Motorola MPC823e Reference Manual page 568

Communication Processor Module
16.7.1 Features
The top-level features of the serial interface are the time-slot assigner and NMSI. The
time-slot assigner has the following main features:
• Ability to connect to two independent TDMA channels
• Independent, programmable transmit and receive routing paths
• Independent transmit and receive frame syncs
• Independent transmit and receive clocks
• Selection of rising/falling clock edges for the frame sync and data bits
• Supports 1× and 2× input clocks (1 or 2 clocks per data bit)
• Selectable delay (0–3 bits) between frame sync and frame start
• Eight programmable strobe outputs pins (LST[1:4] are used for receive (RX) RAM while
LST[5:8] are used for transmit (TX) RAM)
• 1- or 8-bit resolution in routing, masking, and strobe selection
• Supports frames up to 8,192 bits long
• Internal routing and strobe selection can be dynamically programmed
• Supports automatic echo and loopback mode for each TDM
The NMSI has the following main features:
• Serial communication controller 2 (SCC2) and each serial management controller
(SMC) can be independently programmed to work with its own set of pins in a
nonmultiplexed manner
• Each serial communication controller can have its own set of modem control pins
• Each serial management controller can have its own set of pins
• The serial communication controllers, universal serial bus, and each serial
management controllers can derive clocks externally from a bank of four clock pins or
a bank of four baud rate generators
16.7.2 Configuring the Time-Slot Assigner
The time-slot assigner implements both internal route selection and time-division
multiplexing for multiplexed serial channels. It supports the serial bus rate and format for
most standard TDM buses, including the T1 and CEPT highways, pulse code modulation
(PCM) highway, and ISDN buses in both basic and primary rates. The two popular ISDN
basic rate buses—interchip digital link and general circuit interface (also known as IOM-2)
are supported.
16-114 MPC823e REFERENCE MANUAL MOTOROLA