 3V-5V, case QFP 100
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