W6694 Datasheet, PDF (4/33 Pages) Winbond – USB Bus ISDN S/T-Controller

Preliminary W6694
1. GENERAL DESCRIPTION
The Winbond's single chip USB bus ISDN S/T interface controller W6694 is an all-in-one device
suitable for ISDN Internet access. The integrated USB and ISDN design provides low cost, pure
passive solution for USB-IDSN application.
W6694 also provides two PCM CODEC interfaces for the ability to access ISDN through voice
channel.
2. FEATURES
ISDN
• Full duplex 2B+D S/T-interface transceiver compatible with ITU-T I.430 Recommendation
− Four wire operation
− Received clock recovery
− Layer 1 activation/deactivation procedure
− D channel access control
• Transparent data transmission of 2B+D channels
• Test functions
USB
• USB Specification version 1.0/1.1 compliant
• Full-speed, bus-powered USB device
• Integrated transceiver, PLL, SIE, SIL and voltage regulator
• Built-in fully automatic enumeration procedure
• Support suspend mode
− Suspend current requirement
− Wake-up by ISDN (remote) and PC (host)
Other Features
• GCI bus interface (slave mode) for connecting to ISDN U transceiver chip.
• PCM port provides two 64K clear channels to connect to PCM CODEC chips.
• B channel data switching function for selective connection between ISDN/GCI interface, USB and
PCM.
• EEPROM interface for retrieving customized USB device identification data.
• IO pins with LED current drive capability.
• Reset pin for whole-chip reset.
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