GENERAL DESCRIPTION

W6691 consists of one D channel HDLC controller and two B HDLC controller channel access. The HDLC controller facilitates efficient access to signaling, data and voice services. It provides multiplex/non- mutiplexe 8- bit microprocessor interface. The interface is selected by external MBS selection. In addition, W6691 can be operated in TE, LT-S and LT-T mode programmed by external pin. In TE mode, W6691 provides PCM bus or GCI bus to connect with CODEC. In LT mode, it can used in NT2 application.

FEATURES

• Full Duplex 2B+D S/T interface transceiver compliant with ITU I.430 Recommendation

• One D channel HDLC controller

- Maskable address recognition

- Transparent (HDLC) mode

- FIFO buffer (2 * 64)

• Two B channel HDLC controller

- Maskable address recognition

- Transparent (HDLC) mode

- FIFO buffer (2 * 128)

• Various B channel switching capabilities and PCM intercom

• Two PCM CODEC interfaces for speech and POTS application

• GCI interface connects with other peripheral device in TE, LT-S and LT-T mode.

• Multi-frame synchronization

• 8-bits Intel mode or Motorola mode interface accesses B channel and Command/Indication channel.

• The timing clock recovery depends on operating mode.

• DPLL circuit designed in chip for NT2 application.

• Four kind of the extended interrupt trigger mode.

• Two kind of output interrupt polarity selection can be programmed.(Positive level and negative Level)

• Added reset signal to reset other chip.

• Loop back function for testing.

• Layer1 Activate Indication Output can be connected to LED

• Two of programmable timer

• 3.3 Volt power supply

• 3.3 Volt output; Maximum Input is 5.0Volt

• Advanced CMOS technology

• 64 pin LQFP or 68 pin PLCC package