W6691CD WINBOND [Winbond], W6691CD Datasheet - Page 18

• Manufacturer Part Number: W6691CD
• Description: ISDN S/T Interface Transceiver
• Manufacturer: WINBOND [Winbond]

6. BLOCK DIAGRAM
The block diagram of W6691 is shown in Figure 6.1
Crystal/Oscillator
(7.68 MHz)
4-wire S/T
GCI Bus
POTS
circuit
FSCO
DCLO
C16.384
Transceiver
Conversion
DPLL1 and Timing Generator
AMI/BIN
Circuit
GCI
Line
&
I/O Control
Fig.6.1 W6691 Functional Block Diagram
2B+D
2B+D
Slip
Buffer
2B+D
18
DPLL2
Controller
HDLC
FIFO
D
GCI Bus
Controller
HDLC
Microprocessor
Interface Circuit
FIFO
B1
Preliminary W6691
B-channel Switching
Publication Release Date: Sep 2001
Controller
HDLC
FIFO
B2
PCM
Port
Revision 1.1
PCM CODEC