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Chapter 26
Serial Management Controllers (SMCs)
260
260
The two serial management controllers (SMCs) are full-duplex ports that can be conÞgured
independently to support one of three protocols or modesÑUART, transparent, or general-
circuit interface (GCI). Simple UART operation is used to provide a debug/monitor port in
an application, which allows the SCCs to be free for other purposes. The SMC in UART
mode is not as complex as that of the SCC in UART mode. The SMC clock can be derived
from one of the internal baud rate generators or from an external clock signal. However, the
clock should be a 16´ clock.
In totally transparent mode, the SMC can be connected to a TDM channel (such as a T1
line) or directly to its own set of signals. The receive and transmit clocks are derived from
the TDM channel, the internal baud rate generators, or from an external 1´ clock. The
transparent protocol allows the transmitter and receiver to use the external synchronization
signal. The SMC in transparent mode is not as complex as that of the SCC in transparent
mode.
Each SMC supports the C/I and monitor channels of the GCI bus, for which the SMC
connects to a time-division multiplex (TDM) channel in a serial interface (SIx). SMCs
support loopback and echo modes for testing. The SMC receiver and transmitter are
double-buffered, corresponding to an effective FIFO size (latency) of two characters.
Chapter 14, ÒSerial Interface with Time-Slot Assigner,Ó describes GCI interface
conÞguration.
MOTOROLA
Chapter 26. Serial Management Controllers (SMCs)
26-1
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