1.0 System Description
CN8478/CN8474A/CN8472A/CN8471A
Multichannel Synchronous Communications Controller (MUSYCC™)
Figure 1-3. MUSYCC Application Example—Frame Relay Switch
Frame Relay Network
Control
Data
MPU
PHY
PHY
PHY
PHY
PHY
PHY
PHY
PHY
(Optional)
System Bus – PCM Highway
System Bus – PCM Highway
Tx
Clk, Data,
Sync
Rx
Tx
Clk, Data,
Sync
Rx
Clk, Data,
Sync, OOF
Clk, Data,
Sync, OOF
Physical Layer
Data Link Layer
32-Bit
Address
and Data
Multiplexed
Port 0
Port 1
Port 2
Ch Grp 2
Port 3
Ch Grp 3
Port 4
Port 5
Port 6
Ch Grp 6
Port 7
Ch Grp 0
Ch Grp 5
Ch Grp 7
Ch Grp 1
Ch Grp 4
EBUS
Interface
Serial Port Interface
EBUS
CN8478
Host Interface (PCI)
PCI Bus
PCI Local Bus Bridge
Channel Group 7 Descriptor
System Host
Channel Group 6 Descriptor
Channel Group 5 Descriptor
Channel Group 4 Descriptor
Channel Group 3 Descriptor
Channel Group 2 Descriptor
Channel Group 1 Descriptor
Configuration
Channel Group 0 Descriptor
Tx Channel 31 Message List
Tx Channel ... Message List
Tx Channel 0 Message List
Interrupt
Queue
Rx Channel 31 Message List
Rx Channel ... Message List
Rx Channel 0 Message List
System Memory
8478_003
1-4
Conexant
100660E
CONEXANT [ CONEXANT SYSTEMS, INC ]
