1
1.0 System Description
The Conexant MUSYCC is a high-throughput communications controller for synchronous, link-layer
applications that multiplexes and demultiplexes up to 256 data channels. Each channel can be configured to
support HDLC, Transparent, or SS7 applications. MUSYCC operates at the Layer 2 (the data link protocol
level) reference of the International Organization for Standardization (ISO) Open Systems Interconnection
(OSI). MUSYCC is installed between the multiple serial interface devices and the shared buffer memory of one
or more host processors.
MUSYCC’s serial ports interface to a standard Pulse Code Modulation (PCM) highway, which operates at
T1, E1, 2xE1, or 4xE1 rates. Data can be formatted in the HDLC protocol or left unformatted. The protocol is
specified on a per-channel and direction basis.
An on-device Peripheral Components Interface (PCI) controller, known as the host interface, is provided.
Access to MUSYCC is available through PCI read, write, and configuration cycles (see Figure 1-1).
Figure 1-1. System Block Diagram
Physical
Serial
Interface 0
Interface 0
System
Host
JTAG
Serial
Interface 1
Physical
Interface 1
Local
Bus
Host
Interface
(PCI)
Serial
Interface 2
PCI
Physical
Interface 2
Bridge
System
Memory
Serial
Interface 3
Physical
Interface 3
Serial
Interface 4
Physical
Interface 4
Expansion
Bus
Interface
Optional
Components
Serial
Interface 5
Physical
Interface 5
Local
Host
Serial
Interface 6
Physical
Interface 6
Local
Memory
Serial
Interface 7
Physical
Interface 7
MUSYCC
EBUS
8478_001
100660E
Conexant
1-1
CONEXANT [ CONEXANT SYSTEMS, INC ]
