Serial I/O: MPC860P Serial Interface

Serial Communication Controllers (SCC)

The MPC860P has four SCCs which may be configured independently to implement differ- ent protocols. Protocols such as UART, HDLC, and SS7 are supported to varying degrees in the MPC860P.

The choice of protocol is independent of the choice of physical interface. The SCCs do not implement the physical interface. They are connected to the outside world via the serial interface (SI). The SI can route the SCC/SMC outputs directly to the MPC860P external pins, or it can multiplex any combination of SCCs and SMCs together on one or two TDM chan- nels using the time slot assigner.

Each of the internal clocks (RCLK, TCLK) for each SCC can be driven by one of four baud rate generators or one of four external clock pins. These clocks have a top rate of one half of the system clock (20 MHz at 40 MHz).

Serial Management Controllers (SMC)

The MPC860P contains two SMCs configured as UART ports. SMC1 is assigned as the DCE console port A, and SMC2 is assigned as the DCE download port B. The SMC physical inter- face is implemented via the serial interface and time slot assigner, and may also be con- nected to a TDM channel. The clock is driven by either one of four baud rate generators or from an external clock pin.

Time Slot Assigner (TSA)

The TSA allows any combination of SCCs and SMCs to multiplex their data together on either one or two time-division multiplexed (TDM) channels. A TDM is defined as a serial channel which is divided into channels separated by time. Common examples of TDM chan- nels are T1/E1, CEPT, PCM Highway, ISDN Primary Rate, and ISDN Basic Rate (IDL and GCI). You may define your own interface as well.

The serial interface with TSA implements both the internal route selection and, if necessary, time division multiplexing for multiplexed serial channels. The TSA is completely indepen- dent of the protocol used by the SCCs and SMCs. The purpose of the TSA is to route data from the specified pins to the desired SCC or SMC at the correct time. The SCCs and SMCs then handle the data they receive.

The TSA also supports:

•1 or 2 clocks per data bit

•programmable delay (0-3 bits) between frame sync and frame start

•four programmable strobe outputs

•two clock output pins

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PmT1 and PmE1 User’s Manual

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Emerson PMT1, PME1 Serial Communication Controllers SCC, Serial Management Controllers SMC, Time Slot Assigner TSA
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PMT1, PME1 specifications

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