w66910 Winbond Electronics Corp America, w66910 Datasheet - Page 15

• Manufacturer Part Number: w66910
• Description: Te Mode Isdn S/t-controller With Microprocessor Interface
• Manufacturer: Winbond Electronics Corp America

Data Sheet
W66910 PCI ISDN S/T-Controller
7. FUNCTIONAL DESCRIPTIONS
7.1 Main Block Functions
The functional block diagram of W66910 is shown in Fig.6.1. The main function blocks are :
- Layer 1 function according to ITU-T I.430
- Serial Interface Bus (SIB)
- B channel switching
- GCI bus interface
- PCM port (x 2) and internal B channel switching
- D channel HDLC controller
- B channel HDLC controllers (x 2)
- Peripheral control
The layer 1 function includes:
- S/T bus transmitter/receiver
- Timing recovery using Digital Phase Locked Loop (DPLL) circuit
- Layer 1 activation/deactivation, TE mode
- D channel access control
- Frame alignment
- Multi-frame synchronization
- Test functions
The serial interface bus performs the multiplexing/demultiplexing of D and 2B channels.
The B channel switching determines the connection between layer 1/GCI, layer 2 and PCM.
The GCI circuit is used to connect a U transceiver (slave mode) or other slave GCI device such as CODEC (master mode).
The PCM port provides two 64 kbps clear channels to connect to PCM codec chips.
The D channel HDLC controller performs the LAPD (Link Access Procedure on the D channel) protocol according to ITU-T
I.441/Q.921 recommendation.
There are two independent B channel HDLC controllers. They can be used to support HDLC-like protocols such as Internet PPP.
Two S/T B channels can also be programmed to 128Kbps mode with one HDLC controller to support IDSL or OCN (in Japan)
application.
In embedded application, a 8-bit microprocessor interface is used to control the chip.
The peripheral control block is used to control other peripheral devices such as CODEC, SLIC, DTMF detector, LEDs.
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Publication Release Date:
Feb,2001
Revision 1.0